PDF Service Manual Bobcat S750 Skid Steer Loader - 6 MB
This is the official service manual for the Bobcat S750 Skid Steer Loader.
It is a comprehensive guide for professional technicians, containing detailed instructions for troubleshooting, repairing, and maintaining the machine.
The manual covers all systems, including hydraulics, hydrostatic drive, engine, and electrical components.
Perform every service task to factory standards and keep your S750 working at peak efficiency.
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--- Page 1 ---
Service Manual
S750 Skid-Steer Loader
S/N A3P211001 & Above
S/N A3P311001 & Above
EQUIPPED WITH
BOBCAT INTERLOCK
CONTROL SYSTEM (BICS™)
6989464 (12-10) Printed in U.S.A. © Bobcat Company 2010
--- Page 3 ---
FW SSL-1008 SM
1-9 S750 Service Manual
--- Page 4 ---
EMERGENCY EXIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-210-1
External Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-210-1
Rear Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-210-1
Front Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-210-1
SEAT BELT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-220-1
Inspection And Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-220-1
10-03 S750 Service Manual
--- Page 5 ---
TRANSPORTING LOADER ON A TRAILER Fastening
Loading And Unloading Figure 10-40-2
Rear Tie Down Front Tie Down
WARNING
AVOID SERIOUS INJURY OR DEATH
Adequately designed ramps of sufficient strength are
needed to support the weight of the machine when
loading onto a transport vehicle. Wood ramps can
break and cause personal injury. P-85615A P-85616A
W-2058-0807
Be sure the transport and towing vehicles are of
adequate size and capacity for weight of loader. (See
Performance on Page SPEC-10-2.)
Figure 10-40-1
P100706A
Alternate Rear Tie Down Alternate Front Tie Down
1
P100705A
P-85466
P-85717A P-85599B
A loader with an empty bucket or no attachment must be
loaded backward onto the transport vehicle [Figure 10-
40-1]. Use the following procedure to fasten the Bobcat loader
to the transport vehicle to prevent the loader from moving
The rear of the trailer must be blocked or supported (Item during sudden stops or when going up or down slopes
1) [Figure 10-40-1] when loading or unloading the loader [Figure 10-40-2].
to prevent the front end of the trailer from raising up.
1. Lower the bucket or attachment to the floor.
2. Stop the engine.
3. Engage the parking brake.
4. Install chains at the front and rear loader tie down
positions [Figure 10-40-2]. (Lift arms shown raised
for clarity.)
5. Fasten each end of the chain to the transport vehicle.
6. Use chain binders to tighten the chains.
10-40-1 S750 Service Manual
--- Page 6 ---
REMOTE START TOOL (SERVICE TOOL) KIT -
7003031
Description
The Remote Start Tool (Service Tool) Kit is a replacement
tool for MEL 1563 Remote Start Tool and MEL 1400B -
BOSS® Diagnostic Tool.
The Remote Start Tool (Service Tool) Kit, P/N 7003031,
can be used to service newer loaders using the supplied
harness P/N 6689747.
A computer can be connected to the Remote Start Tool
(Service Tool) for diagnostics and software updates using
the computer harness P/N 6689746 in conjunction with
the loader harness.
10-61-1 S750 Service Manual
--- Page 7 ---
AIR CLEANER SERVICE Figure 10-80-3
Replacing Filter Elements
Figure 10-80-1
2
3
1 1
P-90647
P-76460G
Pull the outer filter element (Item 1) [Figure 10-80-3] out
It is important to change the air filter element only when and discard.
necessary. The service indicator (Item 1) will FLASH.
Press the information button (Item 3) until the display NOTE: Make sure the filter housing is free of dirt and
screen (Item 2) shows the service codes. Service code debris. Verify that sealing surfaces are clean.
[M0117] (Air Filter Plugged) will show in the display DO NOT use compressed air.
screen (Item 2) [Figure 10-80-1] when air filter change is
necessary. Install new filter element. Push all the way in until it
contacts the base of the housing.
Replace the inner filter every third time the outer filter is
replaced or as indicated. Install the cover and secure the latches [Figure 10-80-2].
Outer Filter NOTE: Ensure the intake hose is connected to the
fitting on the fan housing (Inset) [Figure 10-
Remove the rear grille. (See REAR GRILLE on Page 50- 80-5].
60-1.)
NOTE: Ensure the coolant tank is secured into the
NOTE: The coolant tank can be raised to facilitate coolant tank bracket.
access to the air cleaner.
Install the rear grille.
Figure 10-80-2
2
1
P100229
Open the latches (Item 2) and remove the cover (Item 1)
[Figure 10-80-2].
10-80-1 S750 Service Manual
--- Page 8 ---
ENGINE LUBRICATION SYSTEM Engine Oil Chart
Checking And Adding Engine Oil Figure 10-110-2
ENGINE OIL
Check the engine oil level every day before starting the RECOMMENDED SAE VISCOSITY NUMBER
engine for the work shift. (LUBRICATION OILS FOR DIESEL ENGINE
CRANKCASE)
Figure 10-110-1
1
2
P-90654A
TEMPERATURE RANGE ANTICIPATED BEFORE
Park the machine on level ground. Open the rear door NEXT OIL CHANGE (DIESEL ENGINES MUST USE API
and remove the dipstick (Item 1) [Figure 10-110-1]. CLASSIFICATION CI-4 OR BETTER)
[1] Synthetic Oil - Use recommendation from Synthetic
Keep the oil level between the marks on the dipstick. Do Oil Manufacturer.
not overfill.
Use good quality engine oil that meets API Service
Remove the oil fill cap (Item 2) [Figure 10-110-1] to add Classification of CI-4 or better [Figure 10-110-2].
engine oil.
WARNING
AVOID INJURY OR DEATH
Always clean up spilled fuel or oil. Keep heat, flames,
sparks or lighted tobacco away from fuel and oil.
Failure to use care around combustibles can cause
explosion or fire.
W-2103-0508
10-110-1 S750 Service Manual
--- Page 9 ---
BOB-TACH (HAND LEVER) The spring loaded wedges (Item 1) must contact the
lower edge of the holes in the attachment mounting
Inspection And Maintenance frame (Item 2) [Figure 10-140-2].
Figure 10-140-1 If the wedges do not contact the lower edge of the holes
[Figure 10-140-2], the attachment will be loose and can
come off the Bob-Tach.
Figure 10-140-3
P-85513A
Move the Bob-Tach levers down to engage the wedges
[Figure 10-140-1].
The levers and wedges must move freely.
WARNING
AVOID INJURY OR DEATH
The Bob-Tach wedges must extend through the
holes in the attachment mounting frame. Levers
must be fully down and locked. Failure to secure
wedges can allow attachment to come off.
W-2715-0208
Figure 10-140-2
B-17460
1
Inspect the mounting frame on the attachment and Bob-
Tach, linkages and wedges for excessive wear or
2 damage [Figure 10-140-3]. Replace any parts that are
damaged, bent or missing. Keep all fasteners tight.
Look for cracked welds. Contact your Bobcat dealer for
Wedge must contact lower repair or replacement parts.
edge of hole in the
attachment mounting Lubricate the wedges. (See SERVICE SCHEDULE on
frame. Page 10-70-1.) and (See LUBRICATING THE LOADER
on Page 10-150-1.)
P-31233A P-31233
The wedges (Item 1) [Figure 10-140-2] must extend
through the holes in the attachment mounting frame.
10-140-1 S750 Service Manual
--- Page 10 ---
SPARK ARRESTOR MUFFLER
Cleaning Procedure
WARNING
See the SERVICE SCHEDULE for service interval for
cleaning the spark arrester muffler. (See SERVICE
When the engine is running during service, the
SCHEDULE on Page 10-70-1.)
driving and steering controls must be in neutral and
the parking brake engaged. Failure to do so can
Do not operate the loader with a defective exhaust
cause injury or death.
system. W-2006-1209
Start the engine and run for about 10 seconds while a
IMPORTANT second person, wearing safety glasses, holds a piece of
wood over the outlet of the muffler.
This machine is factory equipped with a U.S.D.A. This will force contaminants out through the cleanout
Forestry Service approved spark arrestor exhaust hole.
system.
Stop the engine.
The spark arrestor muffler, if equipped, must be
cleaned to keep it in working condition. The spark Install and tighten the plug. Close the rear door.
arrestor muffler must be serviced by dumping the
spark chamber every 100 hours of operation.
On some models, the turbocharger functions as the
spark arrestor and must operate correctly for proper
WARNING
spark arrestor function.
AVOID INJURY OR DEATH
If this machine is operated on flammable forest, When an engine is running in an enclosed area, fresh
brush, or grass covered land, it must be equipped air must be added to avoid concentration of exhaust
with a spark arrestor attached to the exhaust system fumes. If the engine is stationary, vent the exhaust
and maintained in working order. Failure to do so will outside. Exhaust fumes contain odorless, invisible
be in violation of California State Law, Section 4442. gases which can kill without warning.
PRC. Refer to local laws and regulations for spark W-2050-0807
arrestor requirements.
I-2284-0409
Stop the engine and open the rear door.
WARNING
Figure 10-170-1
Stop engine and allow the muffler to cool before
cleaning the spark chamber. Wear safety goggles.
Failure to obey can cause serious injury.
W-2011-1285
1
WARNING
Never use machine in atmosphere with explosive
dust or gases or where exhaust can contact
P-90662A
flammable material. Failure to obey warnings can
cause injury or death.
Remove the plug (Item 1) [Figure 10-170-1] from the W-2068-1285
bottom of the muffler.
10-170-1 S750 Service Manual
--- Page 11 ---
SEAT BELT Figure 10-220-1
Inspection And Maintenance 1
WARNING 3
Failure to properly inspect and maintain the seat belt
can cause lack of operator restraint resulting in
serious injury or death.
W-2466-0703
2 4
Check the seat belt daily for correct function.
Inspect the seat belt system thoroughly at least once
each year or more often if the machine is exposed to
severe environmental conditions or applications.
Any seat belt system that shows cuts, fraying, extreme or
unusual wear, significant discolorations due to ultraviolet
UV exposure, dusty / dirty conditions, abrasion to the
seat belt webbing, or damage to the buckle, latch plate,
retractor (if equipped), hardware or any other obvious
problem should be replaced immediately. B-22283
The items below are referenced in [Figure 10-220-1].
1. Check the webbing. If the system is equipped with a
retractor, pull the webbing completely out and inspect
the full length of the webbing. Look for cuts, wear,
fraying, dirt and stiffness.
2. Check the buckle and latch for correct operation.
Make sure latch plate is not excessively worn,
deformed or buckle is not damaged or casing broken.
3. Check the retractor web storage device (if equipped)
by extending webbing to determine if it looks correct
and that it spools out and retracts webbing correctly.
4. Check webbing in areas exposed to ultraviolet (UV)
rays from the sun or extreme dust or dirt. If the original
color of the webbing in these areas is extremely faded
and / or the webbing is packed with dirt, the webbing
strength may have deteriorated.
See your Bobcat dealer for seat belt system replacement
parts for your machine.
10-220-1 S750 Service Manual
--- Page 12 ---
HYDRAULIC/HYDROSTATIC SCHEMATIC
SJC WITH NO OPTIONS
S750 (S/N A3P211001 AND ABOVE)
(PRINTED NOVEMBER 2010)
V-1423legend
LEGEND
1 RESERVOIR: 14 LIFT CYLINDER SPOOL - MADE TO 28 SENSOR – CHARGE PRESSURE –
Capacity at sight gauge . . 9,8 L (2.6 U.S. gal) RESTRICT FLOW DURING BOOM Fan Filter
System Capacity . . . . . . 37,9 L (10.0 U.S. gal) DOWN BUT NOT DURING BOOM UP
29 HYDRAULIC PUMP . . . . . . . Gear Type 87,1 L/min
2 SIGHT GUAGE 15 PILOTED ACTIVATED DIRECTIONAL (23.0 U.S. gpm) at High Engine Idle
CONTROL VALVE - TILT CONTROL
30 CHARGE PUMP -
3 DIFFERENTIAL PRESSURE SWITCH: 51,1 L/min (13.5 U.S. gpm) at High Engine Idle
16 PILOTED ACTIVATED DIRECTIONAL
103 kPa (1,03 bar) (15 psi)
CONTROL VALVE - LIFT CONTROL 31 VARIABLE CAPACITY DISPLACEMENT
Normally Closed
17 BIDIRECTIONAL HYDROSTATIC PUMP
4 FILTER - HYDRAULIC (CANISTER) SOLENOID ACTIVATED DIRECTIONAL
CONTROL VALVE - BICS CONTROL 32 RELIEF/REPLENISHING VALVE - HIGH
5 SPRING LOADED FILTER BY-PASS 18 FILTER - BICS CONTROL VALVE PRESSURE: 36500 kPa (365 bar) (5294 psi)
VALVE: 172 kPa (1,7 bar) (25 psi) (SCREEN) 33 RELIEF VALVE - CHARGE INLET:
19 CHECK VALVE - With 100 kPa 1,0 bar 2654 kPa (26,5 bar) (385 psi) at High
6 DIAGNOSTIC COUPLER
(14.5 psi) Spring Engine Idle With 60 ° C (140 ° F) Fluid
7 RELIEF VALVE - MAIN: 20 RESTRICTION . . . . . . . 2,0 mm (0.079 in) 34 SERVO PISTON – Swash Plate
24132 kPa (241 bar) (3500 psi)
at Front Quick Couplers 21 PULL BUTTON ACTIVATED 35 SOLENOID ACTIVATED DIRECTIONAL
DIRECTIONAL CONTROL VALVE - LIFT CONTROL VALVE – FORWARD/REVERSE
8 RELIEF/ANTICAVITATION VALVE -
ARM BY-PASS 36 FILTER
PORT: 27579 kPa (276 bar) (4000 psi)
22 SENSOR – HYD. TEMPERATURE
9 RELIEF/ANTICAVITATION VALVE - 37 CHECK VALVE – COLD WEATHER BY-PASS
PORT (OPTIONAL): 27579 kPa 23 ANTICAVITATION VALVE With 345 kPa (3,45 bar) (50 psi) Spring
(276 bar) (4000 psi)
38 RESTRICTION – 1,5 mm (0.06 in)
10 SOLENOID ACTIVATED DIRECTIONAL 24 PROPORTIONAL RELIEF VALVE –
(Fan Speed Regulator): 10797-12300 kPa
CONTROL VALVE - AUXILIARY 39 CHECK VALVE - With 1379 kPa (13,8 bar)
(108 - 123 bar) (1566 - 1784 psi)
(200 psi) Spring
11 LOAD CHECK VALVE
25 SPRING LOADED FILTER BY-PASS VALVE: 40 DRIVE MOTOR SHUTTLE VALVE
517 – 572 kPa (5,2 - 5,7 bar) (75 - 83 psi)
12 FRONT AUXILIARY MANUAL PRESSURE
BLEED-OFF VALVE 26 FIXED CAPACITY DISPLACEMENT 41 FIXED CAPACITY DISPLACEMENT
HYDRAULIC MOTOR BIDIRECTIONAL HYDROSTATIC
13 ANTICAVITATION VALVE MOTOR
27 FILTER - HYDRAULIC (CANISTER)
NOTE: Unless otherwise specified
springs have NO significant
pressure value.
Printed in U.S.A. V-1423legend (12-6-10)
--- Page 13 ---
CYLINDER (LIFT) Figure 20-20-2
Testing
Figure 20-20-1
1
2
P-90617
1
Install a cap (Item 1) [Figure 20-20-2] on the hose and
P-90616 tighten.
Engage the parking brake. Lower the seat bar. Start the
Lower the lift arms. Stop the engine. Raise the seat bar. engine and press the PTOL button.
Operate the controls that lower the lift arms.
WARNING If there is any leakage from the fitting on the cylinder
(Item 2) [Figure 20-20-2], remove the lift cylinder for
repair. Repeat the procedure to check the other lift
Hydraulic fluid escaping under pressure can have cylinder.
sufficient force to enter a person’s body by
penetrating the skin. This can cause serious injury
and possible death if proper medical treatment by a
physician familiar with this injury is not received
immediately.
W-2145-0290
Check only one cylinder at a time. Disconnect the hose
(Item 1) [Figure 20-20-1] which goes to the base end of
the lift cylinder.
20-20-1 S750 Service Manual
--- Page 14 ---
CYLINDER (TILT) Figure 20-21-2
Testing
Figure 20-21-1
1
2
1
P-85552
Install a cap (Item 1) [Figure 20-21-2] in the hydraulic
P-85553 hose and tighten.
Engage the parking brake. Lower the seat bar. Start the
Remove the attachment. Roll the Bob-Tach fully back. engine and press the PTOL button.
Stop the engine. Raise the seat bar.
Operate the controls that rolls the Bob-Tach forward.
If there is any leakage from the fitting on the cylinder
WARNING (Item 2) [Figure 20-21-2]. Remove the lift cylinder for
repair.
Hydraulic fluid escaping under pressure can have Repeat procedure to check the other tilt cylinder.
sufficient force to enter a person’s body by
penetrating the skin. This can cause serious injury
and possible death if proper medical treatment by a
physician familiar with this injury is not received
immediately.
W-2145-0290
Disconnect the hose (Item 1) [Figure 20-21-1] which
goes to the base end of the tilt cylinder.
20-21-1 S750 Service Manual
--- Page 15 ---
CYLINDER (BOB-TACH) Figure 20-22-2
Testing
WARNING 1
AVOID INJURY OR DEATH
Diesel fuel or hydraulic fluid under pressure can
penetrate skin or eyes, causing serious injury or
death. Fluid leaks under pressure may not be visible.
Use a piece of cardboard or wood to find leaks. Do
not use your bare hand. Wear safety goggles. If fluid
enters skin or eyes, get immediate medical attention P-85570
from a physician familiar with this injury.
W-2072-0807
Disconnect the hose (Item 1) [Figure 20-22-2] from the
power Bob-Tach cylinder base end port.
WARNING Figure 20-22-3
AVOID INJURY OR DEATH
Always clean up spilled fuel or oil. Keep heat, flames,
1
sparks or lighted tobacco away from fuel and oil.
Failure to use care around combustibles can cause
explosion or fire.
W-2103-0508
Figure 20-22-1
P-85568
Install a plug in the hose (Item 1) [Figure 20-22-3] and
tighten.
Engage the parking brake. Lower the seat bar. Start the
engine.
Push and hold the BOB-TACH “WEDGES UP” Switch
(Front Accessory Panel).
P-85570
If there is any leakage from the base end cylinder port
Tilt the Bob-Tach forward, so it is parallel to the floor (Item 2) [Figure 20-22-3], remove the cylinder for repair.
[Figure 20-22-1].
Push and hold BOB-TACH “WEDGES UP” switch until
levers are in the unlocked position (Wedges fully raised).
20-22-1 S750 Service Manual
--- Page 16 ---
MAIN RELIEF VALVE (CONT’D) Watch the flow meter on the hydraulic tester to make
sure the flow is correct. Increase the engine speed to full
Testing (Cont’d) rpm.
Figure 20-30-3 Refer to (See Hydraulic System on Page SPEC-10-4.) for
both flow and pressure specifications of the hydraulic
Right system.
Steering
Lever
Check the free flow specification.
Control
With the engine at high idle and hydraulic oil at 60°C
(140°F) turn the restrictor control on the tester until the
flow through the tester drops to zero. Check the relief
pressure.
1 If the relief pressure is not correct, stop the engine and
adjust the main relief valve.
P-85572
Figure 20-30-4
Joystick Option Only
Right
Steering
1 Lever
Control
P-26697
• Push the front switch (Item 1) [Figure 20-30-3] and
[Figure 20-30-4] to give the front quick couplers a
constant flow of fluid.
• To release from continuous operation, press the front
switch (Item 1) [Figure 20-30-3] and [Figure 20-30-
4] a second time.
20-30-3 S750 Service Manual
--- Page 17 ---
HYDRAULIC CONTROL VALVE (STANDARD) Figure 20-40-3
(CONT'D)
Lift Load Check Valve Removal And Installation
1
Figure 20-40-1
2
3
1 P-90309