Stanley HP Twin 8 User manual

© 2017 STANLEY Black & Decker, Inc.
New Britain, CT 06053
U.S.A.
72464 2/2018 Ver. 14
HYDRAULIC
POWER UNIT
USER MANUAL
Safety, Operation and Maintenance

2 ► HP TWIN8 User Manual

HP TWIN8 User Manual ◄ 3
SAFETY SYMBOLS ..................................................................................................................................................4
SAFETY PRECAUTIONS..........................................................................................................................................5
TOOL STICKERS......................................................................................................................................................7
HOSE TYPES............................................................................................................................................................8
HOSE RECOMMENDATIONS ..................................................................................................................................9
HTMA / EHTMA REQUIREMENTS .........................................................................................................................10
PREPARATION FOR USE ...................................................................................................................................... 11
OPERATION............................................................................................................................................................12
MAINTENANCE ......................................................................................................................................................13
CIRCUIT TESTING .................................................................................................................................................16
TROUBLESHOOTING ............................................................................................................................................17
SPECIFICATIONS...................................................................................................................................................18
ACCESSORIES & FILTERS....................................................................................................................................19
LOWER FRAME ILLUSTRATION ...........................................................................................................................20
LOWER FRAME PARTS LIST.................................................................................................................................21
HYDRAULIC GROUP ILLUSTRATION ...................................................................................................................22
HYDRAULIC GROUP PARTS LIST ........................................................................................................................23
UPPER FRAME ILLUSTRATION & PARTS LIST ...................................................................................................24
HYDRAULIC FLOW ................................................................................................................................................25
CONTROL BLOCK DETAIL.....................................................................................................................................26
HYDRAULIC & FUEL TANKS..................................................................................................................................27
ELECTRICAL SCHEMATIC.....................................................................................................................................28
TABLE OF CONTENTS
SERVICING: This manual contains safety, operation and routine maintenance instructions. STANLEY Infrastructure
recommends that servicing of hydraulic tools, other than routine maintenance, must be performed by an authorized
and certied dealer. Please read the following warning.
To ll out a product warranty validation form, and for information on your warranty,
visit www.stanleyinfrastructure.com and select the Company tab > Warranty.
Note: The warranty validation record must be submitted to validate the warranty.
SERIOUS INJURY OR DEATH COULD RESULT FROM THE IMPROPER REPAIR OR
SERVICE OF THIS TOOL.
REPAIRS AND / OR SERVICE TO THIS TOOL MUST ONLY BE DONE BY AN
AUTHORIZED AND CERTIFIED DEALER.
For the nearest certied dealer, call STANLEY Infrastructure at [phone] and ask for a Customer Service Representative.

4 ► HP TWIN8 User Manual
Always observe safety symbols. They are included for your safety and for the protection of the tool.
LOCAL SAFETY REGULATIONS
Enter any local safety regulations here. Keep these instructions in an area accessible to the operator and
maintenance personnel.
Safety symbols and signal words, as shown below, are used to emphasize all operator, maintenance and repair
actions which, if not strictly followed, could result in a life-threatening situation, bodily injury or damage to equipment.
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.
This safety alert and signal word indicates an imminently hazardous situation
which, if not avoided, will result in death or serious injury.
This safety alert and signal word indicates a potentially hazardous situation
which, if not avoided, could result in death or serious injury.
This safety alert and signal word indicates a potentially hazardous situation
which, if not avoided, could result in death or serious injury.
This signal word indicates a potentially hazardous situation which, if not avoided,
may result in property damage.
This signal word indicates a situation which, if not avoided, will result in damage
to the equipment.
This signal word indicates a situation which, if not avoided, may result in damage
to the equipment.
SAFETY SYMBOLS

HP TWIN8 User Manual ◄ 5
Tool operators and maintenance personnel must always
comply with the safety precautions given in this manual
and on the stickers and tags attached to the tool and
hose.
These safety precautions are given for your safety.
Review them carefully before operating the tool and
before performing general maintenance or repairs.
Supervising personnel should develop additional
precautions relating to the specic work area and local
safety regulations. If so, place the added precautions in
the space provided in this manual.
The HP TWIN8 Hydraulic Power Unit will provide safe and
dependable service if operated in accordance with the
instructions given in this manual. Read and understand
this manual and any stickers and tags attached to the
tool and hoses before operation. Failure to do so could
result in personal injury or equipment damage.
• Operator must start in a work area without
bystanders. The operator must be familiar with all
prohibited work areas such as excessive slopes and
dangerous terrain conditions.
• Establish a training program for all operators to
ensure safe operation.
• Do not operate the power unit unless thoroughly
trained or under the supervision of an instructor.
• Always wear safety equipment such as goggles,
ear protection, breathing protection, head protection
and safety shoes at all times when operating the
power unit and a hydraulic tool.
• Do not inspect or clean the power unit while it is
running. Accidental engagement of the unit can
cause serious injury.
• Always use hoses and ttings rated at 2500 psi/172
bar with a 4-to-1 safety factor. Be sure all hose
connections are tight.
• Be sure all hoses are connected for correct ow
direction to and from the tool being used.
• Do not inspect hoses and ttings for leaks by using
bare hands. “Pin-hole” leaks can penetrate the skin.
• NEVER OPERATE THE POWER UNIT IN A
CLOSED SPACE. Inhalation of engine exhaust can
be fatal.
• Do not operate a damaged or improperly adjusted
power unit.
• Do not wear loose clothing or unbound long hair
when operating the tool. Loose items can become
entangled with the tool and cause serious injury.
• Keep all parts of your body away from the working
parts of the power unit.
• Keep clear of hot engine exhaust.
• Do not add fuel to the power unit while the power
unit is running or is still hot.
• Do not operate the power unit if gasoline odor is
present.
• Do not use ammable solvents around the power
unit engine.
• Do not operate the power unit within 3.3 ft/1 m of
buildings, obstructions or ammable objects.
• Do not reverse tool rotation direction by changing
uid ow direction.
• Allow power unit engine to cool before storing in an
enclosed space.
• Always keep critical tool markings, such as labels
and warning stickers, legible.
• To avoid personal injury or equipment damage,
all tool repair, maintenance and service must only
be performed by authorized and properly trained
personnel.
• Do not operate the machine on excessive slopes or
unstable terrain where “tip over” is a hazard.
• Do not exceed the rated limits of the equipment
or use the equipment for applications beyond its
design capacity.
• Be aware of surrounding hazards. Noise created by
the power unit and the tools it operates may mask
early indications of approaching hazards. Warning:
Hydraulic uid under pressure could cause skin
injection injury. If you are injured by hydraulic uid,
get medical attention immediately.
• Be observant of the hydraulic hoses lying about the
work area, they can be a tripping hazard.
• Use proper lifting techniques when handling the
power unit and do not over-reach.
• Only use the power unit in well-ventilated areas. DO
NOT operate in explosive atmospheres, in closed
environments or near ammable substances.
• Always be well-rested and mentally alert when
operating the power unit and tools. DO NOT operate
SAFETY PRECAUTIONS

6 ► HP TWIN8 User Manual
if affected by medications, drugs or alcohol.
• Keep clear of hot engine parts and exhaust.
• Do not operate tools if oil temperature exceeds 140
°F/60 °C. Operation at high temperatures can cause
operator discomfort or injury.
• Disconnect battery before servicing electrical
components. Electrocution or burns could result
from improper contact.
• Loading and unloading of the power unit is
dangerous. Never attempt to load or unload the
power unit without loading ramps, loading dock or
an over head crane. Loading ramps must be strong
enough, have a low angle and correct height. Load
and unload the power unit on a level surface. Never
attempt to load or unload the power unit if the ramp
incline exceeds 15 degrees. Failure to follow these
instructions may result in serious injury or death.
• Warning: Use of this tool on certain materials
could generate dust potentially containing a variety
of hazardous substances such as asbestos,
silica or lead. Inhalation of dust containing these
or other hazardous substances could result in
serious injury, cancer or death. Protect yourself
and those around you. Research and understand
the materials you are cutting. Follow correct safety
procedures and comply with all applicable national,
state or provisional health and safety regulations
relating to them, including, if appropriate arranging
for the safe disposal of the materials by a qualied
person.
• Warning: When using pressure cleaning
equipment, do not aim the jet directly at electrical
component parts and insulating material. Do not
place the water jet directly in the air intake ports.
Blow the unit dry before operating.
SAFETY PRECAUTIONS

HP TWIN8 User Manual ◄ 7
DASH, TWIN8, DECAL P/N-205043
LOGO, TWIN8 DECAL P/N-74771
STANLEY, FUEL TANK DECAL P/N-74706
LOGO, TWIN8, FUEL TANK DECAL P/N-205045
STANLEY, HYD TANK, DECAL P/N-74770
YELLOW ON CLEAR BACKGROUND
LOGO TWIN8, HYD TANK DECAL P/N-205046
SAFETY, TWIN8, DECAL P/N-205047
TOOL STICKERS

8 ► HP TWIN8 User Manual
The rated working pressure of the hydraulic hose must be equal to or higher than the relief valve setting on the
hydraulic system. There are three types of hydraulic hose that meet this requirement and are authorized for use with
STANLEY hydraulic tools. They are:
Certi ed non-conductive — constructed of thermoplastic or synthetic rubber inner tube, synthetic  ber braid
reinforcement, and weather resistant thermoplastic or synthetic rubber cover. Hose labeled certifi ed non-
conductive is the only hose authorized for use near electrical conductors.
Wire-braided (conductive) — constructed of synthetic rubber inner tube, single or double wire braid
reinforcement, and weather resistant synthetic rubber cover. This hose is conductive and must never be used
near electrical conductors.
Fabric-braided (not certi ed or labeled non-conductive) — constructed of thermoplastic or synthetic rubber
inner tube, synthetic  ber braid reinforcement, and weather resistant thermoplastic or synthetic rubber cover.
This hose is not certifi ed non-conductive and must never be used near electrical conductors.
HOSE SAFETY TAGS
To help ensure your safety, the following DANGER tags are attached to all hose purchased from STANLEY. DO
NOT REMOVE THESE TAGS.
If the information on a tag is illegible because of wear or damage, replace the tag immediately. A new tag may be
obtained from your STANLEY Distributor.
THE TAG SHOWN BELOW IS ATTACHED TO “CERTIFIED NON-CONDUCTIVE” HOSE
THE TAG SHOWN BELOW IS ATTACHED TO “CONDUCTIVE” HOSE.
(Shown smaller than actual size)
SIDE 1
DANGER
1. FAILURE TO USE HYDRAULIC HOSE LABELED AND CERTIFIED AS NON-CONDUCTIVE
WHEN USING HYDRAULIC TOOLS ON OR NEAR ELECTRIC LINES MAY RESULT IN
DEATH OR SERIOUS INJURY.
FOR PROPER AND SAFE OPERATION MAKE SURE THAT YOU HAVE BEEN PROPERLY
TRAINED IN CORRECT PROCEDURES REQUIRED FOR WORK ON OR AROUND
ELECTRIC LINES.
2. BEFORE USING HYDRAULIC HOSE LABELED AND CERTIFIED AS NON-CONDUCTIVE
ON OR NEAR ELECTRIC LINES. WIPE THE ENTIRE LENGTH OF THE HOSEAND FITTING
WITH A CLEAN DRY ABSORBENT CLOTH TO REMOVE DIRT AND MOISTURE AND TEST
HOSE FOR MAXIMUM ALLOWABLE CURRENT LEAKAGE IN ACCORDANCE WITH SAFETY
DEPARTMENT INSTRUCTIONS.
SEE OTHER SIDE
SIDE 2
DO NOT REMOVE THIS TAG
3. DO NOT EXCEED HOSE WORKING PRESSURE OR ABUSE HOSE. IMPROPER USE
OR HANDLING OF HOSE COULD RESULT IN BURST OR OTHER HOSE FAILURE.
KEEP HOSE AS FAR AWAY AS POSSIBLE FROM BODY AND DO NOT PERMIT DIRECT
CONTACT DURING USE. CONTACT AT THE BURST CAN CAUSE BODILY INJECTION
AND SEVERE PERSONAL INJURY.
4. HANDLE AND ROUTE HOSE CAREFULLY TO AVOID KINKING, ABRASION, CUTTING, OR
CONTACT WITH HIGH TEMPERATURE SURFACES. DO NOT USE IF KINKED. DO NOT
USE HOSE TO PULL OR LIFT TOOLS, POWER UNITS, ETC.
5. CHECK ENTIRE HOSE FOR CUTS CRACKS LEAKS ABRASIONS, BULGES, OR DAM-
AGE TO COUPLINGS IF ANY OF THESE CONDITIONS EXIST, REPLACE THE HOSE
IMMEDIATELY. NEVER USE TAPE OR ANY DEVICE TO ATTEMPT TO MEND THE HOSE.
6. AFTER EACH USE STORE IN A CLEAN DRY AREA.
SEE OTHER SIDE
DANGER
DO NOT REMOVE THIS TAG
DANGER
(Shown smaller than actual size)
SIDE 2
5. CHECK ENTIRE HOSE FOR CUTS CRACKS LEAKS ABRASIONS, BULGES, OR DAMAGE TO
COUPLINGS IF ANY OF THESE CONDITIONS EXIST, REPLACE THE HOSE IMMEDIATELY.
NEVER USE TAPE OR ANY DEVICE TO ATTEMPT TO MEND THE HOSE.
6. AFTER EACH USE STORE IN A CLEAN DRY AREA.
DANGER
DO NOT REMOVE THIS TAG
DANGER
SIDE 1
1. DO NOT USE THIS HYDRAULIC HOSE ON OR NEAR ELECTRIC LINES. THIS HOSE IS
NOT LABELED OR CERTIFIED AS NON-CONDUCTIVE. USING THIS HOSE ON OR NEAR
ELECTRICAL LINES MAY RESULT IN DEATH OR SERIOUS INJURY.
2. FOR PROPER AND SAFE OPERATION MAKE SURE THAT YOU HAVE BEEN PROPERLY
TRAINED IN CORRECT PROCEDURES REQUIRED FOR WORK ON OR AROUND ELEC-
TRIC LINES.
3. DO NOT EXCEED HOSE WORKING PRESSURE OR ABUSE HOSE. IMPROPER USE OR
HANDLING OF HOSE COULD RESULT IN BURST OR OTHER HOSE FAILURE. KEEP HOSE
AS FAR AWAY AS POSSIBLE FROM BODY AND DO NOT PERMIT DIRECT CONTACT
DURING USE. CONTACT AT THE BURST CAN CAUSE BODILY INJECTION AND SEVERE
PERSONAL INJURY.
4. HANDLE AND ROUTE HOSE CAREFULLY TO AVOID KINKING, CUTTING, OR CONTACT
WITH HIGH TEMPERATURE SURFACES. DO NOT USE IF KINKED. DO NOT USE HOSE TO
PULL OR LIFT TOOLS, POWER UNITS, ETC.
DO NOT REMOVE THIS TAG
DANGER
SEE OTHER SIDE SEE OTHER SIDE
HOSE TYPES

HP TWIN8 User Manual ◄ 9
Oil Flow Hose Lengths Inside Diameter USE
(Press/Return)
Min. Working Pressure
GPM LPM FEET METERS INCH MM PSI BAR
Certi ed Non-Conductive Hose - Fiber Braid - for Utility Bucket Trucks
4-9 15-34 up to 10 up to 3 3/8 10 Both 2250 155
Conductive Hose - Wire Braid or Fiber Braid -DO NOT USE NEAR ELECTRICAL CONDUCTORS
4-6 15-23 up to 25 up to 7.5 3/8 10 Both 2500 175 4-6 15-23 26-100 7.5-30 1/2 13 Both 2500 175
5-10.5 19-40 up to 50 up to 15 1/2 13 Both 2500 175
5-10.5 19-40 51-100 15-30 5/8 16 Both 2500 175 5-10.5 19-40 100-300 30-90 5/8 16 Pressure 2500 175
3/4 19 Return 2500 175
10-13 38-49 up to 50 up to 15 5/8 16 Both 2500 175 10-13 38-49 51-100 15-30 5/8 16 Pressure 2500 175
3/4 19 Return 2500 175
10-13 38-49 100-200 30-60 3/4 19 Pressure 2500 175
1 25.4 Return 2500 175
13-16 49-60 up to 25 up to 8
5/8 16 Pressure 2500 175 3/4 19 Return 2500 175
13-16 49-60 26-100 8-30
3/4 19 Pressure 2500 175
1 25.4 Return 2500 175
Figure 1. Typical Hose Connections
Tool to Hydraulic Circuit Hose Recommendations The chart to the right shows recommended minimum hose diameters for various hose lengths based on gallons per minute (GPM)/liters per minute (LPM). These recommendations are intended to keep return line pressure (back pressure) to a minimum acceptable level to ensure maximum tool performance. This chart is intended to be used for hydraulic tool applications only based on STANLEY tool operating requirements and should not be used for any other applications. All hydraulic hose must have at least a rated minimum working pressure equal to the maximum hydraulic system relief valve setting. All hydraulic hose must meet or exceed speci cations as set forth by SAE J517.
PRESSURE
RETURN
<<< FLOW
FLOW >>>
HOSE RECOMMENDATIONS

10 ► HP TWIN8 User Manual
HTMA / EHTMA REQUIREMENTS
TOOL TYPE
HTMA
HYDRAULIC SYSTEM REQUIREMENTS TYPE I TYPE II TYPE RR TYPE III
Flow range 4-6 GPM
(15-23 LPM)
7-9 GPM
(26-34 LPM)
9-10.5 GPM
(34-40 LPM)
11-13 GPM
(42-49 LPM)
Nominal operating pressure
(At the power supply outlet)
1500 psi
(103 bar)
1500 psi
(103 bar)
1500 psi
(103 bar)
1500 psi
(103 bar)
System relief valve setting
(At the power supply outlet)
2100-2250 psi
(145-155 bar)
2100-2250 psi
(145-155 bar)
2200-2300 psi
(152-159 bar)
2100-2250 psi
(145-155 bar)
Maximum back pressure
(At tool end of the return hose)
250 psi
(17 bar)
250 psi
(17 bar)
250 psi
(17 bar)
250 psi
(17 bar)
Measured at a max  uid viscosity of:
(At minimum operating temperature)
400 ssu*
(82 centistokes)
400 ssu*
(82 centistokes)
400 ssu*
(82 centistokes)
400 ssu*
(82 centistokes)
Temperature: Suf cient heat rejection capacity to limit
maximum  uid temperature to:
(At maximum expected ambient temperature)
140° F
(60° C)
140° F
(60° C)
140° F
(60° C)
140° F
(60° C)
Minimum cooling capacity at a temperature difference of
between ambient and  uid temps
3 hp
(2.24 kW)
40° F
(22° C)
5 hp
(3.73 kW)
40° F
(22° C)
6 hp
(5.22 kW)
40° F
(22° C)
7 hp
(4.47 kW)
40° F
(22° C)
NOTE: Do not operate the tool at oil temperatures above 140° F (60° C). Operation at higher temperatures can cause operator
discomfort at the tool.
Filter minimum full- ow  ltration 25 microns 25 microns 25 microns 25 microns
Sized for  ow of at least:
(For cold temp startup and maximum dirt-holding capacity)
30 GPM
(114 LPM)
30 GPM
(114 LPM)
30 GPM
(114 LPM)
30 GPM
(114 LPM)
Hydraulic  uid, petroleum based (premium grade, anti-
wear, non-conductive) Viscosity (at minimum and maximum
operating temps)
100-400 ssu
(20-82
centistokes)
100-400 ssu
(20-82
centistokes)
100-400 ssu
(20-82
centistokes)
100-400 ssu
(20-82
centistokes)
NOTE: When choosing hydraulic  uid, the expected oil temperature extremes that will be experienced in service determine the most
suitable temperature viscosity characteristics. Hydraulic  uids with a viscosity index over 140 will meet the requirements over a wide
range of operating temperatures.
*SSU = Saybolt Seconds Universal
CLASSIFICATION
EHTMA
HYDRAULIC SYSTEM
REQUIREMENTS BCD
Flow range
3.5-4.3 GPM
(13.5-16.5
LPM)
4.7-5.8 GPM
(18-22 LPM)
7.1-8.7 GPM
(27-33 LPM)
9.5-11.6 GPM
(36-44 LPM)
11.8-14.5 GPM
(45-55 LPM)
Nominal operating pressure
(At the power supply outlet)
1870 psi
(129 bar)
1500 psi
(103 bar)
1500 psi
(103 bar)
1500 psi
(103 bar)
1500 psi
(103 bar)
System relief valve setting
(At the power supply outlet)
2495 psi
(172 bar)
2000 psi
(138 bar)
2000 psi
(138 bar)
2000 psi
(138 bar)
2000 psi
(138 bar)
NOTE: These are general hydraulic system requirements. See tool speci cation page for tool speci c requirements.
HTMA / EHTMA REQUIREMENTS

HP TWIN8 User Manual ◄ 11
QUICK DISCONNECT COUPLERS
HTMA-approved quick disconnect couplings are
installed to hydraulic hoses so that the direction of
oil ow is always from the male to the female quick
disconnect as shown on “Hose Recommendations” on
page 9. Quick disconnect couplings and hose ttings
are selected so that additional ttings such as reducer or
adapter ttings are not required.
If adapter ttings are used, they must be approved steel
hydraulic ttings meeting a minimum operating pressure
rating of 2500 psi/172 bar. Do not use galvanized pipe
ttings or black pipe ttings.
Use thread tape or pipe joint compound when installing
quick disconnect couplings to hose or tool ttings. Follow
the instructions furnished with the selected thread
sealant. DO NOT OVERTIGHTEN THE FITTINGS.
PREPARATION FOR USE
Do not operate the power unit until you have read the engine
operating and maintenance instructions manual furnished
with the unit.
1. ENGINE CRANKCASE OIL LEVEL
Always check the oil level before starting the engine. Make
sure the oil level is at the FULL MARK on the dipstick. Do not
overll. Use detergent oil classied “For Service SF, SG, SH,
SJ or higher” as specied in the engine operators manual. Do
not use special additives. Outdoor temperatures determine
the proper oil viscosity for the engine. Use the chart to
select the best viscosity for the outdoor temperature range
expected.
* Below 40°F (4°C) the use of SAE 30 will result in hard
starting.
** Above 80°F (27°C) the use of 10W-30 may cause
increased oil consumption. Check oil level more
frequently.
2. ENGINE FUEL LEVEL
Check the fuel level. If low, ll with clean, fresh unleaded
gasoline with a minimum of 87 octane. Gasoline with up to
10% ethanol (gasohol) is acceptable.
3. HYDRAULIC CONNECTIONS
The recommended hose length is 25 ft/8 m with a 1/2
inch/12.7 mm inside diameter. The hoses must have
a working pressure rating of at least 2500 psi/175 bar.
Each hose end must have male thread ends compatible
with HTMA (Hydraulic Tool Manufacturers Associations)
quick disconnect ttings (NPT type threads).
°F °C
104 40
86 30
68 20
50 10
32 0
14 -10
-4 -20
-22 -30
SAE 30 *
Synthetic 5W-30
5W-30
10W-30 **
PREPARATION FOR USE
Brand Biodegradable Description
CITGO No Hydurance AW32
AMS Oil No HVH 32
Exxon Mobil No Univis HVI26*
Exxon Mobil No DTE 10 Excel
Shell No S2 V 32
Chevron No Rando HDZ 32
Conoco Phillips No Unax AW-WR-32
Clarion (CITGO) Yes Green Bio 32
Exxon Mobil Yes EAL 224H
Chevron Yes Clarity AW32
Terresolve Yes Envirologic 132
Shell Yes Naturelle HF-E-32
3. HYDRAULIC FLUID
RECOMMENDED HYDRAULIC OILS
Below is a list of recommended oils by brand.
*Recommended for extreme cold temperatures

12 ► HP TWIN8 User Manual
COUPLERS (HOSE CONNECTIONS)
Facing the control panel, the top (2) male couplers are
the PRESSURE FLUID OUT ttings. The bottom (2)
female quick disconnect couplers are the RETURN
FLUID IN. Their are two independent circuits, one on the
left and one on the right, each controlled by the adjacent
lever.
When the throttle control lever is in the far left position,
it will produce 5 GPM to both circuits. With the lever in
the far right position will produce 8 GPM to both circuits.
This allows two tools that can run simultaneously at 5 or
8 GPM.
The ow control levers, when turned “ON” (up position),
turns on ow.
STARTUP
1. Before starting the engine, check the engine oil and
hydraulic uid level.
2. Check to make sure the ow Control levers are in
the OFF position (Down). The power unit will not
start if the levers are in the “UP” position (ON).
3. Connect hoses and the tool as described in “Hose
Recommendations” on page 9.
4. It is not necessary to choke the engine. The engine
is equipped with an electronic fuel management
system and does not have a manual choke.
5. Set the throttle control lever to the left (5-GPM)
setting. Once the unit starts and is warmed-up the
lever can be moved to the 8-GPM setting if desired.
6. Turn the Ignition Switch to the START position. After
the engine starts, release the switch.
7. Allow the engine to warm up.
8. Turn on the ow to the tool by lifting the ow control
levers up into the “ON” position, lift both levers if
running two circuits.
SHUTDOWN
1. Ensure the ow control levers are in the OFF position
(Down).
2. Move the Ignition Switch to the OFF position.
Top Male Quick Disconnect
Couplers (Pressure Fluid Out)
Bottom Female Quick Disconnect
Couplers (Return Fluid In)
Flow Control Lever(s) In Off Position
Throttle Control Lever
If the engine runs out of gas or dies during operation
and the ignition switch is left in the ON or RUN
position as this will drain the battery. Make sure the
ignition switch is returned to the OFF position.
Starter Switch
OPERATION
5. BATTERY
The supplied 12-Volt DC battery is a sealed non-
spillable, maintenance-free battery and is fully charged.
Make sure the battery cables are tight and charging
circuit functions are operating properly.
CONTROLS (DUAL CIRCUIT)
A fully charged battery should read 12.8V -13.0V.
Overcharging can harm your battery beyond
recovery. When using an automatic charger, refer to
the charger manufacturer’s instructions.

HP TWIN8 User Manual ◄ 13
COLD WEATHER STARTUP
1. Use the procedures described under “STARTUP”
and then follow the procedure below.
2. Hydraulic uids are thicker in cold weather.
Therefore, it is recommended that the engine be run
at low idle long enough to bring the uid temperature
up to a minimum of 50 °F/10 °C.
3. If the tools and tool hoses are cold, it is recommended
to allow hydraulic uid to circulate through the tool
hoses until warm, before using the tool.
of operation. Change more often if cold, moist or
dusty conditions exist.
• Check oil cooler for debris. Remove debris with air
pressure.
BATTERY MAINTENANCE
• If the power unit is not in use for two or more
months, check the battery once a month and
charge if the battery voltage is below 12.5V.
Charge at 1.3A for 5-10 hours.
• If the battery voltage is below 12.0V, charge at 1.3A
for 12-18 hours, let the battery sit for 1-2 hours and
check the voltage. If the voltage is not 12.5V or
greater, replace the battery.
• Always charge using a charger as rated as close to
1.3A as possible.
• Checking battery voltage and charging can be
done through the 12V marine plug on the battery
cover when using an appropriate adapter.
STORAGE
• Clean the unit thoroughly before storage. Do not use
water pressure.
• Always store the unit in a clean and dry facility.
• If the unit will be stored for a prolonged period (over
30 days), add a fuel additive to the fuel tank to
prevent the fuel from gumming. Run engine for 2
minutes to circulate the additive throughout the fuel
system.
•
When storing fuel or equipment with fuel in the tank,
store away from appliances that have pilot lights or
other ignition sources as they can ignite fuel vapors.
Replace crankcase oil with new oil.
• Remove spark plugs and pour approximately 1
ounce (30 ml) of engine oil into each cylinder.
Replace spark plugs and crank the engine slowly to
distribute the oil.
• Check hydraulic reservoir for water. If water is
found, change the oil and circulate it through the
tool hose and tool. (See “HYDRAULIC SYSTEM
MAINTENANCE” on page 13).
• Disconnect tool hoses.
ENGINE MAINTENANCE
Follow the maintenance schedule and general
maintenance instructions and emissions control
maintenance in the engine operators manual furnished
with the power unit.
Fuel system emissions maintenance:
• Check the fuel system emissions components
once a year to verify that the components are in
good condition and do not show signs of leakage. If
leakage is found, replace part.
• Check fuel lines, tank, cap and ttings frequently for
cracks or leaks. Replace if necessary.
• Clean the fuel cap area of dirt and debris.
• Replacement parts must be the same and installed
in the same position as the original parts.
HYDRAULIC SYSTEM MAINTENANCE
• Check hydraulic uid level daily. Add uid per
specications in this manual. (See “3. HYDRAULIC
FLUID” on page 11.)
• Remove condensed moisture from the hydraulic
uid by pumping the hydraulic uid into a 5 gal/20 L.
container through the pressure hose. Make sure the
engine is at idle when performing this procedure.
When the hydraulic reservoir is empty turn the
engine off immediately.
• Allow the uid to sit long enough for the water to
settle to the bottom of the container. Slowly pour the
uid back into the hydraulic tank, avoiding the water
at the bottom of the container.
• Each day, check hydraulic lines and ttings for
leaks, kinks, etc. Do not use your hand to perform
this check.
• Change the hydraulic lter element every 200 hours
MAINTENANCE

14 ► HP TWIN8 User Manual
Hours Daily 5 25 50 75 100 125 150 175 200
Foam Air Pre-Cleaner C I I R I I I R
Paper Air Filter C R R
In-line Fuel Filter R
Spark Plugs (Gap-0.030 in (0.76 mm) R R
Engine Oil Filter RRRRR
Engine Oil RRRRR
Engine Oil Level I
Remove Dirt & Debris With Brush I
Clean Air Cooling System (don’t use water) C C
Hydraulic Fluid Level I
Hydraulic Fluid R
Remove Condensed Moisture R R
Check For Leaks, Kinks, etc. I
Hydraulic Fluid Filter I I I R
Clean Hydraulic Fluid Cooler C C
Relief Valve Settings IIII
EngineHydraulics
Standard Maintenance Schedule
Hours Daily 5 25 50 75 100 125 150 175 200
Foam Air Pre-Cleaner C* R I R I R I R
Paper Air Filter C* R R R R
In-line Fuel Filter R
Spark Plugs (Gap-0.030 in (0.76 mm) RRRR
Engine Oil Filter RRRRRRRRR
Engine Oil RRRRRRRRR
Engine Oil Level I
Remove Dirt & Debris With Brush I
Clean Air Cooling System (don’t use water) CCCC
Hydraulic Fluid Level I
Hydraulic Fluid R
Remove Condensed Moisture RRRR
Check For Leaks, Kinks, etc. I
Hydraulic Fluid Filter I R I R
Clean Hydraulic Fluid Cooler ** C C C C
Relief Valve Settings IIII
EngineHydraulics
Heavy Duty Maintenance Schedule
C
I
R
Clean (* In dusty conditions or when airborne debris is present, clean more often).
Replace
Inspect (** In dusty conditions or when airborne debris is present, inspect the back side of cooler often).
For additional maintenance information see the Briggs & Stratton engine operator’s manual that was supplied
with the power unit.
MAINTENANCE

HP TWIN8 User Manual ◄ 15
FUEL FILTER, FUEL LINE
FROM TANK TO FILTER
“GG” CONNECTION
See page 27
FUEL LINE FROM TANK
TO FUEL PUMP
FUEL VAPOR LINE
FROM CARBON CANISTER
TO ENGINE (CONNECTION “HH”)
See page 27
ENGINE OIL CHECK &
FILL (DIP STICK)
QUICK ENGINE
OIL DRAIN
HYDRAULIC OIL FILTER
THROTTLE
CABLE
AIR CLEANER
FUEL TANK
HYDRAULIC
TANK
SPARK PLUG
ENGINE OIL
COOLER
HYDRAULIC
OIL COOLER
SEE page 19 FOR REPLACEMENT FILTER PART NUMBERS
MAINTENANCE

16 ► HP TWIN8 User Manual
GENERAL
Tests and adjustments should be performed periodically
to ensure the power unit is operating at maximum
efciency. Use a calibrated ow and pressure tester.
This tester can be used to isolate problems in both the
engine and hydraulic system prior to any power unit
disassembly.
TESTING THE HYDRAULIC CIRCUIT
The following tests can be performed to ensure that
the hydraulic pump is supplying the correct ow and
pressure and that the system relief valve is operating
properly.
During these tests, make sure the engine is warm and
operating smoothly. If test results are not as specied,
refer to the troubleshooting table in this section for
possible causes.
TESTING THE 5 OR 8 GPM CIRCUIT
To test the circuit, proceed as follows:
1. Install a calibrated ow and pressure tester across
the two hose ends (where the tool would normally
be connected).
2. Set both ow control levers to the OFF (down)
position.
3. Set the throttle control lever to the far left for 5 GPM,
after the engine is started you can leave the lever
in this position if you are testing the 5 GPM circuit
or move the lever to the far right to test the 8 GPM
circuit.
4. Check that the tester restrictor valve is fully open
(counterclockwise) on the ow and pressure tester.
5. Start the engine and allow it to run until warm.
6. With the throttle control in the far left position, the
5-GPM circuit can be tested, or moving the lever to
the far right will allow testing the 8-GPM circuit.
a. 5-GPM Range 4-6 GPM/15-23 LPM
b. 8-GPM Range 7-9 GPM/26.5-34 LPM
7. Slowly turn the restrictor valve clockwise while
watching the pressure gauge. The ow rate shown
above in step 6 should stay at the selected ow
range.
8. When the pressure reaches 2100–2200 psi/145–
152 bar, the relief valve should begin to open. The
pressure at which the relief valve just begins to open
is commonly referred to as the “cracking pressure”.
At the “cracking pressure,” the ow rate should start
to drop because the relief valve is allowing uid to
bypass to the hydraulic reservoir. The “cracking
pressure” is preset at the factory and if it is not
within the above range (2100-2200) psi, the relief
valve must be re-set as follows: The relief valves are
located on the control block which is directly behind
the couplers on the dash panel (See item 10, page
22) for location. Use a wrench to loosen the nut
on the relief valve.
9. Use an Allen wrench to adjust the relief valve. Turn
clockwise to raise the pressure and counterclockwise
to reduce the pressure. Tighten the nut and retest.
10. Check both the 5 and 8 GPM ow settings and then
follow the same procedure to test the other circuit
(each circuit has its own relief valve).
Flow Control Lever(s)
Throttle Control Lever
CIRCUIT TESTING

HP TWIN8 User Manual ◄ 17
Problem Cause Solution
Engine will not start Battery not connected. Attach battery cables, check wires.
Weak battery. Test battery, charge or replace.
No fuel. Add fuel.
Fuel lter plugged. Replace fuel lter.
Defective spark plugs.
Low Engine Oil
Remove plugs, check gap, clean or
replace.
Check Oil Level
Flow Control Levers in the “ON”
position.
Move the levers to the off position.
Fluid blowing out of uid reservoir
vent.
Hydraulic tank overlled. Correct the uid level.
Pump suction leak. Check suction connections. Tighten
if necessary.
Hydraulic tool won’t operate. Flow control lever(s) not in the (ON)
position.
Check that the ow control lever(s)
are in the ON position.
Incorrect hose connection to tool. Make sure the tool hose circuit
goes from left (pressure) tting to
tool and back to the right tting
(return). Fluid always ows from the
male to female ttings.
Quick disconnect ttings defective. Detach from hose, connect set
together and check for free ow.
Hydraulic uid level low. Check for correct uid level. Fill
using the recommended uid.
Relief valve stuck open. Adjust or replace valve.
Suction hose kinked. Make sure suction hose from
uid reservoir to pump inlet has a
smooth curve.
Tool is defective. Refer to tool manual.
TROUBLESHOOTING

18 ► HP TWIN8 User Manual
Engine: ............................................................................................................. 27 hp OHV, Briggs & Stratton Engine
Output Capacity (Dual 5 or Dual 8 Circuits) ................ Two 5 GPM/20 LPM Circuits or Two 8 GPM/30 LPM Circuits
Length:............................................................................................................................................. 37.5 in./95.25 cm
Width: .............................................................................................................................................. 25.75 in./65.4 cm
Height: ................................................................................................................................................... 30 in./76.2cm
Weight (Wet): .......................................................................................................................................360 lbs/163 kg
Fuel Tank Capacity: ............................................................................................................................. 4.7 gal./17.8 ltr
Estimated Gas Consumption Per Hour .................................................................................................. 2.5 gal/9.4 ltr
Hydraulic Reservoir Capacity: ............................................................................................................. 3.2 gal./12.1 ltr
Relief Valve “Crack” Setting.............................................................................................................. 2100 psi/145 bar
Full Relief Setting ............................................................................................................................. 2500 psi/172 bar
Nominal Pressure............................................................................................................................. 1500 psi/103 bar
Max Pressure ................................................................................................................................... 2000 psi/138 bar
Circuit Type............................................................................................................................................. Open Center
HTMA/EHTMA Category ........................................................................................................................ Type 1 and 2
POWER UNITS & GAS/FUEL DRIVEN EQUIPMENT: A1. Federal Emission Component Compliance 40CFR part
1060.120 STANLEY warrants all fuel system emission components for 2 years from the date of original purchase
provided there has been no abuse, neglect, modications, or improper maintenance.
Components covered. The emission-related warranty covers all components whose failure would increase the
evaporative emissions. Your emission-related warranty does not cover components whose failure would not
increase evaporative emissions. Coverage under this warranty extends only to the following parts; fuel tank,
fuel cap, fuel hose and vapor hose from the fuel tank to the engine and any connectors that are apart of the fuel
system.
The equipment is designed, built, and equipped so it conforms at the time of sale to the ultimate purchaser and
each subsequent purchaser and is in compliance with 40 C.F.R. 1060.120 standards. The equipment is free from
defects in materials and workmanship that may keep it from meeting these requirements.
CD
HP TWIN8 SPECIFICATIONS
SPECIFICATIONS

HP TWIN8 User Manual ◄ 19
MODEL ENGINE HYDRAULIC
OIL FILTER
OIL FILTER AIR FILTER FUEL FILTER
HP28B02 18384 205053 205057 40408
FILTERS
Coupler Male, Parker SAE.................................................................................................................................72398
Coupler Female, Parker SAE.............................................................................................................................72397
Coupler Set Male & Female, Parker SAE..........................................................................................................72396
Flow and Pressure Tester...................................................................................................................................04182
Hose Assy, 50 ft., with couplers ........................................................................................................................31848
Hose Assy, 25 ft., with couplers ........................................................................................................................31972
ACCESSORIES
ACCESSORIES & FILTERS
ITEM PART
NO QTY. DESCRIPTION
1 202717 1 CASTING HANDLE RELEASE
2 202725 1 SKID PLATE, POWER UNIT
3 202726 1 AXLE BRACE, POWER UNIT
4 202731 1 ASSEMBLY, LOWER FRAME
5 203034 1 TIEDOWN, BATTERY
6 203038 1 ASSY, ROTATION STOP
7 203040 1 ASSY, GRILL, AIR INTAKE
8 203046 1 ASSY, TORQUE ARM
9 203254 1 SUPPORT FOOT ASEMBLY
10 204841 1 BATTERY COVER, 12V PLUG
11 204842 1 ASSEMBLY, FUEL TANK
12 206055 1 ASSY, BRACKET, CARBON CANISTER
13 207988 1 BRACKET, TANK MOUNT
14 207998 1 ASSEMBLY, HYD TANK
15 212798 1 ASSY, UPPER, COMPLETE
2
3
4
56 78 9 10
11
1215
14
13
1
KIT, FRAME/
TANKS/BRACKETS
(P/N-212797)
INCLUDES ITEMS
AT RIGHT AND
PICTURED BELOW.

20 ► HP TWIN8 User Manual
5
2
3
4
6
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
28
29
30
31
1
3
10
10
10
10
10
10
10
26
10
10
10
3
316
7
BB CONNEC-
TION see page
27
AA
CONNECTION
see page 27
Item 24 mounts
inside lower
frame using
fasteners item 10
CC above
CC
DD
DD
Item 19 mounts
inside lower
frame on axles
Item 26 control
block, on page
22 ,mounts to
backside of this
plate.
EE
Item 5 pressure switch (not pictured)
mounts next to engine oil lter.
DD
LOWER FRAME ILLUSTRATION