JETStream TwinForce Series User manual

OPERATION MANUAL
TwinForce™Series Waterblast Unit

Visual Safety System

iii
TwinForce™ Series Waterblast Unit
iii
This manual is copyrighted with all rights reserved. Under copyright laws, this manual may
not be copied in whole or in part or reproduced in any other media without the express written
permission of Jetstream of Houston, LLP or its authorized agent. Permitted copies must carry
the same proprietary and copyright notices as were afxed to the original. Under the law,
copying includes translations, whole or in part, into another language.
Every reasonable effort has been made to ensure that the data given in this document is
accurate, however, the information, gures, illustrations, tables, specications, and schematics
contained herein are subject to change without notice. Jetstream® reserves the right to change
any term, condition or process represented in this document without notice and at Jetstream’s
sole discretion.
©2022 Jetstream of Houston, LLP.
Published in USA
P/N 69098
Jetstream of Houston, LLP
5905 Thomas Road, Houston, TX 77041
[phone] | [phone]
www.waterblast.com
Jetstream®is a registered trademark of Federal Signal Corp.

iv
Operation Manual
iv
WARRANTY
Limited Warranty. Each Waterblast Unit, Bareshaft Pump, and Fluid End manufactured by Jetstream is
warranted against defects in material and workmanship for a period of 12 months or 1,000 hours, provided
it is used in a normal and reasonable manner and in accordance with all operating instructions. If sold to
an end user, the applicable warranty period commences from the date of delivery to the end user. If used for
rental purposes, the applicable warranty period commences from the date of delivery to the party holding the
equipment available for rent. This limited warranty may be enforced by any subsequent transferee during the
warranty period. This limited warranty is the sole and exclusive warranty given by Jetstream.
Exclusive Remedy. Should any warranted product fail during the warranty period, Jetstream will cause to be
repaired or replaced, as Jetstream may elect, any part or parts of such Waterblast Unit, Bareshaft Pump, or
Fluid End that the examination discloses in Jetstream’s sole judgment to be defective in material or factory
workmanship. Repairs or replacements are to be made at Jetstream in Houston, Jetstream FS Solutions Rental
Center, the customer’s location, or at other locations approved by Jetstream. Labor is furnished only when the
unit or part is returned to the factory or when travel and expenses are paid by the purchaser. Freight, travel and
expenses incurred in connection with repair or warranty are excluded from this warranty and shall be paid by
the purchaser. The foregoing remedies shall be the sole and exclusive remedies of any party making a valid
warranty claim.
The Jetstream Limited Warranty shall NOT apply to (and Jetstream shall NOT be responsible for):
1. Major components or trade accessories that have a separate warranty from their original manufacturer,
such as, but not limited to: diesel engines, electric motors, electronic soft starter and/or across the line starter
panels, axles, PTO’s, clutch packs, high pressure gauges, high pressure hoses, ex lances, etc.
2. Normal adjustments and maintenance services.
3. Normal wear parts such as, but not limited to: oil, clutches, belts, lters, packing, cartridges, univalves, face
seals, diffusers, gland nut bushings, plungers, nozzles, rupture disks, etc.
4. Failures resulting from the machine being operated in a manner or for a purpose not recommended by
Jetstream including failures or malfunctions resulting from corrosion, misapplication, overpressurization,
inadequate pump suction conditions, improper water quality, improper maintenance, or misuse.
5. Repairs, modications or alterations which in Jetstream’s sole judgment, have adversely affected the
machine’s stability, operation or reliability as originally designed and manufactured.
6. Items subject to misuse, negligence, accident or improper maintenance.
*NOTE* The use of any part other than ones approved by Jetstream may invalidate this warranty. Jetstream
reserves the right to determine, in its sole discretion, if the use of non-approved parts invalidates the warranty.
Nothing contained in this warranty shall make Jetstream liable for loss, injury, or damage of any kind to any
person or entity resulting from any defect or failure in the machine or part.
THIS WARRANTY IS, AND SHALL BE IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
WITHOUT LIMITATION, ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE,
ALL OF WHICH ARE DISCLAIMED. THIS DISCLAIMER AND EXCLUSION SHALL APPLY EVEN IF ANY WARRANTY
POSSIBLY ASSERTED FAILS OF ITS ESSENTIAL PURPOSE.
This warranty is in lieu of all other obligations or liabilities, contractual and otherwise, on the part of Jetstream.
For the avoidance of doubt, Jetstream shall not be liable for any indirect, special, incidental or consequential
damages, including, but not limited to, loss of use or lost prots. Jetstream makes no representation
that the unit has the capacity to perform any functions other than as contained in Jetstream’s written
literature, catalogs or specications accompanying delivery of the machine. No person or afliated company
representative is authorized to alter the terms of this warranty, to give any other warranties or to assume
any other liability on behalf of Jetstream in connection with the sale, servicing or repair of any machine
manufactured by Jetstream. Any legal action based hereon must be commenced within eighteen (18) months
of the event or facts giving rise to such action.
Jetstream reserves the right to make design changes or improvements in its products without
imposing any obligation upon itself to change or improve previously manufactured products.

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TwinForce™ Series Waterblast Unit
TABLE OF CONTENTS
WATERBLAST SAFETY..................................................................................................................................................................................................................................................... 1
Recognizing Safety Information ................................................................................................................................................................................................................1
Understanding Signal Words...............................................................................................................................................................................................................1
Waterblast Safety Manual...............................................................................................................................................................................................................................1
Understanding Safety Decals..................................................................................................................................................................................................................... 2
General Safety Precautions .......................................................................................................................................................................................................................... 4
Read Instructions ......................................................................................................................................................................................................................................... 4
Inspect Equipment...................................................................................................................................................................................................................................... 4
Check Pressure Ratings .......................................................................................................................................................................................................................... 4
Rupture Discs................................................................................................................................................................................................................................................... 4
Check Connections...................................................................................................................................................................................................................................... 4
Tighten Connections.................................................................................................................................................................................................................................. 4
Use Two Operators........................................................................................................................................................................................................................................ 4
Purge the System.......................................................................................................................................................................................................................................... 5
Test the System.............................................................................................................................................................................................................................................. 5
Slowly Increase Pressure........................................................................................................................................................................................................................ 5
Use the Minimum Pressure Required......................................................................................................................................................................................... 5
Be Prepared......................................................................................................................................................................................................................................................... 5
Performing Maintenance or Repairs ............................................................................................................................................................................................ 5
Freezing Conditions.................................................................................................................................................................................................................................... 5
Store Components Properly ................................................................................................................................................................................................................. 5
Long Term Storage........................................................................................................................................................................................................................................ 5
Trailer Safety.............................................................................................................................................................................................................................................................. 6
Tires and Rims................................................................................................................................................................................................................................................. 6
Avoid Unit Instability................................................................................................................................................................................................................................. 6
Check Lighting................................................................................................................................................................................................................................................. 6
Check Brake Systems................................................................................................................................................................................................................................ 6
Breakaway System....................................................................................................................................................................................................................................... 6
Trailer Hitch........................................................................................................................................................................................................................................................ 6
Safety Chains.................................................................................................................................................................................................................................................... 6
COMPONENT IDENTIFICATION.................................................................................................................................................................................................................................7
Engine...................................................................................................................................................................................................................................................................... 7
Clutch and PTO................................................................................................................................................................................................................................................. 7
Belt Drive ...............................................................................................................................................................................................................................................................7
UNx™ Pump..........................................................................................................................................................................................................................................................7
Inlet Water Filtration...................................................................................................................................................................................................................................7
Manifold................................................................................................................................................................................................................................................................ 8
Water Lubrication System..................................................................................................................................................................................................................... 8
Pressure Gauge............................................................................................................................................................................................................................................... 8
Hydro-Throttle Switch (Optional) .................................................................................................................................................................................................... 9
Bypass Valve...................................................................................................................................................................................................................................................... 9
Regulator Valve (Not Shown)............................................................................................................................................................................................................... 9
Discharge Fitting......................................................................................................................................................................................................................................... 10
Supply Couplings........................................................................................................................................................................................................................................ 10
Control Panels................................................................................................................................................................................................................................................ 10
Water Inlet........................................................................................................................................................................................................................................................... 11

vi
Operation Manual
Bypass Drain.....................................................................................................................................................................................................................................................11
Fuel System...................................................................................................................................................................................................................................................... 12
Batteries.............................................................................................................................................................................................................................................................. 12
Charge Pump (40K Units).................................................................................................................................................................................................................... 13
Fluid End and Unit Identication ................................................................................................................................................................................................. 13
TRAILER UNITS.................................................................................................................................................................................................................................................................. 15
Trailer Components............................................................................................................................................................................................................................................15
Fire Extinguisher (Optional) ...............................................................................................................................................................................................................15
Spare Tire (Optional) .................................................................................................................................................................................................................................15
Jack Stand..........................................................................................................................................................................................................................................................15
Adjustable Ball Hitch................................................................................................................................................................................................................................15
Safety Chains...................................................................................................................................................................................................................................................15
Electrical Connector ................................................................................................................................................................................................................................. 16
Ground Cable (Optional) ....................................................................................................................................................................................................................... 16
Document Holder (Optional)............................................................................................................................................................................................................. 16
Lighting And Reectors .................................................................................................................................................................................................................................. 17
Front and Side Lights and Reectors......................................................................................................................................................................................... 17
Rear Lights and Reectors...................................................................................................................................................................................................................17
Trailer Breakaway System............................................................................................................................................................................................................................ 18
Activating the System............................................................................................................................................................................................................................. 18
CONTROL PANEL .............................................................................................................................................................................................................................................................. 19
Jetstream Connections................................................................................................................................................................................................................................. 20
Jetstream 3000/3600/4200Bareshaft Pump InstallationGuidelines .................................................................................................................. 21
Models.................................................................................................................................................................................................................................................................. 21
Water Supply................................................................................................................................................................................................................................................... 21
Pulsation ............................................................................................................................................................................................................................................................ 21
Lubrication....................................................................................................................................................................................................................................................... 22
Jetstream 5200Bareshaft Pump InstallationGuidelines................................................................................................................................................. 23
Water Supply.................................................................................................................................................................................................................................................. 23
Rod Box............................................................................................................................................................................................................................................................... 23
Side Bypass..................................................................................................................................................................................................................................................... 23
Technical Notes............................................................................................................................................................................................................................................ 24
OPERATION .........................................................................................................................................................................................................................................................................25
Preparing the Unit ............................................................................................................................................................................................................................................. 25
Recommended Equipment........................................................................................................................................................................................................................ 26
Hose and Water Supply Requirements............................................................................................................................................................................................ 26
Start-up Preparation........................................................................................................................................................................................................................................ 26
Starting the Unit.................................................................................................................................................................................................................................................. 27
Flushing the System.......................................................................................................................................................................................................................................28
Checking the Water Lubrication System.......................................................................................................................................................................................29
Raising System Pressure............................................................................................................................................................................................................................. 30
Breaking in New Packing.............................................................................................................................................................................................................................. 31
Using the Hydro-Throttle (Dump System Only) ........................................................................................................................................................................ 31
Monitoring Weep Holes................................................................................................................................................................................................................................. 32
Pressure Controls............................................................................................................................................................................................................................................... 33
Stopping the Unit............................................................................................................................................................................................................................................... 33

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TwinForce™ Series Waterblast Unit
MAINTENANCE.................................................................................................................................................................................................................................................................35
Unit Maintenance.............................................................................................................................................................................................................................................. 35
Daily....................................................................................................................................................................................................................................................................... 35
50 Hours............................................................................................................................................................................................................................................................. 35
100 Hours........................................................................................................................................................................................................................................................... 35
500 Hours ......................................................................................................................................................................................................................................................... 35
Winterizing The Unit........................................................................................................................................................................................................................................ 36
Trailer Maintenance ......................................................................................................................................................................................................................................... 38
Tires .......................................................................................................................................................................................................................................................................38
Wheel Bearings ........................................................................................................................................................................................................................................... 38
Lug Nuts.............................................................................................................................................................................................................................................................38
Axles ...................................................................................................................................................................................................................................................................... 39
Trailer Breakaway System...........................................................................................................................................................................................................................39
System Check................................................................................................................................................................................................................................................ 39
WATER AND FILTRATION............................................................................................................................................................................................................................................ 41
Water Quality Requirements ......................................................................................................................................................................................................................41
Filter Inspection.......................................................................................................................................................................................................................................... 42
Secondary Filter (40k Operation Only).....................................................................................................................................................................................42
Filter Cartridge Replacement...........................................................................................................................................................................................................43
Switch Adjustment ................................................................................................................................................................................................................................. 43
Uni-Valve Life ................................................................................................................................................................................................................................................. 43
PRESSURE CONVERSION.........................................................................................................................................................................................................................................45
Converting a Pump........................................................................................................................................................................................................................................... 45
40K Hose Connections ......................................................................................................................................................................................................................... 52
SERVICE ................................................................................................................................................................................................................................................................................53
Fluid End.................................................................................................................................................................................................................................................................... 53
Checking Manifold Bolt Torque...................................................................................................................................................................................................... 53
Rupture Disc Inspection ...................................................................................................................................................................................................................... 54
Packing Replacement ............................................................................................................................................................................................................................ 54
Uni-Valve Service........................................................................................................................................................................................................................................ 60
40K Face Seal Replacement............................................................................................................................................................................................................... 61
15K, 20K Uni-Valve Service.................................................................................................................................................................................................................. 63
40K Uni-Valve Service..............................................................................................................................................................................................................................67
Bypass Valve Cartridge Replacement......................................................................................................................................................................................... 71
Power End...................................................................................................................................................................................................................................................................72
Checking Power End Oil Level...........................................................................................................................................................................................................72
Changing the Power End Oil...............................................................................................................................................................................................................73
Checking PTO Oil level.............................................................................................................................................................................................................................73
Changing PTO Oil......................................................................................................................................................................................................................................... 74
Checking Belt Tension ............................................................................................................................................................................................................................74
Adjusting Belt Tension ........................................................................................................................................................................................................................... 75
Replacing the Belts ...................................................................................................................................................................................................................................75
Charge Pump...................................................................................................................................................................................................................................................76
Crosshead Pony Rod Seals.................................................................................................................................................................................................................. 77
Rod Journal Bearings.............................................................................................................................................................................................................................. 80
Crosshead and Connecting Rod Assembly.......................................................................................................................................................................... 84
UNx Pump.........................................................................................................................................................................................................................................................86

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Operation Manual
Scan or click
the QR Code for
more product
information.
Crankshaft ......................................................................................................................................................................................................................................................88
TROUBLESHOOTING..................................................................................................................................................................................................................................................... 93
TRAINING..............................................................................................................................................................................................................................................................................95
Safety Training...................................................................................................................................................................................................................................................... 95
New Start-up Training .................................................................................................................................................................................................................................... 95
FS Solutions Training...................................................................................................................................................................................................................................... 95
Additional Training Opportunities....................................................................................................................................................................................................... 95
APPENDIX A: TECHNICAL SPECIFICATIONS .............................................................................................................................................................................................. A-1
General Unit Information ............................................................................................................................................................................................................................A-1
APPENDIX B: LONG TERM STORAGE PROCEDURE..............................................................................................................................................................................B-1
INDEX.........................................................................................................................................................................................................................................................................INDEX-1

1
TwinForce™ Series Waterblast Unit
WATERBLAST SAFETY
Recognizing Safety Information
One of Jetstream’s ongoing endeavors is to
minimize or elminate the risk of injury to the
product user. Jetstream has taken every ef-
fort to alert the user to potential safety risks
through the use of cautionary statements wi
thin the operator manual and safety decals
(Figure 1) on its products. Be sure to take the
time to identify and understand these noti-
cations wherever they may be.
Always follow recommended precautions and
safe operating practices.
Understanding Signal Words
This is the safety-alert symbol. When you
see this symbol on your unit or in this manual,
be alert to the potential for personal injury. The
safety-alert symbol is often used in conjunc-
tion with signal words.
A signal word – DANGER, WARNING, or CAUTION –
is used with the safety-alert symbol. DANGER
identies the most serious hazards.
This symbol and these signal words appear on
the unit and in this manual. Read and under-
stand the following denitions of the signal
words before operating or working on the unit.
Danger is used to indicate the presence of
a hazard which WILL cause severe physical
injury or death if proper precautions are not
taken.
Warning is used to indicate the presence of
a hazard which MAY cause serious physi-
cal injury or death, and can result in serious
property damange if proper precautions are
not taken.
Caution is used to indicate the presence of a
hazard which MAY cause some physical injury
or property damage if proper precautions are
not taken.
!!
DANGER
!!
WARNING
!!
!!CAUTION
Attention indicates installation, operation, or
maintenance information which is important
but is not considered a hazard.
Waterblast Safety Manual
A safety manual is shipped with
each unit. It provides guidelines
and instructions for maintaining a
safe work environment while using
and maintaining waterblast equip-
ment.
All operators and maintenance personnel
should read and understand the content of
this manual to help maintain a safe work
environment.
Contact Jetstream for additional copies of the
safety manual.
ATTENTION
ATTENTION
The Waterblast safety manual should be kept with
the unit at all times
!!WARNING: Breathing diesel engine ex-
haust exposes you to chemicals known
to the State of California to cause cancer
and birth defects or
other reproductive harm.
• Always start and operate the engine in
a well-ventilated area.
• If in an enclosed area, vent the ex-
haust to the outside.
• Do not modify or tamper with the ex-
haust system.
• Do not idle the engine except as nec-
essary.
For more information go to
www.P65warnings.ca.gov/diesel.

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Operation Manual
Understanding Safety Decals
The following illustrations show common locations for safety decals. Decals and their locations
may vary for different units. Always be familiar with the location and content of all safety decals
on any Jetstream unit.
Figure 1: Example of Safety Decals

3
TwinForce™ Series Waterblast Unit

4
Operation Manual
General Safety Precautions
Read Instructions
Read and follow all the manufacturer’s instruc-
tions prior to using any waterblast product. Con-
tact the manufacturer if unsure of any details.
Further instructions for safe operation are
located in the Jetstream Safety Manual. Read
this manual before operating the equipment.
Inspect Equipment
Inspect the condition of all components prior
to use. Do not use any item that is in suspect
condition. If unsure about the condition of a
component, ask a supervisor or maintenance
personnel for instructions. Use only compo-
nents that are marked with a recommended
operating pressure. Never exceed the operat-
ing pressure of the weakest component in the
system.
Check Pressure Ratings
All components in the
system must be properly
rated for the intended
operating pressure. Refer
to the Safety Manual for
more information on
pressure ratings.
Rupture Discs
Installation of two rupture discs is necessary
to protect the pump and operators.
• Rupture disc ratings: one at 120% of oper-
ating pressure, one at 140% of operating
pressure
Check Connections
Check the condition of the connection threads
prior to making any high pressure connection.
For 15,000 psi (1000 bar) and lower pressures
use at least four wraps of Teon tape on male
pipe (NPT) threads for sealing purposes. Do
not allow any tape to overlap the end of the
tting. Tape fragments may enter the system’s
water stream and clog the nozzle’s orices.
Apply a coat of anti-seize compound over the
Teon sealant to prevent “galling” or seizing
of threads. For “Jetstream® 20K”; “type M”; “MP
(20K)” & HP (40K)” connections use anti-seize
compound on the threads and the male cone.
Tighten Connections
Properly tighten all high pressure connections.
Hand-tighten pipe (NPT) ttings and then
wrevolutions. Do not exceed two revolutions
on NPT threaded connections.
Use caution when using a pipe wrench. Pipe
wrenches can cause deep scoring leading to
weakened components.
Refer to the Technical sections in the 15K, 20K
and 40K catalogs or at the following web page
for more information and torque specica-
tions for the various ttings used on these
units.
https://waterblast.com/new-catalogs
Use Two Operators
Use at least two operators when waterblast-
ing. The primary operator handling the clean-
ing device must maintain control of the water
discharge at all times. The secondary operator
controlling the waterblast unit must be posi-
tioned a safe distance of at least 12 ft. (3.7 m)
from the blast operation.
Figure 2: Pressure Rating Markings
Figure 3: Rupture Discs
Figure 4: Primary and Secondary Equipment Operators

5
TwinForce™ Series Waterblast Unit
Purge the System
Before attaching a nozzle to the control gun or
tube cleaning lance, operate the pump at low
speed to purge dirt and debris from the sys-
tem. Dirt and debris can clog nozzle orice(s)
and cause excessive system pressures.
Test the System
With the nozzle installed, operate the pump at
low speed (low pressure) to test the system.
Should system repairs or adjustments be
necessary, stop the pump and relieve all pres-
sure before performing any required repairs or
adjustments.
Slowly Increase Pressure
Visually inspect all ttings for leaks at 1000
psi (69 bar), and then again once the system
reaches full pressure. Do not use your hand to
nd leaks. If leaks are evident, turn the sys-
tem off and relieve the pressure. Remove the
leaking tting, clean and inspect. If the tting
looks undamaged, re-install the tting. If the
leak persists, the tting must be replaced.
Leaking ttings can cause tting damage and
very dangerous injection wounds.
With the system operating properly, slowly
increase pump speed until operating pressure
is reached.
Use the Minimum Pressure Required
Do not exceed the operating pressure of the
system’s lowest pressure-rated component.
Use of lower pressure-rated components in a
system should be avoided if possible. Com-
ponents with a lower pressure rating can be
overlooked and explode if vigilance is not
maintained. Keep equipment pressure rating
and warning tags intact.
Be Prepared
If equipment malfunctions or a malfunction
is suspected, immediately stop the cleaning
activity and relieve the pressure in the system
before attempting any repair. Always follow
manufacturer’s repair instructions.
Performing Maintenance or Repairs
Because of the hazards involved with water
blasting, maintenance or repairs may only be
performed by service personnel that are prop-
erly trained to maintain this equipment. Train-
ing is available through Jetstream®and can be
requested from the Jetstream website (www.
waterblast.com) or FS Solutions rental centers.
Following repairs or maintenance, operate the
system at low pressure to test the system. Ad-
just the pressure slowly during operation.
Freezing Conditions
After shutting down in freezing conditions,
even for brief periods, drain the water from all
components. Prior to starting the equipment
after a freeze, the operation of all equipment
components must be checked carefully to
ensure they are not frozen, or cracked, and are
still in safe operating condition.
Refer to”Winterizing the Unit” on page 36
for details.
Store Components Properly
Properly store components to protect from
damage when not in use. Ensure all warning
tags and markers remain intact for the next
usage.
Long Term Storage
Refer to Appendix B: LONG TERM STORAGE
PROCEDURE.
Figure 5: Purging the System

6
Operation Manual
Trailer Safety
Tires and Rims
An inated tire and rim can be very dangerous
if improperly used, serviced or maintained. To
avoid serious injury, never attempt to re-in-
ate a tire which has been run at or seriously
under-inated without rst breaking down
the tire and wheel assembly for inspection. Do
not attempt to add air to tires or replace tires
or wheels without rst taking precautions to
protect persons and property. For details, see
the regulations of the Occupational Safety and
Health Administration (OSHA).
Avoid Unit Instability
Park the trailer or skid on hard, level ground.
Use the trailer jack to level the trailer. Use
wheel chocks to secure the trailer in place.
Check Lighting
Before towing the trailer, verify that all light-
ing and reectors are in proper working order.
Repair any damaged lights or reectors.
Check Brake Systems
The Jetstream trailer is equipped with electric
brakes. Before towing the trailer, verify that the
trailer brakes are working properly.
Breakaway System
Jetstream trailers are equipped with break-
away brake systems to stop the trailer should
it become disconnected from the tow vehicle
while being towed. Verify the systems are oper-
ating properly before towing the trailer.
Install the breakaway cable on the tow vehicle
before travel.
Trailer Hitch
Inspect the trailer hitch before travel. Ensure
the hitch is not damaged. If the hitch is ad-
justable, adjust the hitch to keep the trailer
level during travel. The torsion axles do not
distribute the load so it is extremely impor-
tant to tow the trailer level to maintain even
tire loads. When installing on the tow vehicle,
ensure the hitch is properly locked onto the
hitch ball.
Safety Chains
Safety chains keep the trailer connected to
the tow vehicle in the event of a hitch failure.
Connect the trailer’s safety chains to the tow
vehicle before towing the trailer.
Figure 7: Trailer Hitch Assembly.
Electrical Connections
Safety Chains
Figure 6: Wheel Chocks

7
TwinForce™ Series Waterblast Unit
COMPONENT IDENTIFICATION
Before operating the unit it is necessary to fully understand each component and how it functions.
Following is a brief description of the main components of the TwinForce unit.
Engine
The engine is the source of power to drive
the pump. Available engine options provide a
power range of 325-400 HP (243-298 kW) in
single unit conguration or 650-800 HP (485-
597 kW) in dual unit conguration.
Clutch and PTO
The clutch, through use of a lever on top, pro-
vides the means to engage and disengage the
clutch. When engaged, power is transmitted
from the engine to the pump via the power
take off (PTO) and belt drive. The PTO contains a
shaft that rotates on bearings
Belt Drive
The belt drive is driven by the PTO. A pulley is
mounted on the PTO shaft and, when engaged,
drives the other pulley to operate the pump.
UNx™Pump
The UNx pump uses the power from the engine
to pressurize the source water into high pres-
sure output. The pump is separated into two
sections, the power end and the uid end.
The power end contains the components that
drive the pump. It is also referred to as the
“crank end” because it contains a crankshaft.
The uid end contains the components that de-
termine the output pressure of the pump. The
operator may change the output pressure and
ow of the pump by changing the components
in the uid end. The uid end is also referred
to as the “wet” end as this is where the water
travels in and out of the pump.
Refer to the pressure specic catalogs (15K,
20K and 40K) for detailed exploded views and
component part numbers for the uid and
power ends. The catalogs are available at the
following website:
https://waterblast.com/new-catalogs
Inlet Water Filtration
Each pump has an associated dual water
ltration package. Inlet water travels from the
Figure 8: TwinForce Series Waterblast Unit
Engine
UNx
Pump
Clutch & PTO
Belt Drive
Fuel Tank Water Filters

8
Operation Manual
charge pump into the rst lter and then the
second lter in line. A ball valve is tted to the
inlet side of the lter after the charge pump.
This is used when the associated pump will
not be used, but there is water supply due to
use of the opposite triplex pump.
Manifold
The manifold houses many of the components
that make up the uid end of the pump in-
cluding the uni-valves. The three uni-valves
each consist of a suction and discharge valve
combined into one assembly. The valves con-
vert low pressure water to high pressure water.
.Manifold Drain Valve
The manifold drain valve allows the manifold
to be ushed of contaminants prior to pump
usage. It is also used to purge air during op-
eration start up.
Water Lubrication System
The water lubrication system provides water
to the packing in the pump. The water lubri-
cates and cools for optimum operation of the
pump. The system includes a manifold and
three water lines. Needle valves are present
on manifolds that are pressure fed (all 40K
units). The needle valves control the amount of
ow to each stufng box and must be prop-
erly adjusted during operation. Manifolds that
are not pressure fed have a xed ow. Refer to
“Charge Pump (40K Units)” on page 13 for
more information on pressure fed manifolds.
Pressure Gauge
The liquid lled pressure gauge allows the
operator controlling the pump to monitor the
pressure of the system.
Pressure Gauge
Hydro-Throttle
Switch
Water Lubrication
System
Manifold
Drain Valve Manifold
Rupture Discs
Figure 9: Pump Components
Figure 10: Water Filter Housings

9
TwinForce™ Series Waterblast Unit
Hydro-Throttle Switch (Optional)
The hydro-throttle switch senses the pressure
within the pump and allows the engine to idle
when the operator is not blasting.
Refer to “Using the Hydro-Throttle (Dump Sys-
tem Only)” on page 31.
Rupture Discs
Two rupture discs are used in the system. The
rupture discs provide protection from excess
pressure in the system. If system pressure
were to exceed the rated pressure of the discs,
the discs would burst. If a disc bursts, water
will ow through the ruptured disc to provide
relief for the system and protect components
from excess pressure. Check the discs before
operating the pump. Keep a supply of rupture
discs on hand for use. If a rupture disc should
burst, there is no way to build pressure until
the disc is replaced. Use only genuine Jet-
stream rupture discs properly rated for the
intended operating pressure.
Bypass Valve
The bypass valve controls the pump pressure
by bleeding off excess water and diffusing it to
low pressure. Turning the knob allows the op-
erator to adjust pressure during operation and
relieve pressure when not waterblasting.
The bypass valve controls pressure by allowing
water to bypass though the valve. A discharge
hose is attached to the bypass valve. The hose
extends to the other side of the unit where it is
attached to a drain elbow. Water that bypasses
the valve will drain from the bypass drain
throughout operation.
The proper use of the bypass valve is to install
the correct size nozzle in the system so that
the bypass valve can be closed during opera-
tion. A combination of plunger size, engine
rpm, and nozzle will allow the bypass valve to
close at almost all ow rates.
Note: For units employing a shut in sys-
tem, a regulator valve is substi-
tuted for a bypass valve.
Regulator Valve (Not Shown)
For shut-in systems (where no low pressure
water dumps from the gun), the bypass valve
is replaced with a regulator valve. The regu-
lator maintains constant system pressure
Discharge Fitting
Supply
Couplings
Bypass Valve
Figure 11: Pump Components (continued)

10
Operation Manual
when operating one or more shut-in devices.
When a gun or other device is disengaged,
the regulator automatically adjusts to shift
the excess ow to a low pressure outlet while
maintaining system pressure. Because shut-in
systems maintain constant system pressure,
the hydro-throttle does not function in these
applications.
Discharge Fitting
The discharge tting allows the connection of
a high pressure hose. High pressure water ex-
its from this tting. On 15K manifolds, a quick
disconnect is recommended to prevent galling
of pipe threads and damage to the manifold.
Supply Couplings
The supply couplings provide a quick method
for attaching the supply hose to the manifold.
Control Panels
Twin Force units come equipped with a total of
4 control panels. The associated panels are ei-
ther marked with a “1” or a “2” (Figure 12). Two
control panels are able to control and monitor
a single engine, although only one of each pair
is able to start with key. The “Near Side” Panel
has the key and toggle switches, and the “Far
Side” panel does not have the key and switch-
es. These panels are linked together, but any
parameter that is manually changed in one of
the pair, will need to be also set in the alter-
nate control panel. Detail on accessing menus
and parameters can be found in the control
panel manuals that come with the unit.
Each end of the tether cable connecting two
panels for control of the same engine is iden-
tied as “Near Side” or “Far Side”. This desig-
nates which panel that particular end should
connect to.
Figure 12: Control Panels

11
TwinForce™ Series Waterblast Unit
Water Inlet
The inlet water connection (Figure 13) is a 2”
Camlok Nipple. The inlet regulator is adjust-
able and pressure to the uid end should not
exceed 75 psi.
Bypass Drain
The bypass drain is connected to the bypass
valve. Water will drain from the hose onto the
ground during pump operation as explained
in “Secondary Filter (40K Units)” on page
11. This hose can be plumbed to an alter-
nate drain or tank for collection if required. If
bypass drain water needs to be routed to a dif-
ferent location, contact Jetstream engineering
for assistance.
Secondary Filter (40K Units)
A secondary lter (Figure 14) is mounted on
top of the pump for use when operating at
“40K”. The lter is not connected during 15K or
20K operation.
A pressure gauge is mounted on the lter to
monitor pressure in the lter.
A differential pressure switch is mounted
in the lter circuit to monitor proper ow
through the lter. If the lter becomes plugged
and ow is insufcient, the switch will cause
the engine to shut off. “Emergency Stop” will
be displayed on the control panel.
A drain valve is located on the lter cover that
allows the operator to purge air from the lter
at startup.
!!CAUTION
If a bypass discharge hose is used, the hose
must be properly sized to prevent excessive
backpressure. Excess backpressure can cause
vibration and pulsation in the system leading to
damaged system components.
Figure 13: Water Inlet
Figure 14: Secondary Filter

12
Operation Manual
Fuel System
The unit houses two 125 gallon fuel tanks
(Figure 15) with mechanical oat valve gauges.
Fuel sender mounting ange is standard op-
tion. The tanks are used SEPARATELY and each
has to be lled separately for use with its as-
sociated engine.
The fuel tank caps are vented and lockable.
Keys are supplied with original shipment of
the unit.
Batteries
Two 12 volt lead acid batteries wired in paral-
lel (12V) are located in between the belt drive
and the fuel tank (Figure 16). The batteries and
connections are contained in two rain proof
containers.
Batteries
Figure 15: Fuel Tanks
Figure 16: Batteries