Holmatro DPU31 User manual

DPU31/SPU16
Owner’s Manual: Part No. 918.269.296 001

2
All rights reserved. You are prohibited from copying or reproducing this manual, any
materials contained herein or any portion hereof in any manner whatsoever without the
express prior written consent of Holmatro.
Holmatro reserves the right to change the contents of this manual at any time without prior
notice. Holmatro also reserves the right to change any part or component of any machine
referenced in this manual at any time without prior notice.
This manual is intended for use solely with the basic version of each piece of equipment and
each product referenced and should not be used in connection with any modified, altered or
adapted version of any piece of equipment without the express prior written consent of
Holmatro.
Additional information on adjustments, maintenance and repair of any product contained
herein will be provided upon written request of the technical department of your supplier. If
not provided, contact Holmatro directly.
EXCEPT AS EXPRESSLY SET FORTH ON THE ENCLOSED WARRANTY CARD,
HOLMATRO MAKES NO OTHER WARRANTY OR REPRESENTATION, EITHER
EXPRESS OR IMPLIED, WITH RESPECT TO THE STATEMENTS CONTAINED
HEREIN. HOLMATRO HEREBY EXCLUDES ANY AND ALL IMPLIED
WARRANTIES, INCLUDING WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE.
IN NO EVENT WILL HOLMATRO BE LIABLE FOR DIRECT, INDIRECT,
SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF
USE OF THIS MANUAL OR ANY STATEMENTS CONTAINED THEREIN.
SOME STATES DO NOT ALLOW THE EXCLUSION OF IMPLIED WARRANTIES
OR LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE
ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU.
IF ANY PROVISION CONTAINED HEREIN SHALL BE UNLAWFUL, VOID OR
FOR ANY REASON UNENFORCEABLE, THEN THAT PROVISION SHALL BE
SEVERED FROM THE STATEMENT AND SHALL NOT AFFECT THE VALIDITY
AND ENFORCEABILITY OF THE REMAINING STATEMENTS CONTAINED
HEREIN.

3
1. Introduction
We congratulate you on this purchase. Be sure to read and understand this user manual before using the
tool. This user manual covers the basic aspects for the safe use and operation of this equipment.
First of all check that your equipment is complete and undamaged. Notify your Holmatro dealer
immediately if the equipment is damaged or incomplete, and do not use the equipment.
The equipment is designed for use by professional, fully trained fire and rescue personnel.
This pump is suitable only for operating double-acting hydraulic rescue equipment with mineral oil
hydraulic fluid to an allowable pressure of 720 bar (10,500 psi). These pumps come with Core™
Technology as standard.
Follow these instructions to ensure your safety and to keep your equipment in good condition.
2. Safety Symbols
THIS IS THE SAFETY ALERT SYMBOL. IT IS USED TO ALERT YOU TO
POTENTIAL PERSONAL INJURY HAZARDS. OBEY ALL SAFETY
MESSAGES THAT FOLLOW THIS SYMBOL TO AVOID POSSIBLE INJURY
OR DEATH.
DANGER indicates an imminently hazardous situation
which, if not avoided, will result in death or serious
injury.
WARNING indicates a potentially hazardous situation
which, if not avoided, could result in death or serious
injury.
CAUTION indicates a potentially hazardous situation
which, if not avoided, may result in minor or moderate
injury.
CAUTION used without the safety alert symbol indicates a
potentially hazardous situation which, if not avoided, may
result in property damage

4
3. Safety Instructions
Study these instructions carefully before operating this
equipment.
* Never use a Core™ Technology product with a Twin-line hose product.
* Use this equipment only for jobs for which it is designed. If in doubt or not clear, be sure to consult
your Holmatro dealer.
* Always wear personal protection equipment such as safety goggles, helmet, gloves, protective
clothing and safety shoes.
* Keep spectators at sufficient distance.
* In the event of oil leakage, stop immediately and consult the troubleshooting list.
* In the event of unfamiliar noise, vibration or other unusual behavior, stop immediately and consult
your Holmatro dealer.
* The equipment must only be operated with non-toxic mineral base hydraulic oil distributed by
Holmatro.
* Use only original Holmatro accessories and parts.
* Observe the maintenance instructions.
* Only trained service technicians, certified by Holmatro, are allowed to repair this equipment.
* Replace safety symbols / pictograms and / or information labels if worn, illegible, damaged or
removed.
* Always place the pump on a stable firm base which is free of protrusions or loose matter (gravel,
dust)
* Use the pump at a minimum distance of 3 feet (1 metre) from buildings/structures.
* Never use the pump in an enclosed space and always ensure sufficient ventilation.
* Never inhale the exhaust gas. It contains Carbon Monoxide, a colorless and odorless gas which can
cause loss of consciousness or death.
* Keep the exhaust discharge free of foreign objects.
* Never refill fuel when the engine is running.
* Never refill or even use near open fire.
* Fill the fuel tank to the sight glass level. Never overfill.
* Remove fuel spillage before starting the engine.
* Never lift the pump with chains or steel wire ropes on the carrying handle.
* The vehicle or object must be stabilized before beginning any extrication technique.
* Never use the relief device tool on pressurized hoses, valve blocks, or rescue tools that are attached to
an operating power unit. The pressure relief device is designed for use only on hoses that are
disconnected from the pump unit. (See section 7.2.3)
4 Operation
The pump is a Personal Power
®
pump. The compact design and light weight make it easy for one
person to carry. The DPU31 runs a two-stage axial piston pump that can build up a maximum
pressure of 720 bar (10,500 psi), and can run two rescue tools at the same time. The SPU16 runs a
three-stage axial piston pump that can build up a maximum pressure of 720 bar (10,500 psi). The
SPU16 runs one tool only.

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5. Description: Model DPU31.
5.1 Product identification.
5.2 Technical specifications
Pump:
Allowable operating pressure : 10,500 psi (720 bar)
Hydraulic oil contents : 2.90 qt (2740 cc)
Usable hydraulic oil contents : 2.74 qt. (2590 cc)
Dimensions (LxWxH) : 23
5/8” x 11 7/16” x 16 ¾” (600 x 290 x 425 mm)
Weight, ready for use (Core™) : 55 lbs. (25 kg)
Temperature range : -4 °F to +176 ºF -20 °C to +80 ºC
Engine:
Engine model : Honda GX100
Engine type : 4-stroke, overhead camshaft, single cylinder
Displacement : 6.0 cu-in. (98cc)
Engine speed : 4550 rpm (with Eco Throttle™ switch off)
3000 – 4550 rpm (with Eco Throttle™ switch on)
Engine oil capacity : 0.42 qt. (400 cc)
Fuel tank capacity : 1.32 qt. (1250 cc)
Fuel : Unleaded gasoline, Octane 86 or higher.
Cooling system : Forced air
Ignition system : Full transistor
Spark plug : CR5HSB (NGK)
DE
F
C
AB
P
QG
I
I
H
J
N
OLK KM
A. Fuel tank cap vent lever G. Hydraulic oil level indicator M. Recoil starter
B. Hydraulic oil fill cap H. Fuel level indicator N. Engine on/off switch
C. Fuel cap I. Bypass valve O. ECO switch
D. Carrying handle J. LED indicator panel P. Maintenance cover
E. Spark plug service cover K. Core™ couplers (female) Q. Choke
F. Muffler L. Hydraulic oil drain plug

6
6. Description: Model SPU16.
6.1 Product identification.
6.2 Technical specifications
Pump:
Allowable operating pressure : 10,500 psi (720 bar)
Hydraulic oil contents : 1.79 qt (1700cc)
Usable hydraulic oil contents : 1.78 qt. (1680 cc)
Dimensions (LxWxH) : 20 ½” x 10 ¼” x 15 ¼” (522 x 260 x 388 mm)
Weight, ready for use (Core™) : 36.8 lbs. (16.7 kg)
Temperature range : -4 °F to +176 ºF -20 °C to +80 ºC
Engine:
Engine model : Honda GXH50
Engine type : 4-stroke, overhead camshaft, single cylinder
Displacement : 3.05 cu-in. (50cc)
Engine speed : 5500 rpm (with Eco Throttle™ switch off)
4000 – 5500 rpm (with Eco Throttle™ switch on)
Engine oil capacity : 0.26 qt. (250 cc)
Fuel tank capacity : 1.06 qt. (1000cc)
Fuel : Unleaded gasoline, Octane 86 or higher.
Cooling system : Forced air
Ignition system : Full transistor
Spark plug : CR5HSB (NGK)
A. Fuel tank cap vent lever G. Hydraulic oil level indicator M. Recoil starter
B. Hydraulic oil fill cap H. Fuel level indicator N. Engine on/off switch
C. Fuel cap I. Bypass valve O. ECO switch
D. Carrying handle J. LED indicator panel (Behind cover)
E. Spark plug service cover K. Core™ coupler (female) P. Choke
F. Muffler L. Hydraulic oil drain plug

7
A
7. Controls:
Engine Switch.
To start and stop the engine:
Switch Position:
OFF or 0: To stop the engine.
ON or 1: To start the engine.
NOTE: The engine switch also closes the fuel line between the fuel tank and the carburetor.
Recoil Starter.
To start and stop the engine, pull the starter cord lightly until resistance is felt, then pull fast.
NOTE: Do not allow the starter handle to snap back against the pump. Let the handle return gently
to prevent damage.
Fuel tank cap.
The fuel cap is supplied with a vent that can be closed
to seal the fuel tank. The vent lever must be in the
“ON” position for the engine to run.
NOTE: When the engine is not in use, set the vent
lever to the “OFF” position to prevent fuel leakage.
Allow the engine to cool before turning the vent
lever to the “OFF” position. .
LED indicator panel.
The pump is supplied with a LED panel that will indicate
when one of the following conditions exists.
Engine oil low:
The engine has a level switch that turns the engine off
automatically if one of the following conditions occurs:
The engine oil level is too low.
The pump is inclined at an angle greater than
20 degrees to the horizontal surface.
After the level switch has turned off the engine, the red
LED (A) will come on for a while. If you attempt to restart the engine, without adding engine oil or
leveling the pump, the red LED (A) will come on again.
Overheating:
The pump has an oil temperature sensor. If overheating
occurs, the red LED (B) will first flash. If the maximum
temperature is exceeded, the engine will turn off and the
red LED (B) will remain on for some time.
Service:
The pump has an indicator that shows when it is time for
the next service. When the service time is due, the green
LED (C) will flash. Contact your Holmatro dealer for maintenance of the pump. The service light
will not cause the engine to turn off, but it will continue to flash until service is performed.
A
DPU31
SPU16

8
Choke lever.
The choke is used to provide proper fuel-air mixture for
starting the engine when cold. The choke lever is moved
manually to the appropriate position. Move the choke
lever to CHOKE position to enrich the mixture for cold
starting. Move the choke lever to the RUN position after
the engine has warmed up or the engine begins to run
irregularly. To re-start a warm engine, the choke lever
may be left in the RUN position.
Ecothrottle™ switch
The Ecothrottle automatically reduces the engine to low RPM’s when the attached tool(s) are not
operating. When a tool is operated, the engine speed increases to provide the proper speed to power
the tool(s). The Ecothrottle™ switch for the SPU16 is located behind the maintenance cover. See
product ID, section 6.1.
ON: Press switch (C) to position (B). The
Ecothrottle is activated and will increase the
engine speed when a tool is used. When a
tool is not in use, the Ecothrottle reduces the
engine speed to low RPM and lower noise
levels and fuel consumption.
OFF: Press the switch (C) to position (A). The
Ecothrottle does not operate and the engine
speed remains at the maximum.
Pressure bypass valve
If it is not possible to disconnect the hydraulic hose from the pump when the attached tool is in the
neutral position, the pressure can be released using the bypass valve (A) located near each Core™
female coupler (B) on the pump.
Turn the engine off.
Turn screw (A) on the bypass valve clockwise
to the OPEN position until it stops. This will
release the pressure.
Disconnect the affected hose(s) from the pump.
Turn the screw (A) counterclockwise to the
CLOSED position.
Contact your Holmatro Dealer for service.
DPU31
SPU16

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8. Operation
The oil from the hydraulic pump is supplied to the tool via high-pressure hoses. The oil returns at
atmospheric pressure to the pump if the tool dead-man's handle is in the neutral position.
Tool Control Handle decal.
Oil is admitted under the tool piston if the dead-man's handle is in the “open” position. The tool will then
open. The oil above the piston flows back to the pump.
Oil is admitted above the tool piston if the dead-man's handle is in the “close” position. The tool will
close. The oil under the tool piston flows back to the pump.
The tool dead-man's handle always returns to the neutral position when released.
CORE™ TOOLS & PUMPS
The hydraulic system in the unit is provided with a safety valve. This safety valve prevents excessive
pressure in the tool if the return line to the pump is blocked. Never change the setting of this safety valve.
Oil will discharge from the rear of the tool if the return hose becomes blocked while the pump is running.
If this happens, first switch the pump engine/motor to OFF and disconnect the hose. Then connect a new
hose.
When Holmatro valve blocks are mounted on your Holmatro power unit, the manual operated
release valve is no longer needed. As soon as the hose is connected, oil is flowing through the hose’s inner
shell and returning back to the tank of the pump through the hose’s outer shell. When a rescue tool with
the adaptor installed has been connected to the hose, oil will flow into the tool. To change from
one rescue tool to another, the user simply disconnects the rescue tool from the hose and connects the
alternate rescue tool to the hose. Oil always flows from the female coupler into the male coupler for
Holmatro systems.

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9. Use
9.1 Initial use (first time only)
Check the equipment for damage. Do not use the equipment if it is not in good condition. Notify
the supplier. Check whether the warranty registration card has been supplied and filled in. This
must be sent back to Holmatro to register your warranty.
When you receive the pump it must first be made ready for operation. Perform the following
actions:
* Remove the red shipping cap from the hydraulic tank and replace it with the orange breather
cap. Note: Keep the red shipping cap and label for future shipping.
* Check the pump for external damage.
* Open the hydraulic fill cap vent.
Note: Keep the hydraulic fill cap label for future shipping.
* Check whether the bottle with engine oil has been supplied.
* Fill the crankcase with the specified amount of engine oil. The engine will be shipped with
approx. 20cc of additive for the first time use of the engine. Do not remove the additive.
* Fill the fuel tank with un-leaded gasoline up to the required level.
* Open the fuel cap vent.
* Switch the choke lever to its CHOKE position.
* Turn the engine switch to the ON or “1”position. This also opens the fuel valve.
* Pull the recoil starter until resistance is felt, let the cord be retracted and then pull fast.
Repeat this if the engine does not start the first time. This unit may require several pulls to
start the engine when it is received new from the factory. After the initial start-up the engine
should start after a few pulls of the recoil.
* Guide the starting cord back after starting.
Switch the choke lever to RUN after approx. 20 – 30 seconds, or when the engine begins to run
irregularly.
NOTE: Run the engine for at least 20 minutes or until the engine reaches operating temperature.
(Depending on ambient temperature. Run the engine longer in colder weather)
After verifying that the equipment operates, turn off the engine. To properly prepare the engine to
start again, the following shut down procedure is recommended:
Turn the engine switch to the OFF or “0” position.
Switch the choke lever to the CHOKE position and try to start the engine. The engine may
re-start and run for a few seconds. This is okay. If the engine does not start, pull the recoil
four more times.
On the last pull, pull the recoil slowly until resistance is felt. This will close the valves so
that moisture cannot enter the engine cylinder.
Leave the engine switch in the OFF or “0” position until ready to re-start the engine.
The pump is now ready for use.

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9.2 Connecting hoses and rescue equipment/use of pump.
9.2.1 Checklist:
Check the fluid levels only when the pump is in
horizontal position and the engine is switched
off. Ensure sufficient ventilation. Do not check
near open fire or sparks.
Engine Oil:
Check the engine oil level every
time before use. Remove the
dipstick and check the level Refill
if the level is too low (below level
B). Use only the recommended
engine oil. Fill to the
recommended oil level (A).
Remove excess engine oil if the
level is too high.
Use 4-stroke engine oil that meets
or exceeds the requirements of
API service classification SJ.
Always check the API SERVICE
label on the oil container to be sure it includes the letter SJ or higher.
SAE 10W-30 is recommended for general, all-temperature use. Other viscosities
shown in the chart may be used when the average temperature in your area is within
the indicated range.
Excess engine oil may cause pre-mature fouling
of the spark plug and may also lead to serious
engine damage.
B
A

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Gasoline:
Gasoline is highly flammable and explosive.
You can be burned or seriously injured when
handling fuel.
* Check the fuel level. Fill to recommended level if low.
* Use only un-leaded gasoline.
* Do not overfill the tank.
* Immediately remove any gasoline that spills.
Hydraulic oil:
Use only Holmatro recommended hydraulic
fluid. Use of hydraulic fluid other than that
recommended may cause damage to the pump.
* Check the hydraulic oil level through the level indicator on the front cover
* Fill to recommended level, shown on indicator decal, if low.
* Use only Holmatro recommended hydraulic oil.
* Do not overfill the tank.
* Immediately remove any hydraulic oil that spills.
9.2.2 Starting:
First complete the checklist in section 9.2.1.
* Turn the fuel cap vent lever to the ON position.
* Switch the choke lever to its CHOKE position.
* Turn engine switch to the ON or “1”position.
* Pull the cord until resistance is felt, let the cord be retracted and then pull fast. Repeat
this if the engine does not start the first time.
* Guide the starting cord back after starting.
Switch the choke lever to RUN when the engine has warmed up after approx. 20 - 30 seconds, or
when the engine begins to run irregularly.
NOTE: Start in the RUN position if the engine is still warm. Start in the CHOKE position if the
engine is cold or runs out of gasoline during operation.
NOTE: During equipment testing operations, run the engine for at least 20 minutes or until the
engine reaches operating temperature. (Depending on ambient temperature. Run the
engine longer in colder weather)

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9.2.3 Coupling
The unit is equipped with Core™ female quick-action couplings.
To couple the hoses using the Core coupler:
1. Remove the dust caps from both the male and female couplers.
2. Insert the male coupler into the female coupler and push.
3. The coupler’s locking ring (A) will move forward to show the coupler is locked.
4. Check to make sure the connection is made by pulling on the two couplers.
To uncouple the hoses using the flat face coupler:
1. Push the hose coupler gently forward into the tool/pump coupler.
2. Turn the locking ring (A) of the coupler ¼ turn counterclockwise when holding it in
your hand pointing away from you (direction of large arrow on coupler) and pull back
on the locking ring (direction of small arrow on coupler).
3. Remove the male coupler from the female coupler if it has not released completely.
4. Make sure you put the dust caps back onto the couplers when not in use. This is an
important step to keep dirt and foreign objects from getting into the coupler.
Core™ female coupler
Clean the female coupler by removing any dirt, oil, etc. with a clean dry rag. To ensure the
automatic locking capability of the coupler, the couplers and dust caps should be checked
periodically and cleaned by following the simple steps below:
1. Rinse the coupler and dust cap with lukewarm water and a soft soap solution.
2. When the coupling is dry and free from water, lubricate the flat end of the coupling (B) with
Holmatro recommended hydraulic oil or by spraying WD-40 onto the end.
3. Lubricate the locking sleeve by spraying WD-40 carefully in the area (C) between the back
part and the locking sleeve.
4. Connect the nipple into the coupling and see if the locking sleeve easily turns itself to the lock
position. Check by pulling the locking sleeve straight back. The nipple should not disconnect.
5. To disconnect the nipple, turn the locking sleeve and pull it backward.
6. Repeat steps 4 and 5 a few times to assist internal lubrication of the locking sleeve.

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9.2.4 Pressure relief device
A pressure relief device (PRD) is provided for relieving pressure in the hydraulic hose. The
pressure relief device is only used to relieve pressure in hoses caused by elevated
temperatures (i.e. if the hoses are left lying in the hot sun). Follow the operation instructions
below for proper use of the relief device and observe all warnings
The pressure relief device (PRD) hanging on front of the hydraulic rescue pump is only to be
used on pressurized hose caused by elevated temperatures (i.e. if the hoses are lying in the
hot sun.)
Never use the pressure relief device (PRD) on
the hydraulic pump valve control, on hoses, or
on rescue tools when the hydraulic pump is in
operation and is generating pressure. The relief
device may be damaged and serious injury may
occur. Wear protective glasses.
1 2 3
Open knob all
The way out counter-
clockwise.
Position male coupler on
hose into the PRD and
between the roll pins.
Always turn open side
of the relief device
away from you to
prevent oil spraying
upwards into the
operator’s eyes.
Turn the knob in to
release pressure in the
hose.
9.2.5Cleaning and storage
Clean the unit and any accessories used before storage.
* Clean all quick-action couplings and dust caps. Ensure that the dust caps are clean
and installed.
* Check the pump for external damage and/or oil leakage.
* Dry the unit if it has been used in wet conditions. Lightly oil the steel parts.
* Clean the pump with a mild soap solution and dry thoroughly.
* Always store the pump in a horizontal position.
* Ensure that the pump cannot tilt during transport. This can cause leakage of hydraulic
oil or gas.
* Check that the engine switch is in the OFF or “0” position.

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9.3 Important additional user information
9.3.1 Hoses
The hydraulic hoses that make up the
hydraulic system need attention. Observe the
following points:
1. Do not use hoses without proper anti-kink devices and prevent kinking behind the
attachment.
2. Prevent kinking of the hoses and never bend the hoses beyond their minimum bending
radius 89 mm (3 ½”).
3. Do not pull the hoses to move tools or pumps.
4. Prevent twisting of the hose.
5. Do not use the hoses to keep the equipment in position and especially not if the hoses
are pressurized.
6. Do not store hoses with the ends coupled together.

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9.3.2 Gasoline
The DPU31and SPU16 engines should be operated
using unleaded gasoline as recommended in the
Honda manual. Use of any other type of fuels may
cause permanent un-repairable damage to the engine.
Avoid high concentrates of alcohol-blended gasoline, and never use leaded gasoline in this
power unit. If you use an oxygenated gasoline, be sure it is unleaded and meets the
minimum octane rating requirement. Before using an oxygenated gasoline, try to confirm
the oxygenate contents. The following are the current United States Environmental
Protection Agency (EPA) approved percentages of oxygenates:
ETHANOL: You may use gasoline containing up to 10% by volume. Gasoline
containing ethanol may be marketed under the name gasohol.
METHANOL: You may use gasoline containing up to 5% methanol by volume as long
as it also contains co-solvents and corrosion inhibitors to protect the fuel
system.
NOTE: Check with your fuel supplier for information on any additional gasoline
regulations in your area.
9.3.3 High altitude operation
The standard fuel-air mixture is too rich for working at altitudes greater than 5,000 feet
(1500 meters). A very rich mixture will also foul the spark plug and cause hard starting.
Contact the Holmatro dealer to have the engine modified if the pump is to be always used at
altitudes greater than 5,000 feet (1500 meters). Even with carburetor modification, engine
horsepower will decrease about 3.5% for each 1,000 foot (300 meter) increase in altitude.
An engine modified for use above 5,000 feet
(1500 meters) may overheat if used at lower
altitudes, resulting in serious engine damage. For
use at low altitudes, have the modified engine
restored to its original factory specifications.

17
10. Troubleshooting
10.1 The engine fails to start
1
Check the engine oil
level 
(a) No or low
engine oil
(b) Excess
engine oil

(a) Add engine oil to correct
level
(b) Remove excess engine oil

Engine oil level okay
2 Check the fuel level No fuel Add fuel

Sufficient fuel
3 Check the engine
switch Switch is OFF Turn engine switch to ON

Switch is ON
4
Check position of the
choke switch
Cold engine in
CHOKE position.
Hot engine in RUN
position.

Incorrect
choke
Position. 
Set choke to correct position

Choke position okay
5 Check for kinked or
twisted fuel lines Kinked lines Remove kinks

Fuel lines free of
kinks
6
Check spark plug 
Fouled spark
plug and no or
weak spark 
Replace spark plug

Spark plug okay
7 Consult your
Holmatro dealer

18
10.2 The connected equipment is not operating - or not properly.
1 Check the pump hydraulic oil
level.
No or low hydraulic fluid 
Add recommended
hydraulic fluid up
correct level.

Hydraulic fluid level correct
2
Check the coupler connections.

Incorrect or
incomplete coupling.

Reconnect
couplings

Couplings correct
3 Consult your Holmatro dealer

10.3 The quick-action couplings cannot be connected.
1
Check tool control handle
position 
Handle in open or
close position 
Release control
handle to neutral
position

Control handle in neutral
2
Check for pressure in the hose.

Hose pressurized, but
not pre-connected to
pump/tool.

Release pressure in
hose using
Pressure Relief
Device (PRD)

Hose pressure relieved
3
Check for pressure in the tool.

Tool pressurized, but
not pre- connected to
hose line

Release pressure in
tool using PRD

Hose pressure relieved
4
Check for pressure in the pump.

Pump pressurized but
not pre-connected to
hose

Turn off pump &
Consult your
Holmatro dealer

pump not pressurized
5
Check the coupling locking
sleeve location or dirt in coupler 
Incorrect position or
dirt in coupler 
Release locking
sleeve. Clean
coupler

Locking ring released/Coupler
clean
6 Consult your Holmatro dealer

19
10.4 The quick-action couplings cannot be disconnected.
1 Check tool control handle
position Handle in open or close position Release control handle to neutral position

Control handle in neutral
2 Check the coupling locking
sleeve location Incorrect position Release locking sleeve

Locking ring released
3
Pump and/or hose(s)
pressurized.

System not
releasing pressure

a.TURN OFF PUMP
b. Release pressure at
bypass valve by
turning valve stem all
the way in 
clockwise.
c. Disconnect hose(s)
between pump and
tool(s).
d. Close bypass valve.
e. Connect a
replacement hose
between pump and
tool.
f. Restart pump. If the
problem continues,
repeat troubleshooting
(a-f) on the other
pump connection.
After completion of troubleshooting as described in step 3 (a – f):
Consult your Holmatro dealer in case of other problems or if the solutions provided above do not have the
required results.

System not operating normally on
both sides with replacement hose(s).

Consult your Holmatro dealer .
OR

System operation is okay on one side
only.

Continue the operation on the working
side. When the operation is complete,
consult your Holmatro dealer

20
11. Shipping
If the pump must be returned to an authorized repair facility,
ensure that the fuel tank is empty and the engine oil
removed.
Ship the pump with the red, shipping hydraulic cap on the
hydraulic oil tank. This red cap was either installed or
included with the unit when it was delivered. Shipping the
pump with the orange, breathable hydraulic cap installed
will cause oil to leak from the pump.
ALWAYS SHIP THE POWER UNIT IN ITS ORIGINAL SHIPPING BOX WITH ORIGINAL
PACKING MATERIALS. PLEASE CALL YOUR HOLMATRO DEALER FOR APPROPRIATE
SHIPPING MATERIALS AND INSTRUCTIONS BEFORE RETURNING THE POWER UNIT
FOR SERVICE/REPAIR.