Greenlee GPU 18-8 Guide

OPERATION, SERVICE AND PARTS
INSTRUCTION MANUAL
999 2008.5 REV 3 6/97
Read and understand this material before operating or
servicing this power unit. Failure to understand how to
safely operate this power unit could result in an
accident causing serious injury or death.
HYDRAULIC
POWER UNIT 18 HP
GPU 18-8

2
GPU 18-8 Hydraulic Power Unit
Additional or replacement manuals may be obtained from your Greenlee Fairmont distributor. When tool is received,
complete the following record:
SERIAL NUMBER: ____________________________
DATE OF PURCHASE: ________________________
WHERE PURCHASED: ________________________
Always mention the tool’s serial number when ordering or writing about parts.
For convenience in ordering, parts are listed by part number, description and quantity. If in doubt as to part needed,
send a full description, sketch, or the part itself with the order. Assemblies are in CAPITAL letters, and include all
component parts listed directly below them and indented to the right. When assemblies can be used, order them to
save time assembling individual parts. Prior arrangements must be made before returning a tool for warranty service.
To insure correct and prompt shipment of parts, always provide the following information when ordering:
1. Quantity of each part wanted 4. Serial Number of tool
2. Part number of item 5. Preferred method of shipment: UPS or air freight
3. Description of part
A person who has not read and does not understand all operating instructions is
not qualified to operate this tool.
Failure to read and understand safety instructions may result in injury or death.
Table Of Contents
OPERATION
Safety Information..............................................................................................................................................3
Description .........................................................................................................................................................4
Identification.......................................................................................................................................................5
Specifications - GPU 18-8 Hydraulic Power Unit .............................................................................................. 6
Specifications - Gasoline Engine .......................................................................................................................6
Recommended Hydraulic Fluids........................................................................................................................ 6
Hoses and Fittings .............................................................................................................................................6
Hose Connections..............................................................................................................................................7
Operation ......................................................................................................................................................8-10
Depressurizing Hydraulic System....................................................................................................................10
MAINTENANCE
Maintenance Schedule ...............................................................................................................................10-11
Battery..............................................................................................................................................................12
Pneumatic Tires ...............................................................................................................................................12
Troubleshooting ..........................................................................................................................................13-15
PARTSPower Unit ..................................................................................................................................................16-17
Hydraulic Components and Piping .............................................................................................................18-19
Battery and Wiring ...........................................................................................................................................20
APPENDICES
Appendix A - SAE J1273 May 1986 ...........................................................................................................21-22

GPU 18-8 Hydraulic Power Unit
3
THIS SYMBOL MEANS:
ATTENTION! BECOME ALERT! YOUR SAFETY IS INVOLVED.
Stop engine before filling fuel tank.
Do not fill fuel tank when engine is
hot. Do not fill fuel tank near an open
flame, sparks, or when smoking. Fuel
is flammable and explosive, and if
ignited will result in severe injury
or death.
Do not run power unit engine in a confined area.
Engine exhaust fumes are toxic. If inhaled, exhaust
fumes can cause injury or death.
Skin Injection Hazard:
High pressure oil easily punctures skin
causing serious injury, gangrene or
death. If injured seek medical help
immediately to remove oil.
Do not use fingers or hands to check
for leaks.
Depressurize hydraulic system before
servicing.
Do not disconnect tool, hoses or fittings while the
power unit is running or if the hydraulic fluid is hot.
Exposure to hot hydraulic fluid can cause serious
burns.
Failure to observe these warnings could result in
severe bodily injury.
Electrical Shock Hazard:
When using this unit near energized
electrical lines, use only certified
non-conductive hoses and proper
personal protective equipment.
Failure to observe this warning could
result in severe injury or death. Wear eye protection when operating
this tool.
Failure to wear eye protection can
result in serious eye injury from flying
debris or hydraulic oil.
Safety is a critical factor in the design of Greenlee Fairmont equipment. The best program starts with a
safety-conscious operator. The information highlighted in this bulletin describes operating practices for the
benefit of the workers who will use our equipment in their daily jobs. Comments from users are appreciated.
• Do not operate power unit without
safety guards in place.
• Keep all parts of the body and
loose clothing away from the
engine fan.
SAVETHESE INSTRUCTIONS

4
GPU 18-8 Hydraulic Power Unit
• Engine, exhaust system, pump, etc. may be hot.
Use caution when working around power unit.
Hot surfaces can cause serious burns.
• Do not let the power unit engine run unattended.
The engine must be monitored so that it can be
shut down immediately in case of a malfunction.
Failure to observe this warning could result in
severe injury or death.
Description
The GPU 18-8 Hydraulic Power Unit is a compact
2000PSI variable flow (5 to 8 GPM) power source for
Open-Center system hydraulic tools. HTMA couplers
are provided for tool connection.
The unit is powered by a 18 HP Briggs & Stratton
air-cooled gasoline engine with electric start.
Other features include a large capacity oil cooler, in-line
flow meter, engine hour meter and pneumatic tires.
SAVETHESE INSTRUCTIONS
• Inspect the hydraulic hoses and couplings every
operating day. Repair or replace if leakage,
cracking, wear, or damage is evident. Damaged
hoses or couplings can fail, resulting in injury or
property damage.
• Use this tool for manufacturer’s intended purpose
only. Use other than that which is described in
this manual could result in injury or property
damage.
• Make sure all bystanders are clear of the work
area when handling, starting, and operating
the tool. Nearby personnel can be injured by
flying or falling debris or by flying parts in the
event of a tool malfunction.
Use appropriate lifting equipment. Make sure all
components used to lift this power unit are rated for
300 lbs (135 kg) and are securely attached between
the power unit and lifting equipment. Inadequate
components may fail and cause the power unit to
fall, resulting in injury or property damage.
Note: Keep all decals clean and legible. Replace decals
when necessary with new decals listed in the
Parts section of this manual.

GPU 18-8 Hydraulic Power Unit
5
Parts of the GPU 18-8 Hydraulic Power Unit
1. Flow Motor/Tachometer 7. Oil Cooler
2. Gasoline Engine 8. Control Panel
3. Retractable Handles 9. Flow ON / OFF Handle
4. Hydraulic Oil Filter 10. Tool Connection - Pressure
5. Fuel Fill Cap 11. Tool Connection - Return
6. Hydraulic Reservoir Cap 12. Serial Number
Figure 2
Figure 1
Identification
11
10
9
86
3 2
12
51
7
4

6
GPU 18-8 Hydraulic Power Unit
Specifications
GPU 18-8 Hydraulic Power Unit ENGLISH METRIC
Weight (Dry) ............................................................................................................... 220 lbs ............99 kg
Weight (Wet) .............................................................................................................. 270 lbs ..........122 kg
Length ......................................................................................................................... 29.5 in ...........75 cm
Width .......................................................................................................................... 22.0 in. ...........56 cm
Height ......................................................................................................................... 26.0 in. ...........66 cm
Fuel Capacity .............................................................................................................4.0 gal. ............15.0 l
Hydraulic Oil Capacity................................................................................................2.8 gal. ............10.5 l
Rated Flow - Variable ............................................................................................. 5-8 GPM .... 19-30 lpm
Pressure Relief Setting ...........................................................................................2000 PSI ..... 137.9 bar
Type of Hydraulic System ........................................................................................................Open-Center
Pressure Port (1/2 M NPT............................................................................................HTMA Male Coupler
Return Port (1/2 M NPT) ......................................................................................... HTMA Female Coupler
Filtration .......................................................................................................................10 Micron (Nominal)
Battery - Utility Type (lead acid battery)
Cranking performance @ 0°F 275 amp, 12 volt
Briggs & Stratton Air Cooled Gasoline Engine Model 422447
Horsepower - Maximum......................................................................................................18@ 3600 RPM
Torque (ft. lbs.) - Maximum.............................................................................................28.6 @ 2600 RPM
Bore............................................................................................................................3.44 in. ...... 87.3 mm
Stroke ......................................................................................................................... 2.28 in. ...... 57.9 mm
Displacement ..................................................................................................... 42.33 cu. in. .......694.0 cc
Hose assemblies and quick-connect couplers are available from Greenlee Fairmont as accessories. SEE
BULLETIN ON GREENLEE FAIRMONT NO-DRIP COUPLERS AND HOSES. CONTACT AUTHORIZED
GREENLEE FAIRMONT DISTRIBUTOR.
Hoses and fittings must comply with the SAE Standard J1273, SAE Recommended Practice for Selection,
Installation, and Maintenance of Hose and Hose Assemblies. See Appendix A.
Failure to observe this warning could result in severe injury or death.
Hoses and Fittings
Recommended Hydraulic Fluids
Electrical Shock Hazard:
When utilizing this tool near energized electrical lines, select and maintain the hydraulic fluid to
meet the minimum dielectric standards required by your safety department. Failure to observe
this warning could result in severe injury or death.
Any non-detergent hydraulic fluid which meets the following specifications or HTMA specifications may be used.
S.U.S. @ 100°F (38°C).......................................................................................................... 140 to 225
@ 210°F (99°C)....................................................................................................... 40 minimum
Flash Point ....................................................................................................... 340°F (170°C) minimum
Pour Point ..........................................................................................................-30°F (-34°C) minimum

GPU 18-8 Hydraulic Power Unit
7
Hose Connections
Do not disconnect tool, hoses or fittings while the power unit is running or if the hydraulic fluid is hot. Expo-
sure to hot hydraulic fluid can cause serious burns.
Figure 3
Hydraulic Schematic
Figure 3 shows the power unit being used with a typical
tool.
Connecting Hoses (See Figures 1, 2 and 3)
1. Stop the power unit hydraulic flow.
2. Connect the return (tank) hose from the power unit
port to the tool return port (T).
Note: Return (tank) hose connection should always
be connected before pressure (supply) hose
connection to prevent pressure buildup inside the
tool.
3. Connect the pressure (supply) hose from the power
unit pressure port to the tool pressure port (P).
Disconnecting Hoses (See Figures 1, 2 and 3)
1. Stop the power unit hydraulic flow.
2. Disconnect the pressure (supply) hose from the
power unit pressure port to the tool pressure port
(P).
Note: Pressure (supply) hose connection should
always be disconnected before return (tank)
hose connection to prevent pressure buildup
inside the tool.
3. Disconnect the return (tank) hose from the power
unit return port to the tool return port (T).
4. To prevent contamination, always install dust caps
over the hydraulic ports of the tool, hoses, and
power unit when disconnected.
TYPICAL
TOOL
PRESSURE
PORT (P)
RETURN
PORT (T)
RETURN
PORT (T)
PRESSURE
PORT (P)
CONTROL VALVE
FLOW
METER
RELIEF
VALVE
2000 PSI
OIL
COOLER
FILTER
(10 micron)
ENGINE
PUMP
POWER
UNIT

8
GPU 18-8 Hydraulic Power Unit
Operation
Stop engine before filling fuel tank.
Do not fill fuel tank when engine is hot.
Do not fill fuel tank near an open flame,
sparks, or when smoking. Fuel is
flammable and explosive and, if ignited,
will result in severe injury or death.
Do not run the power unit engine in a confined
area. Engine exhaust fumes are toxic. If inhaled,
exhaust fumes can cause injury or death.
Electrical Shock Hazard:
When using this unit near energized
electrical lines, use only certified
non-conductive hoses and proper
personal protective equipment.
Failure to observe this warning could
result in severe injury or death.
• Engine, exhaust system, pump, etc. may be hot.
Use caution when working around power unit.
Hot surfaces can cause serious burns.
• Do not let the power unit engine run unattended.
The engine must be monitored so that it can be
shut down immediately in case of a malfunction.
Failure to observe this warning could result in
severe injury or death.
Wear eye protection when operating
this tool.
Failure to wear eye protection can
result in serious eye injury from flying
debris or hydraulic oil.
• Do not operate power unit without
safety guards in place.
• Keep all parts of the body and
loose clothing away from the
engine fan.
Skin Injection Hazard:
High pressure oil easily punctures skin
causing serious injury, gangrene or
death. If injured seek medical help
immediately to remove oil.
Do not use fingers or hands to
check for leaks.
Depressurize hydraulic system
before servicing.
Do not disconnect tool, hoses, or fittings while
the power unit is running or if the hydraulic fluid is
hot. Exposure to hot hydraulic fluid can cause
serious burns.

GPU 18-8 Hydraulic Power Unit
9
4523
6
1
Figure 4
Power Unit Controls
Stopping the Power Unit (See Figure 4)
1. Move the flow ON/OFF lever (1) to the OFF position.
Idle the power unit engine for a few moments. Move
switch (4) to the OFF position.
2. Disconnect the tool hoses from the power unit.
See Hose Connections.
Retractable Handles
The handles on the power unit can be extended when
transporting the power unit or retracted for convenience
when connecting/disconnecting tool hoses, starting
power unit, etc. To use the handles in the extended
position for transport, pull the handles fully out. Rotate
the handles, locking the pins on the handles into the
slots in the cover of the power unit.
Lifting the Power Unit
Position the power unit on firm level ground.
Operation (cont’d)
Stop the power unit engine before lifting. Take care
when attaching the lifting device (chain, strap, etc.) so
as not to damage the power unit.
Use appropriate lifting equipment. Make sure all
components used to lift this power unit are rated for
300 lbs (135 kg) and are securely attached between
the power unit and lifting equipment. Inadequate
components may fail and cause the power unit to
fall, resulting in injury or property damage.
Pre-Start
1. Check engine oil level. Refer to engine Operating
and Maintenance Instructions for correct oil type and
checking instructions.
2. Check fuel level. Refer to engine Operating and
Maintenance Instructions for fuel recommendations.
3. Check hydraulic reservoir oil level. Fill to FULL mark
on dipstick. See Maintenance. See Recommended
Hydraulic Fluids for correct hydraulic fluid.
4. Verify that all current maintenance has been
performed on the power unit. See Maintenance.
5. Connect the tool hoses and tool to the power unit.
See Hose Connections.
Starting the Power Unit (See Figure 4)
1. Move the flow ON / OFF lever (1) to the OFF position.
2. Pull out the choke knob (2).
Note: A warm engine requires less choking than a cold
engine.
3. Pull throttle T-handle (3) out to the fully open
position. Rotate T-handle clockwise to lock in
position and counterclockwise to unlock from
position.
4. Move switch (4) to the ON position.
5. Depress starter button (5) to start engine.
Note: The best starter life is provided by using short
starting cycles of several seconds. Prolonged
cranking, more than 15 seconds per minute, can
damage the starter motor.
6. After the engine has started, reduce engine RPM.
Slowly open choke.
7. Move flow ON / OFF lever (1) to the ON position.
8. It is recommended that the power unit be allowed to
run (idle) for a few minutes to warm the hydraulic
reservoir fluid. Actuating the tool intermittently will
reduce the time required to warm the fluid to an
efficient operating temperature.
9. Using the engine throttle T-handle (1), adjust the
engine RPM to obtain the rated hydraulic oil flow,
5 to 8 GPM. See flow meter (6). Lock the T-handle
throttle in position. DO NOT EXCEED THE
MAXIMUM ALLOWABLE FLOW RATE FOR THE
TOOL BEING USED WITH THE POWER UNIT.
Exceeding the tool’s maximum flow rate could cause
tool failure and personal injury. See your tool
operator’s manual for proper flow rate.

10
GPU 18-8 Hydraulic Power Unit
Maintenance
Hydraulic system must be depressurized when
performing maintenance or repair on the power unit
hydraulic system. Depressurizing the hydraulic system
will also make tool hose connections/disconnections
easier.
1. Stop power unit engine.
2. Move flow ON/OFF lever to the ON position.
System will be depressurized.
3. Before restarting power unit engine, move flow ON/
OFF lever to the OFF position.
Depressurizing Hydraulic System
Skin Injection Hazard:
High pressure oil easily punctures skin
causing serious injury, gangrene or
death. If injured seek medical help
immediately to remove oil.
Do not use fingers or hands to check
for leaks.
Depressurize hydraulic system before
servicing.
Stop engine before filling fuel tank.
Do not fill fuel tank when engine is hot.
Do not fill fuel tank near an open flame,
sparks, or when smoking. Fuel is
flammable and explosive and, if ignited,
will result in severe injury or death.
Do not run the power unit engine in a confined
area. Engine exhaust fumes are toxic. If inhaled,
exhaust fumes can cause injury or death.
Inspect the hydraulic hoses and couplings every
operating day. Repair or replace if leakage, crack-
ing, wear, or damage is evident. Damaged hoses
or couplings can fail, resulting in injury or property
damage.
Do not disconnect tool, hoses, or fittings while
the power unit is running or if the hydraulic fluid is
hot. Exposure to hot hydraulic fluid can cause
serious burns.

GPU 18-8 Hydraulic Power Unit
11
The service life of the power unit will be maximized by
proper care and maintenance. The maintenance
schedule below is recommended.
Note: Change engine oil after the first 5 hours of
operation. Thereafter, change engine oil
according to the Maintenance Schedule.
Every 5 Hours
1. Check engine crankcase oil level. Fill if necessary.
See Oil Recommendations - Engine Manual.
2. Check fuel tank level. Fill if necessary.
See Fuel Recommendations - Engine Manual.
3. See Figure 5. Check hydraulic reservoir oil level.
Fill to FULL mark on dipstick. Do not overfill
reservoir. See Recommended Hydraulic Fluids.
Every 10 Hours
1. Wipe all power unit surfaces clean of grease,
dirt and foreign material.
2. Inspect the hydraulic system hoses and fittings
for signs of leaks, cracks, wear, or damage.
Replace if necessary.
Every 25 Hours
1. Service engine air cleaner/pre-cleaner.
See Engine Manual.
Every 50 Hours
1. Change engine crankcase oil and oil filter.
See Engine Manual.
Every 100 Hours or Once Yearly
1. Drain hydraulic reservoir oil. Clean and flush
reservoir. Change hydraulic oil filter. Fill reservoir
with new, clean hydraulic oil. See Recommended
Hydraulic Fluids. Operate power unit to circulate oil
through the hydraulic system. Stop power unit.
Recheck hydraulic oil level. Fill reservoir to the
FULL mark on the dipstick. Do not overfill reservoir.
See Figure 5.
2. Service engine air cleaner cartridge.
See Engine Manual.
3. Perform a detailed inspection of the system hoses
and fittings as stated in Appendix A - S.A.E
Standard J1273, May 1986. Replace the hoses
and/or fittings if necessary.
Figure 5
Hydraulic Reservoir Dipstick
F
EOPERATING AREA
Maintenance (cont’d)

12
GPU 18-8 Hydraulic Power Unit
Maintenance (cont’d)
Battery
Stop engine when checking battery
electrolyte level. Do not check or fill
battery electrolyte level near an open
flame, sparks, or when smoking.
Battery fumes are flammable and
explosive, and if ignited will result in
severe injury or death.
When working on or around the battery:
• Remove jewelry, wristwatches and any other
conductive items. The current produced by the
battery can cause severe burns.
• Wear eye protection and gloves and handle the
battery carefully. Contact with battery acid can
cause severe burns or blindness.
Failure to observe these warnings could result in
severe injury or death.
Pneumatic Tires
Inflate power unit tires to the recommended pressure
printed on the sidewalls of the tires. Do not exceed tire
manufacturer’s recommended maximum pressure
printed on the sidewalls of the tires or rim
manufacturer’s recommended maximum pressure
stamped on the rim, whichever is lower.
Battery Maintenance and Replacement
Battery is a utility style, lead acid type. Check battery
electrolyte level at least once a month. Stop power unit
engine when checking battery electrolyte level. If
electrolyte level is low, fill to required level using distilled
water only. Clean battery terminals and cable clamps
when required. After cleaning, coat battery terminals and
cable clamps with grease or other suitable product to
reduce corrosion. When battery replacement becomes
necessary, it is recommended that replacement battery
should meet or exceed original battery specifications;
amps, cranking power, etc.

GPU 18-8 Hydraulic Power Unit
13
Troubleshooting
Before You Begin
1. Any tool used with this power unit must be an
Open-Center system type tool.
2. Verify that the pressure and return hoses are
connected properly to the power unit and tool ports.
3. Power unit reservoir must be filled to the FULL mark
with hydraulic fluid.
4. Start the power unit hydraulic oil flow. All separate
shut-off devices must be opened (on/off valves, etc.)
5. After verifying all of the above, check the tool to see
if it operates.
If the tool does not operate, it will be necessary to
pinpoint the power unit, tool, or hoses and the
problem area. The following steps will help to
determine the problem area.
Determine the Problem Area
1. Stop the power unit hydraulic oil flow. Disconnect the
existing tool from the hoses and power unit.
2. Connect a known working tool to the hoses and
power unit. See the tool’s operator’s manual for
correct hookup procedure. Start the power unit
hydraulic oil flow.
If the known working tool operates, the problem is in
the disconnected tool. See the tool operator’s
manual for troubleshooting.
If the known working tool does not operate, the
problem is likely to be in the hoses or the power unit.
Proceed to Step 3.
3. Stop the power unit hydraulic oil flow. Disconnect the
existing hoses from the known working tool and
power unit.
4. Connect a different set of hoses to the known
working tool and power unit. Start the power unit
hydraulic oil flow.
If the known working tool operates with the different
set of hoses, the problem is in the disconnected
hoses.
If the known working tool does not operate, the
problem is in the power unit. See the troubleshooting
charts in this operator’s manual.

14
GPU 18-8 Hydraulic Power Unit
Troubleshooting
Engine does not turn over. Battery weak or dead. Recharge or replace battery.
Battery cables corroded. Clean battery cable terminals or
replace cables.
Electrical short, broken wire or loose Check wires and connections.
connection. Repair or replace.
Engine starter inoperative. Repair or replace starter.
See engine operator’s manual.
Engine turns over, but does No fuel in tank. Fill fuel tank.
not start. ON/OFF switch in the OFF position. Move switch to the ON position.
Flow ON/OFF handle in the ON Move handle to the OFF position.
position.
Electrical short, broken wire or loose Check wires and connections.
connection. Repair or replace.
See engine operator’s manual.
Engine lacks power, runs rough, See engine operator’s manual.
backfires, etc.
Tool used with power unit is Flow ON/OFF valve in the OFF position. Move flow ON/OFF valve to ON
inoperative. position.
Tool is a Closed-Center system type. Use only Open-Center system tools.
No hydraulic fluid in system or fluid Check fluid level. Fill to FULL mark.
level low. Check system for leaks.
Incorrect hydraulic fluid viscosity. Use fluid viscosity recommended.
See Recommended Hydraulic Fluids.
Hydraulic filter needs service. Replace hydraulic filter.
Power unit components (pump, valve, Repair or replace components.
etc.) worn or damaged.
Engine output insufficient. Engine See engine operator’s manual.
needs adjustment, tune-up, etc.
PROBLEM PROBABLE CAUSE POSSIBLE REMEDY

GPU 18-8 Hydraulic Power Unit
15
Troubleshooting
Tool used with power unit Hydraulic fluid cold. Viscosity of oil may be too high at
operates erratically. start of tool operation. Allow oil to
warm to operating temperature.
Actuating tool intermittently will
reduce time required to warm oil
to an efficient operating temperature.
Hydraulic fluid level low. Check fluid level. Fill to FULL mark.
Check system for leaks.
Incorrect hydraulic fluid viscosity. Use fluid viscosity recommended.
See Recommended Hydraulic Fluids.
Air in system. Check pump suction line for damage
or loose clamps. Tighten clamps or
replace components if necessary.
Fill reservoir.
Hydraulic oil flow (GPM) incorrect for Adjust engine RPM to achieve
tool being used. correct flow (GPM) for tool being used.
Hydraulic filter needs service. Replace hydraulic filter.
Power unit components (pump, valve, Repair or replace components.
etc.) worn or damaged.
Engine output insufficient. Engine See engine operator’s manual.
needs adjustment, tune-up, etc.
Tool used with power unit Hydraulic fluid level low. Check fluid level. Fill to FULL mark.
feels hot. Check system for leaks.
Hydraulic fluid viscosity too light. Use fluid viscosity recommended.
See Recommended Hydraulic Fluids.
Hydraulic fluid dirty. Drain reservoir, flush and fill with
clean fluid. Change filter.
Hydraulic oil flow (GPM) incorrect Adjust engine RPM to achieve
for tool being used. correct flow (GPM) for tool being
used.
Tool used with power unit Hydraulic flow to tool reversed. Reverse flow to tool. Check for
operates backward. valve in system that has reversed
flow. Check hoses for proper flow.
Hydraulic pressure and return lines Disconnect hoses. Reverse
connected to incorrect power unit or couplers. Reconnect hoses to
tool ports. proper power unit and tool ports.
PROBLEM PROBABLE CAUSE POSSIBLE REMEDY

16
GPU 18-8 Hydraulic Power Unit
GPU 18-8 Hydraulic Power Unit
31 32 33
34
2b
2a
30
55
29
56
25
40, 41 39
26, 38 36
35
25, 26, 28
37
59
27
62
24
25, 26, 28
17
18, 19
20
21, 22, 23
9, 10, 11
12
13
2
768
34, 5 60
14, 15, 16
43 42 25, 26 1
50
49
44
45
25, 26, 28
63
46 25, 26, 28 48 47
63 25
51 28, 52 26, 28, 53
63 54
63
6a

GPU 18-8 Hydraulic Power Unit
17
GPU 18-8 Hydraulic Power Unit
KEY CODE DESCRIPTION QTY.
1 155789 Frame ................................................................................................................................. 1
2 F024643 GASOLINE ENGINE (Briggs & Stratton)............................................................................ 1
2a FOR4444 Switch, Toggle............................................................................................................... 1
2b FOR4445 Switch, Push Button ...................................................................................................... 1
3 155825 Adapter, Fan....................................................................................................................... 1
4 F010344 Cap Screw, 5/16 x 1" Socket Head .................................................................................... 4
5 F011527 Lock Washer, 5/16" ............................................................................................................ 4
6 F022683 Fan ..................................................................................................................................... 1
6a F011749 Set Screw ........................................................................................................................... 2
7 079423 Square Key, 3/16 x 1-1/8" .................................................................................................. 1
8 F024642 Oil Cooler ........................................................................................................................... 1
9 F024646 Coupling ............................................................................................................................. 1
10 F024847 Coupling ............................................................................................................................. 1
11 F024697 Coupling Spider.................................................................................................................. 1
12 149960 Square Key, 1/4 x 1-3/4" .................................................................................................... 1
13 F012205 90°Elbow, 3/8 F NPT x 3/8 M NPT.................................................................................... 1
14 F010881 Cap Screw, 5/16 x 3-1/4" Hex Head................................................................................... 4
15 F014476 Hex Stop Nut, 5/16"............................................................................................................ 4
16 F001362 Wrought Washer, 5/16" ...................................................................................................... 4
17 F024644 Pump Adapter .................................................................................................................... 1
18 F003912 Cap screw, 7/16 x 1-1/4 Hex Head .................................................................................... 4
19 F001291 SAE Lock Washer, 7/16".................................................................................................... 4
20 F024640 PUMP ................................................................................................................................. 1
F024698 Packing Kit .................................................................................................................... 1
21 F013308 Cap Screw, 3/8 x 1-1/2" Socket Head................................................................................ 2
22 F001025 SAE Lock Washer, 3/8" ...................................................................................................... 2
23 F009681 Washer, 3/8"....................................................................................................................... 2
24 F021992 Roll Pin, 1/4 x 1-1/4"........................................................................................................... 2
25 F024672 Cap Screw, 1/4 x 1-1/2" Button Skt Hd ............................................................................ 15
26 F013588 Light Hex Stop Nut, 1/4" ................................................................................................... 21
27 49130 Tube Assembly................................................................................................................... 1
28 F001050 Washer, 1/4"..................................................................................................................... 17
29 49133 Control Panel...................................................................................................................... 1
30 F024678 Fuel Tank Cap.................................................................................................................... 1
31 F024674 Choke Cable....................................................................................................................... 1
32 F024675 Throttle Cable..................................................................................................................... 1
33 F024679 Oil Reservoir Cap ............................................................................................................... 1
34 F003085 Cap Screw, 1/4 x 1/2" Hex Head........................................................................................ 2
35 152339 Roll Pin, 1/8 x 1" ................................................................................................................. 2
36 155834 Leg ..................................................................................................................................... 2
37 158150 Pad, Leg ............................................................................................................................. 2
38 F009667 Cap Screw, 1/4 x 1-1/2" Hex Head..................................................................................... 4
39 155777 Rubber Hose, 1/4" ID Fuel ................................................................................................. 1
40 F016087 Connector, 1/8 M NPT........................................................................................................ 1
41 F009188 45°Elbow, 1/8 M NPT 1/8 F NPT....................................................................................... 1
42 49132 Handle ................................................................................................................................ 2
43 F011458 Hand Grip ........................................................................................................................... 2
44 155832 Bar...................................................................................................................................... 1
45 F002355 Cap Screw, 1/4 x 3/4" Hex Head........................................................................................ 2
46 155823 Battery Holder .................................................................................................................... 1
47 F022740 Wheel ...................................................................................................................................
48 F001104 Cotter Pin, 1/8 x 1" ............................................................................................................. 4
49 F005185 Clip ..................................................................................................................................... 2
50 155820 Trim .................................................................................................................................... 1
51 49131 Shroud, Fan/Cooler ............................................................................................................ 1
52 155835 Guard ................................................................................................................................. 1
53 F024673 Cap Screw, 1/4 x 1-3/4 Button Head.................................................................................. 2
54 49128 Fuel Tank ........................................................................................................................... 1
55 135326 Decal, Danger - Stop Engine.............................................................................................. 1
56 48902 Decal, Control Panel .......................................................................................................... 1
57 158157 Wide Axle Assembly........................................................................................................... 2
58 F012367 Cap Screw, 1/4 x 1-3/4 Hex Head...................................................................................... 4
59 F011164 Cap Screw, 1/2 x 1" Socket head....................................................................................... 2
60 F009288K Snap Ring, External ........................................................................................................... 1
61 F013588 Hex Lock Nut, 1/4............................................................................................................... 4
62 48903 Decal .................................................................................................................................. 1
63 48837 Decal .................................................................................................................................. 4

18
GPU 18-8 Hydraulic Power Unit
GPU 18-8 Hydraulic Power Unit
Hydraulic Components and Piping
OIL
COOLER
11
20 27
2
4USE SILICON SEALER
3
1
26
12
16
5
6
17
24
25
17 21 1129 15
HYDRAULIC
PUMP
28
18
11
13
17
2219
7,8,9 10 14
TO PUMP

GPU 18-8 Hydraulic Power Unit
19
GPU 18-8 Hydraulic Power Unit
Hydraulic Components and Piping
KEY CODE DESCRIPTION QTY.
1 49129 Hydraulic Reservoir ..............................................................................................................1
2 F008544 Level Seal Plug, 1/8 M NPT ................................................................................................. 1
3 F024683 FILTER .................................................................................................................................1
F024680 Replacement Filter Element .......................................................................................... 1
4 F002355 Cap Screw, 1/4 x 3/4" Hex Head..........................................................................................2
5 155830 Manifold................................................................................................................................ 1
6 F024682 Rotary Valve......................................................................................................................... 1
7 F009825 Cap Screw, 1/4 x 1" Hex Head............................................................................................. 4
8 F007022 Hex Nut, 1/4" ........................................................................................................................4
9 F013588 Light Hex Stop Nut, 1/4" ....................................................................................................... 4
10 F015627 Hose Clip.............................................................................................................................. 4
11 F012147 Hose Clamp..........................................................................................................................4
12 F022988 Hose Clamp..........................................................................................................................2
13 F022687 Relief Valve .......................................................................................................................... 1
14 F024695 90°Elbow, 3/4 M NPT x 3/4 ID Hose ................................................................................... 2
15 F024676 90°Elbow, 1/2 F NPT x 7/8 M STR...................................................................................... 1
16 F024677 90°Elbow, 1-1/16 M JIC x 1 Hose ....................................................................................... 1
17 F013468 90°Elbow, 1/2 M NPT x 1/2 F NPT Street ........................................................................... 2
18 170080 Plastic Coil Sleeve............................................................................................................ 2.8 ft.
19 F011243 Hex Nipple, 1/2 M NPT x 1/2 M NPT....................................................................................2
20 F022736 Adapter, 3/4 M NPT x 1/2 F NPT .........................................................................................1
21 F030031 Fitting 1/2 M NPT x 3/4 Hose ............................................................................................... 1
22 F018353 Level Seal Plug, 1/4 M NPT ................................................................................................. 2
24 F020196K Female Quick Connector...................................................................................................... 1
25 F020197K Male Quick Connector..........................................................................................................1
26 155778 Hose, 1 ID x 6-1/2 Long .......................................................................................................1
27 155779 Hose, 3/4 ID x 42 Long.........................................................................................................1
28 155780 Hose, 3/4 ID x 38 Long.........................................................................................................1
29 155781 Hose, 18" - 1/2 M NPT x 1/2 M NPT Swivel ......................................................................... 1

20
GPU 18-8 Hydraulic Power Unit
GPU 18-8 Hydraulic Power Unit
Battery and Wiring
KEY CODE DESCRIPTION QTY.
1 F024696 12 Volt Battery..................................................................................................................... 1
2 F001684 Carriage Bolt, 1/4 x 1" ......................................................................................................... 1
3 F007022 Hex Nut, 1/4" ....................................................................................................................... 2
4 156754 Wire Assembly .................................................................................................................... 1
5 156654 Wire Assembly .................................................................................................................... 1
6 155785 Wire Assembly .................................................................................................................... 1
7 F020627 Battery Hold-Down .............................................................................................................. 1
9 F030028 Machine Screw, #8 x 1-1/4"................................................................................................. 2
10 F030029 Lock Washer, #8 ................................................................................................................. 2
11 F005273 Hex Nut, #8 ......................................................................................................................... 2
12 170061 Tube .................................................................................................................................... 2
13 F030027 Hour Meter/Tach ................................................................................................................. 1
GROUND TO ENGINE
MOUNTING BOLT
2,3
1
EXISTING WIRE
“RECHARGING CIRCUIT”
GROUND TO EXISTING
STUD ON ENGINE
4
ON/OFF SWITCH
STARTER SWITCH
EXISTING CABLE
ATTACH TO STARTER TERMINAL
7
GROUND TO
ENGINE BOLT
6
EXISTING SPARK PLUG
BATTERY
BATTERY
BATTERY
9,10,11,12
13