Stanley MHP3 User manual

© 2012 Stanley Black & Decker, Inc.
New Britain, CT 06053
U.S.A.
69887 11/2012 Ver. 4
Safety, OperatiOn and Maintenance
USer ManUaL
MHP3
DIESEL
tracHOrSe

MHP3 Diesel User Manual ◄ 3
TABLE OF CONTENTS
SERVICING: This manual contains safety, operation, and routine maintenance instructions. Stanley Hydraulic
Tools recommends that servicing of hydraulic tools, other than routine maintenance, must be performed by an au-
thorized and certied dealer. Please read the following warning.
For the nearest authorized and certied dealer, call Stanley Hydraulic Tools at the number listed on the back of this
manual and ask for a Customer Service Representative.
WARNING
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.
IMPORTANT
To ll out a Product Warranty Recording form, and for information on your warranty,
visit Stanleyhydraulic.com and select the Warranty tab.
(NOTE: The warranty recording form must be submitted to validate the warranty).
SAFETY SYMBOLS ..................................................................................................................................................4
SAFETY PRECAUTIONS..........................................................................................................................................5
TOOL STICKERS & TAGS ........................................................................................................................................7
HOSE TYPES............................................................................................................................................................8
HOSE RECOMMENDATIONS ..................................................................................................................................9
HTMA REQUIREMENTS.........................................................................................................................................10
HOSE & FITTING CONNECTIONS FOR SINGLE TOOL CIRCUIT ....................................................................... 11
HOSE & FITTING CONNECTIONS FOR DUAL TOOL CIRCUIT ...........................................................................12
OPERATION............................................................................................................................................................13
MAINTENANCE ......................................................................................................................................................19
TESTING & TROUBLESHOOTING ........................................................................................................................20
TROUBLESHOOTING ............................................................................................................................................21
SPECIFICATIONS...................................................................................................................................................22
ACCESSORIES.......................................................................................................................................................22
MHP3 DIESEL MAJOR ASSY PARTS ILLUSTRATION..........................................................................................23
MHP3 DIESEL MAJOR ASSY PARTS LIST............................................................................................................24
MHP3 DIESEL HOSE & FITTINGS ILLUSTRATION – A ........................................................................................25
MHP3 DIESEL HOSE & FITTINGS PARTS LIST – A..............................................................................................26
MHP3 DIESEL HOSE & FITTINGS ILLUSTRATION & PARTS – B........................................................................27
MHP3 DIESEL POWER UNIT FRAME ILLUSTRATION.........................................................................................28
MHP3 DIESEL POWER UNIT FRAME PARTS LIST ..............................................................................................29
MHP3 DIESEL POWER UNIT ENGINE ILLUSTRATION & PARTS .......................................................................30
MHP3 DIESEL POWER UNIT RESERVOIR ILLUSTRATION & PARTS ...............................................................31
MHP3 DIESEL POWER UNIT VALVE ILLUSTRATION & PARTS .......................................................................... 32

4 ► MHP3 Diesel User Manual
SAFETY SYMBOLS
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 mainte-
nance personnel.
Safety symbols and signal words, as shown below, are used to emphasize all operator, maintenance and repair ac-
tions 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.
DANGER
This safety alert and signal word indicate an imminently hazardous situation
which, if not avoided, will result in death or serious injury.
WARNING
This safety alert and signal word indicate a potentially hazardous situation
which, if not avoided, could result in death or serious injury.
CAUTION
This safety alert and signal word indicate a potentially hazardous situation
which, if not avoided, could result in death or serious injury.
CAUTION
This signal word indicates a potentially hazardous situation which, if not avoid-
ed, may result in property damage.
NOTICE
This signal word indicates a situation which, if not avoided, will result in damage
to the equipment.
IMPORTANT
This signal word indicates a situation which, if not avoided, may result in dam-
age to the equipment.

MHP3 Diesel User Manual ◄ 5
SAFETY PRECAUTIONS
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 machine.
These safety precautions are given for your safety. Re-
view them carefully before operating the machine and
before performing general maintenance or routine ser-
vice.
Supervising personnel should develop additional pre-
cautions relating to the specic work area and local
safety regulations. If so, place the added precautions in
the space provided in this manual.
If you have not read this manual or the engine manu-
al, you are not ready to operate the MHP3. Read and
understand this manual and any stickers and tags
attached to the machine before operation. Failure to
do so can result in equipment damage, personal in-
jury, or death.
• Operate the machine in a work area WITHOUT BY-
STANDERS. The operator must be familiar with all
prohibited work areas such as excessive slopes and
dangerous terrain conditions.
• DO NOT operate the machine ACROSS excessive
slopes or unstable terrain where “tip over” is a hazard.
• DO NOT operate the machine in conned areas
where there may be a risk of crushing the operator
between the machine and another object.
• DO NOT OPERATE THE TRACHORSE IN EN-
CLOSED SPACES. Inhalation of engine exhaust
can be fatal.
• DO NOT WEAR LOOSE CLOTHING that can get
entangled in the working parts of the machine or hy-
draulic tools.
• DO NOT add fuel to the machine while it is running
or still hot.
• DO NOT operate the machine if a fuel odor is pres-
ent.
• DO NOT operate the machine within 3.3 ft./1 m of
buildings, obstructions, or ammable objects.
• Allow the engine to cool before storing the machine
in an enclosure.
• DO NOT RIDE ON, OR ALLOW ANYONE ELSE TO
RIDE ON, THE MACHINE AT ANY TIME.
• Establish a training program for all operators to en-
sure safe operation.
• DO NOT operate the machine unless thoroughly
trained or under the supervision of an instructor.
• Always wear safety equipment such as goggles,
ear, head protection, respiratory and safety shoes
at all times when operating the TracHorse and hy-
draulic tools.
• DO NOT inspect or clean the machine while the en-
gine is running. Accidental engagement of the ma-
chine can cause serious injury or death.
• Wear a homologated respirator when cutting or
breaking masonry, concrete, asbestos and other
materials that produce dust.
• The hydraulic circuit control levers must be in the
“OFF”position when coupling or uncoupling hydrau-
lic tools. Wipe all couplers clean before connecting.
Use only lint-free cloths. Failure to do so may result
in damage to the quick couplers and cause over-
heating of the hydraulic system.
• Before operating hydraulic tools, read and under-
stand the operation manual furnished with the tool.
• DO NOT operate a damaged, or improperly adjusted,
machine. DO NOT operate with guards removed.
• DO NOT weld or cut with an acetylene torch any
surface or component of the equipment. Consult
with the Stanley factory before performing any weld-
ing or acetylene cutting of the equipment.
• Prevent possible personal injury or equipment dam-
age by having all repair, maintenance and service
performed only by authorized and properly trained
personnel.
• DO NOT exceed the rated limits of the equipment
or use the equipment for applications beyond its de-
sign capacity.
• Always keep critical markings, such as labels and
warning stickers legible.
• Always replace parts with replacement parts recom-
mended by Stanley Hydraulic Tools.
• Keep all body parts away from working parts of the
TracHorse.
• Be aware of surrounding hazards. Noise created by
the TracHorse and the tools it operates may mask
early indications of approaching hazards.

6 ► MHP3 Diesel User Manual
SAFETY PRECAUTIONS
• Only use the TracHorse 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 op-
erating the TracHorse and tools. DO NOT operate if
affected by medications, drugs or alcohol.
• Keep clear of hot (engine) parts and exhaust.
• DO NOT use ammable solvents around the engine.
• DO NOT reverse tool rotation by changing uid ow
direction.
• Always use hose and ttings rated for 2500 psi/172
bar with a 4 to 1 safety factor. Be sure all hose con-
nections are tight.
• Be sure all hoses are correct for current ow direc-
tion to and from the tool being used.
• DO NOT inspect hoses and ttings for leaks by us-
ing bare hands. “Pin-hole” leaks can penetrate the
skin.
• DO NOT operate tools if oil temperature exceeds
140 °F/60 °C. Operation at high temperatures can
cause higher than normal temperatures at the tools
which can result in operator discomfort.
• Disconnect battery before servicing electrical com-
ponents. Electrocution or burns could result from
improper contact.

MHP3 Diesel User Manual ◄ 7
TOOL STICKERS & TAGS
68335
Throttle Sticker
68334
Limit Engine Speed Sticker
47352
Lift Point Sticker
Usein well ventilatedareas only. Exhaust contains chemicals known to the
state of California to cause cancer,birth defects, and other reproductive
harm.
Contact with high pressure fluid at leak or burst resulting from
improper handling, operation, or maintenance will causeoil injection
to body.
All operators mustread, understand, and followALL safteyprecautions
and operatinginstructions found in owners manual before operatingtool.
Engine,exhaust, and other surfaces of tool may be hot.Avoid accidental
contact with hot surfaces.Allowtool to cool before maintenance or
storage.
59126
Dash Decal
28045
Combiner Knob Sticker
35677
Start Sticker
28046
Carbon Monoxide Sticker
Hot Parts Sticker
P/N-28047
29133
California Proposition Sticker
Refer to the parts illustrations for correct location of stickers.
51297
Fluid Level Sticker
HYDRAU-
LIC FLUID
35686
Hydraulic Fluid Sticker

8 ► MHP3 Diesel User Manual
HOSE TYPES
The rated working pressure of the hydraulic hose must be equal to or higher than the relief valve setting on the hy-
draulic 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 certi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 reinforce-
ment, 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 in-
ner tube, synthetic ber braid reinforcement, and weather resistant thermoplastic or synthetic rubber cover. This
hose is not certi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 Hydraulic
Tools. 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 PROP-
ERLY 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 HOSE AND FIT-
TING 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

MHP3 Diesel User Manual ◄ 9
HOSE RECOMMENDATIONS
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 recommenda- tions are intended to keep return line pressure (back pressure) to a minimum acceptable lev- el to ensure maximum tool performance. This chart is intended to be used for hydraulic tool applications only based on Stanley Hy- draulic Tools 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 maxi- mum hydraulic system relief valve setting. All hydraulic hose must meet or exceed specications as set forth by SAE J517.
PRESSURE
RETURN
<<< FLOW
FLOW >>>

10 ► MHP3 Diesel User Manual
HTMA / EHTMA REQUIREMENTS
Flow Range
Nominal Operating Pressure
(at the power supply outlet)
System relief valve setting
(at the power supply outlet)
Maximum back pressure
(at tool end of the return hose)
Measured at a max. uid viscosity of:
(at min. operating temperature)
Temperature: Sufcient heat rejection
capacity to limit max. uid temperature to:
(at max. expected ambient temperature)
Min. cooling capacity at a temperature
difference of between ambient and uid
temps
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
Min. full-ow ltration
Sized for ow of at least:
(For cold temp. startup and max.
dirt-holding capacity)
Hydraulic uid Petroleum based
(premium grade, anti-wear, non-conductive)
Viscosity (at min. and max. operating temps)
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
4-6 gpm 7-9 gpm 9-10.5 gpm 11-13 gpm
(15-23 lpm) (26-34 lpm) (34-40 lpm) (42-49 lpm)
1500 psi 1500 psi 1500 psi 1500 psi
(103 bar) (103 bar) (103 bar) (103 bar)
2100-2250 psi 2100-2250 psi 2200-2300 psi 2100-2250 psi
(145-155 bar) (145-155 bar) (152-159 bar) (145-155 bar)
250 psi 250 psi 250 psi 250 psi
(17 bar) (17 bar) (17 bar) (17 bar)
400 ssu* 400 ssu* 400 ssu* 400 ssu*
(82 centistokes) (82 centistokes) (82 centistokes) (82 centistokes)
140° F 140° F 140° F 140° F
(60° C) (60° C) (60° C) (60° C)
3 hp 5 hp 6 hp 7 hp
(2.24 kW) (3.73 kW) (5.22 kW) (4.47 kW)
40° F 40° F 40° F 40° F
(22° C) (22° C) (22° C) (22° C)
25 microns 25 microns 25 microns 25 microns
30 gpm 30 gpm 30 gpm 30 gpm
(114 lpm) (114 lpm) (114 lpm) (114 lpm)
100-400 ssu* 100-400 ssu* 100-400 ssu* 100-400 ssu*
(20-82 centistokes)
HTMA
HYDRAULIC SYSTEM REQUIREMENTS
NOTE: These are general hydraulic system requirements. See tool specication page for tool specic requirements
TOOL TYPE
HTMA / EHTMA REQUIREMENTS
TYPE I TYPE II TYPE III
TYPE RR
BCD
3.5-4.3 gpm 4.7-5.8 gpm 7.1-8.7 gpm 9.5-11.6 gpm 11.8-14.5 gpm
(13.5-16.5 lpm) (18-22 lpm) (27-33 lpm) (36-44 lpm) (45-55 lpm)
1870 psi 1500 psi 1500 psi 1500 psi 1500 psi
(129 bar) (103 bar) (103 bar) (103 bar) (103 bar)
EHTMA
HYDRAULIC SYSTEM
REQUIREMENTS
CLASSIFICATION
Flow Range
Nominal Operating Pressure
(at the power supply outlet)
System relief valve setting
(at the power supply outlet) 2495 psi 2000 psi 2000 psi 2000 psi 2000 psi
(172 bar) (138 bar) (138 bar) (138 bar) (138 bar)

HOSE FITTINGS & CONNECTIONS
MHP3 Diesel User Manual ◄ 11
HOSE & FITTING CONNECTIONS FOR SINGLE TOOL
CIRCUIT
HTMA 3/8 INCH FEMALE QUICK DISCONNECT
COUPLER (STANLEY P/N 03972 COUPLER BODY or
STANLEY P/N 03971 COUPLER SET – nose & body)
1/2 INCH I.D. HOSE, 25 FT TO 50 FT LONG.
(FOR 25 FEET, STANLEY P/N 31972 HYDRAULIC HOSE
or STANLEY P/N 58633 TWINNED HYDRAULIC HOSES
or 58451 2-wire braid HYDRAULIC HOSE)
(FOR 50 FEET, STANLEY P/N 31848 HYDRAULIC HOSE
or STANLEY P/N 58634 TWINNED HYDRAULIC HOSES
or 58448 2-wire braid HYDRAULIC HOSE)
1/2 INCH MALE PIPE HOSE END
HTMA 1/2 INCH MALE QUICK DISCONNECT COUPLER
(STANLEY P/N 03975 COUPLER NOSE or STANLEY P/N
03974 COUPLER SET – nose & body)
HTMA 3/8 INCH MALE QUICK DISCONNECT COUPLER
(STANLEY P/N 03973 COUPLER NOSE or STANLEY P/N
03971 COUPLER SET – nose & body)
HTMA 1/2 INCH FEMALE QUICK DISCONNECT
COUPLER (STANLEY P/N 03976 COUPLER BODY or
STANLEY P/N 03974 COUPLER SET – nose & body)
CAUTION
Before disconnecting hydraulic tools, ensure the tool
circuit control levers are in the down position and the
throttle is in the "SLOW" position.

HOSE FITTINGS & CONNECTIONS
12 ► MHP3 Diesel User Manual
HOSE & FITTING CONNECTIONS FOR DUAL TOOL
CIRCUIT
HTMA 3/8 INCH FEMALE QUICK DISCONNECT
COUPLER (STANLEY P/N 03972 COUPLER BODY or
STANLEY P/N 03971 COUPLER SET – nose & body)
HTMA 3/8 INCH MALE QUICK DISCONNECT
COUPLER (STANLEY P/N 03973 COUPLER NOSE or
STANLEY P/N 03971 COUPLER SET – nose & body)
1/2 INCH I.D. HOSE, 25 FT TO 50 FT LONG.
(FOR 25 FEET, STANLEY P/N 31972 HYDRAULIC
HOSE or STANLEY P/N 58633 TWINNED HYDRAULIC
HOSES or 58451 2-wire braid HYDRAULIC HOSE)
(FOR 50 FEET, STANLEY P/N 31848 HYDRAULIC
HOSE or STANLEY P/N 58634 TWINNED HYDRAULIC
HOSES or 58448 2-wire braid HYDRAULIC HOSE)
1/2 INCH MALE PIPE HOSE END
HTMA 1/2 INCH MALE QUICK DISCONNECT COU-
PLER (STANLEY P/N 03975 COUPLER NOSE or
STANLEY P/N 03974 COUPLER SET – nose & body)
HTMA 1/2 INCH FEMALE QUICK DISCONNECT COU-
PLER (STANLEY P/N 03976 COUPLER BODY or
STANLEY P/N 03974 COUPLER SET – nose & body)
CAUTION
Before disconnecting hydraulic tools, ensure the tool
circuit control levers are in the down position and the
throttle is in the "SLOW" position.

MHP3 Diesel User Manual ◄ 13
OPERATION
PREPARATION FOR USE
ENGINE
1.
NOTICE
Do not operate the TracHorse until you have read
the engine operating and maintenance instructions
manual furnished in addition to this manual.
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 oil as specied in the
engine operating and maintenance manual.
2.
NOTICE
The engine oil sump must never be overlled.
Overlling can cause the engine to overheat and
cause crankshaft seal damage.
Engine Fuel Level
Check the fuel level. If low, ll with DF-1 or DF-2
diesel fuel (A.S.T.M. D975-66T No. 1 or no. 2 dark).
NOTICE
Shut the engine off before attempting to add fuel to
the fuel tank. Do not remove the fuel cap while the
engine is running. Do not add fuel to the tank while
the engine is hot. Do not ll the fuel tank to a point of
overowing.
HYDRAULIC FLUID
Check the sight gauge in the hydraulic uid reservoir for
the proper uid level.
Use uids meeting the following specications.
VISCOSITY (FLUID THICKNESS)
U.S.METRIC
50 °F 450 SSU Maximum10 °C 95 Centistokes
100 °F 130–200 SSU38 °C 27–42 C.S.
140 °F 85 SSU Minimum60 °C 16.5 C.S. Minimum
Pour Point: -10 °F/-23 °C Minimum (for cold startup)
Viscosity Index: (ASTM D-2220) 140 Minimum
Demulsibility: (ASTM D-1401) 30 Minutes Maximum
Flash Point: (ASTM D-92) 340 °F/171 °C Minimum
Rust Inhibition: (ASTM D-665 A & B) Pass
Oxidation: (ASTM D-943) 1000 Hours Minimum
Pump Wear Test: (ASTM D-2882) 60 mg Maximum
The following uids work well over a wide temperature
range at startup, allow moisture to settle out and resist
biological growth that may occur in cool operating hy-
draulic circuits. These uids are recommended by Stan-
ley Hydraulic Tools. Other uids that meet or exceed the
specications of these uids may also be used.
• Chevron AW-MV-32
• Exxon “Univis” J-26
• Mobil D.T.E. 13
• Gulf “Harmony” AW-HVI-150-32
• Shell “Tellus” T-32
• Texaco “Rando” HD-AZ
• Union “Unax” AW-WR-32
BATTERY
The supplied battery is maintenance free.
NOTE:
Before starting the engine make sure the tool circuit
switch is in the OFF position.
DUAL CIRCUIT OPERATION
Facing the panel, the male quick disconnect ttings are
the PRESSURE FLUID OUT tting. The female quick
disconnect ttings are the RETURN FLUID IN (RE-
TURN) tting.
The “Dual Circuit” control panel contains connections for
two 5 GPM tool circuits. In addition, the two circuits may
be combined into one 10 GPM tool circuit.

14 ► MHP3 Diesel User Manual
OPERATION
INSTRUMENTS
BATTERY CHARGE LIGHT
A problem with the charging circuit exists if the battery
charge light remains on after the engine has started.
OIL PRESSURE LIGHT
A problem with the engine oil lubricating system exists
if the oil pressure light remains on after the engine has
started. Shutdown the engine and then have the lubri-
cating system serviced by a qualied technician.
Dash Panel Warning Lights
NOTICE
If the engine runs out of fuel or dies during operation
or if the stop knob is pulled and the ignition switch
is left in the ON position, the battery may become
discharged. Make sure the start switch is returned to
the OFF position.
COLD WEATHER STARTUP
1. Use the procedures described under “Starting The
Engine” and then follow the procedures below.
2. Hydraulic uids are thicker in cold weather, there-
fore, 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 or until the top of the
hydraulic lter feels warm.
3. If the tools and tool hoses are cold, it is recommend-
ed to allow hydraulic uid to circulate through the
tool hoses until warm before using the tools.
1. If using one 5 GPM tool circuit, select either circuit
and connect the PRESSURE FLUID OUT hose to
the male coupler and connect the RETURN FLUID
IN (RETURN) to the female coupler near to it. Con-
nect the other ends of the hoses to the tool.
If using both 5 GPM tool circuits, connect PRES-
SURE FLUID OUT hoses to the male couplers and
connect the RETURN FLUID IN (RETURN) hoses
to the female couplers. Connect the other ends of
the hoses to the tools.
2. Ensure the throttle control is depressed fully to the
idle position.
3. Ensure the tool circuit levers are in the OFF position.
4. If starting the engine in cold weather conditions turn
the start switch until the battery charge light comes
on. Then press and hold the glow plug button for 10-
15 seconds. Release the glow plug button and turn
the start switch to the third start position to crank the
engine.
5. Turn the start switch clockwise to begin cranking the
engine. Use short starting cycles (15 seconds per
minute) to prolong starter life. Extended cranking
can damage the starter motor.
6. After the engine starts, allow it to warm-up.
NOTE:
Hydraulic uids are thicker in cold weather. It is rec-
ommended that the engine be operated at low idle
long enough to allow the uid temperature to warm
to a minimum of 50 °F.
7. When the engine is warmed up the throttle may be
advanced and the hydraulic tool circuits may be
used.

MHP3 Diesel User Manual ◄ 15
OPERATION
VARIOUS TYPES OF WORK
When rst learning to operate the Track Horse,
position the throttle to the “SLOW” position. More
experienced operators may use higher throttle
settings.
FORWARD TRAVEL
• The throttle can be positioned anywhere between
slow and fast for traveling forward depending on the
weight of the load being carried. Heavy loads will
require higher throttle settings and low range in or-
der for the engine to provide enough power to move
the load.
• A switch mounted on the control provides two-speed
(FAST & SLOW) operation.
REVERSE TRAVEL
•
DO NOT attempt to travel in reverse with the throttle
positioned above “SLOW”. This may result in loss of
control and result in injury or death to the operator.
Always position the throttle to a slow position for re-
verse travel to permit increased control and safety.
ENGINE SHUTDOWN
Place both control levers in the OFF position. Push the
throttle control completely in. Allow the engine to idle for
approximately one minute, turn the switch to OFF, and
then pull the stop knob to shutdown the unit. Make sure
the start switch is in the off position.
HYDRAULIC TOOL CIRCUIT CONTROLS
The MHP3 TracHorse provides two circuits, each with
an oil ow of 5 gpm/19 lpm up to 2000 psi/140 bar. Or
the two circuits may be combined into one circuit provid-
ing 10 gpm/38 lpm up to 2000 psi/140 bar.
The MHP3 TracHorse contains a hydraulic pump with
two sections. Each pump section will provide 5 gpm/19
lpm at the maximum, governed engine throttle. The out-
put (5 gpm/19 lpm) of each pump section is directed to
the panel control valve assembly. It is the position of
the hydraulic circuit combiner knob on the panel control
valve assembly which keeps the output of each pump
section separated or combined.
When the hydraulic circuit combiner knob is pulled out,
the two circuits are combined into one 10 gpm/38 lpm
circuit. One hydraulic tool may be connected to one cir-
cuit. The other circuit must not have a tool connected to
it or have the hoses connected. The circuit is activated
by pushing both control levers up.
When the hydraulic circuit combiner knob is pushed in,
the two circuits are not combined and each circuit pro-
vides 5 gpm/19 lpm. One hydraulic tool may be connect-
ed to each circuit. Each circuit is activated by pushing
the circuit lever up.
Oil ow is regulated by pulling the throttle control to the
full throttle position. This setting will produce 10 gpm/38
lpm up to 2000 psi/140 bar.
Male Quick Disconnect Couplers
Female Quick Disconnect Couplers
Combiner Knob
Control Lever
(shown in OFF
position)
Hour Meter
ADJUSTING THROTTLE FOR

16 ► MHP3 Diesel User Manual
OPERATION
the right track control. Resume pushing forward on
the left track control to move forward in a straight
line.
• TO TURN RIGHT WHILE MOVING FORWARD:
Release the right track control while pushing for-
ward on the left track control. Resume pushing for-
ward on the right track control to move forward in a
straight line.
• Always switch the two-speed control to “LOW”
speed operation when moving in reverse.
SLOPE OPERATION
• DO NOT operate the machine on slopes exceed-
ing 60 percent (30°) in the travel direction or across
slopes exceeding 45 percent (24°).
• Depending on the load carried in the bed, it may be
preferable to back up steep slopes.
• If traversing over large obstructions such as railroad
rail or curbs, travel at an angle (45 degrees) to the
obstruction. In some cases it may be easier to back
over them.
• Avoid turning on slopes. If you must turn, turn slowly
downhill, if possible.
• DO NOT operate the machine near drop-offs, ditch-
es, or embankments. The machine could suddenly
turn over if a track goes over the edge or if an edge
collapses.
• DO NOT try to stabilize the machine if it is tipping
over. Let go of the machine and get out of its way.
TRAVELING FORWARD OR REVERSE
Track Steering Controls
To travel forward, reverse, turn left, or turn right, do the
following:
FORWARD TRAVEL
• TO MOVE FORWARD IN A STRAIGHT LINE: Move
both the left and right track controls forward at the
same time.
• TO TURN LEFT WHILE MOVING FORWARD: Re-
lease the left track control while pushing forward on TO TURN LEFT WHILE
MOVING FORWARD
Release left control while
holding right control
forward
TO TRAVEL FORWARD
Move Both Controls
Forward

MHP3 Diesel User Manual ◄ 17
OPERATION
•
TO TURN LEFT WHILE
MOVING BACKWARD
Release left control while
holding right control
backward
TO TURN RIGHT WHILE MOVING BACKWARD:
Release the right track control while pulling back-
ward on the left track control. Resume pulling back-
ward on the right track control to move backward in
a straight line.
TURNING FROM A STOP
• TO TURN LEFT FROM A STOP: Moving the right
track control forward and moving the left track con-
trol backward at the same time will increase the
turning rate.
TO TURN RIGHT WHILE
MOVING FORWARD
Release right control
while holding left control
forward
REVERSE TRAVEL
•
DO NOT attempt to travel in reverse with the throttle
positioned above “SLOW”. This may result in loss of
control and result in injury or death to the operator.
TO MOVE BACKWARDS IN A STRAIGHT LINE:
Move both the left and right track controls backward
at the same time.
• TO TURN LEFT WHILE MOVING BACKWARD:
Release the left track control while pulling backward
on the right track control. Resume pulling back-
ward on the left track control to move backward in a
straight line. TO TURN RIGHT WHILE
MOVING BACKWARD
Release right control
while holding left control
backward
TO TRAVEL
BACKWARD
Move Both Controls
Backward

18 ► MHP3 Diesel User Manual
OPERATION
•
TO TURN LEFT
FROM A STOP
Move the right control
forward and the left
control backward
TO TURN RIGHT FROM A STOP: Moving the left
track control forward and moving the right track
control backward at the same time will increase the
turning rate.
TO TURN RIGHT
FROM A STOP
Move the left control
forward and the right
control backward
LOADING AND UNLOADING
1. Use loading ramps or a loading dock to load and un-
load the machine. Ensure loading ramps are strong
enough to support the load. When using ramps, do
not exceed a 15 degree incline (27 percent).
2. Ensure the wheels of the trailer and the tow vehicle
have been chocked front and rear.
3. Use the “SLOW” throttle setting when loading or
unloading. Always switch the two-speed control to
“LOW” speed operation when moving in reverse.
4. Drive the machine onto the trailer backwards (en-
gine rst). This will help prevent instability and keeps
the operator “up hill” from the machine during load-
ing and unloading.
5. After loading, place chocks at the front and rear of
the tracks.
LIFTING
The unloaded TracHorse can be lifted using the single
central lift point. Some safety rules may require 3-point
lifting. (Center lift point plus 2-points on forward side of
rails.)
If lifting with any items in the bed, a 3-point lift is re-
quired. (A 3-point lifting sling is available, refer to Acces-
sories page.)
TRANSPORTING
1. Read the instructions for loading and unloading in
this section.
2. Use chains and binders to secure the load to the
trailer.
ROUTINE MAINTENANCE
Good maintenance practices will keep the machine on
the job and increase its service life.
A very important maintenance practice is to keep the hy-
draulic uid clean at all times. Contaminated hydraulic
Loading and unloading of any type of machine is
dangerous. Never attempt to load or unload the
machine without loading ramps or a loading dock.
Loading ramps must be strong enough, have a low
angle, and correct height. Load and unload the
machine on a level surface. Never attempt to load
or unload the machine if the ramp incline exceeds
15 degrees. Failure to follow these instructions may
result in serious injury or death.

MHP3 Diesel User Manual ◄ 19
MAINTENANCE
must be visible in the sight gauge at all times.
Secure the ller cap before restarting the engine.
– Change the hydraulic lter element every 200
hours of operation. Change more often if cold,
moist or dusty conditions exist.
–Check oil cooler for debris. Remove debris with
air pressure.
2. Removing Condensed Moisture From Hydraulic
Fluid
Condensation is a frequent problem with cool mo-
bile hydraulic circuits. This condition occurs in moist
or cold climates. When warm air in the hydraulic
tank draws moisture from the cooler air outside, wa-
ter accumulates in the tank.
– Check hydraulic uid level daily. Add uid per
specications in this manual (Refer to Hydraulic
Fluid in this section).
–Remove condensed moisture from the hydrau-
lic 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 wa-
ter 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.
3. Checking Suction Hose
Make sure the suction hose (from the hydraulic tank
to the pump inlet) is not kinked and is clamped se-
curely. This reduces the risk of pump cavitation and
sucking air into the system. All pump ttings should
be tight.
4. Checking Hydraulic Lines and Fittings
Check for loose ttings, leaks, etc., throughout the
hydraulic circuit.
– Check hydraulic lines and ttings for leaks,
kinks, etc. daily. Do not use your hand to per-
form this check.
uid causes rapid wear and/or failure of internal parts.
Follow the maintenance instructions contained in the en-
gine manual.
ENGINE MAINTENANCE
Follow the maintenance schedule and general mainte-
nance instructions in the engine maintenance and op-
eration manual furnished with the unit. Normal mainte-
nance includes:
• Check the air lter daily. Clean if necessary.
• Replace dry air lter every 200 hours of operation.
• Replace fuel lter every 100 hours of operation.
• Change engine oil after rst 50 hours of operation,
then after every 200 hours of operation. Change
more often if cold, moist, or dusty conditions exist.
• Check oil level daily.
• Change oil lter when engine oil is changed.
• Remove dirt and debris from engine with a cloth or
brush daily. Do not use water spray.
HYDRAULIC SYSTEM MAINTENANCE
Observe the following for maximum performance and
service life from the hydraulic system.
• Always keep hydraulic system and uids clean.
• Keep water out of uid. (See 1. below.)
• Keep air out of hydraulic lines. Hydraulic system
overheating and foam at the hydraulic tank breather
indicate air is present in the lines. Keep all suction
line ttings and clamps tight.
• Hydraulic system wear is noted by increased heat
during tool operation, reduced tool performance and
eventual system breakdown.
• Operate with the uid temperature at 50–140 °F/10–
60 °C for improved seal and hose life, and maximum
efciency.
1. Filling The Reservoir
Make sure the engine is stopped before opening the
ller cap. Add uid as needed. Fill slowly with the
recommended uid.
Stop lling when the sight gauge shows full. Fluid

20 ► MHP3 Diesel User Manual
TESTING & TROUBLESHOOTING
GENERAL
Tests and adjustments should be performed periodically
to ensure the TracHorse is operating at maximum ef-
ciency. Stanley Circuit Tester (P/N 04182) is recom-
mended. This tester can be used to isolate problems in
both the engine and hydraulic system prior to any Tra-
cHorse disassembly.
TESTING THE HYDRAULIC CIRCUIT
The following tests can be performed to ensure that the
hydraulic pump is supplying the correct ow and pres-
sure and that the system relief valve is operating prop-
erly.
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 given in this section for
possible causes.
TESTING THE 5 GPM EHTMA TYPE C CIRCUITS
To test either of the two circuits, proceed as follows:
1. Set both Circuit Control Levers to the OFF (down)
position. Push the Combiner Knob IN to separate
the two circuits.
2. Connect the Stanley Circuit Tester across two hose
ends (where the tool would normally be connected)
of one circuit.
3. Fully open the tester restrictor valve (counter clock-
wise).
4. Start the engine and allow it to run until warm.
5. Pull the engine throttle control completely OUT so
that the engine is running at full RPM.
6. Move the Circuit Control Lever for the circuit to be
tested to the ON (up) position.
7. With the engine at high speed, the test ow gauge
should read 4–5 gpm/15–19 lpm.
8. Slowly turn the restrictor valve clockwise while
watching the pressure gauge. The ow rate should
stay at 4–5 gpm/15–19 Ipm as the pressure gauge
reaches 2100–2200 psi/148–155 bar.
9. At 2100–2200 psi/148–155 bar the relief valve
should begin to open. The pressure at which the re-
lief valve just begins to open is commonly referred
to as the “cracking pressure”. At the “cracking pres-
sure”, the ow rate should start to drop because the
relief valve is allowing uid to bypass to the hydrau-
lic reservoir. The “cracking pressure” is preset at the
factory and if it is not within the above range, the
relief valve must be reset as follows:
a. Access to the relief valves can be gained
through the front of the dash behind the two
plugs (item 54, major assy). Use a socket and
ratchet wrench to loosen the locknut on the re-
lief valve.
b. Use an Allen wrench to adjust the relief valve.
Turn clockwise to raise the pressure and coun-
terclockwise to reduce the pressure.
c. Tighten the locknut and test for 2100–2200
psi/148–155 bar as described above.
d. Repeat the above test with the hoses and tester
connected to the other circuit.
TESTING THE 10 GPM EHTMA TYPE D CIRCUIT
The 10 gpm circuit is formed when the combiner knob
is pulled out and both circuit control levers are set to the
ON (up) position. This allows the output of both pump
sections to be combined at one set of ttings to provide
10 gpm/38 Ipm ow to a single tool. To test the circuit,
proceed as follows:
1. Perform Steps 1 through 5 under “Testing The 5
gpm EHTMA Type C Circuits”. Make sure a tool and
hoses ARE NOT CONNECTED to the other tool cir-
cuit.
2. Pull the combiner knob OUT to combine the two cir-
cuits.
3. Raise both control levers to the ON position.
4. With the engine at high speed, the test ow gauge
should read 9–10 gpm/34–38 lpm as the pressure
gauge reaches 2100–2200 psi/148–155 bar.
5. Perform Step 9 under “Testing The 5 gpm EHTMA
Type C Circuits”.
• The track tension is adjusted with the unit lifted off
the ground. Between the drive wheel and front idler
wheel, there are 3 smaller rollers.
• Once the unit is lifted off the ground, adjust the track
tension to achieve 3/8” to ½” sag below the center
small roller.
ADJUSTING TRACK TENSION