PDF Service Manual Bobcat CT440 CT445 & CT450 Compact Tractor - 4 MB
This single, comprehensive service manual is your go-to resource for the Bobcat CT440, CT445, and CT450 compact tractors.
It provides detailed instructions for all maintenance and repair procedures, from routine fluid changes to complex transmission work.
With clear illustrations and specifications, this manual helps you get the job done right.
It is an essential tool for keeping your Bobcat tractor operating reliably for years to come.
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--- Page 1 ---
Service Manual
CT440, CT445, CT450
Compact Tractor
HST - S/N ABHE11001 & Above
HST - S/N ABHL11001 & Above
HST - S/N ABHM11001 & Above
SST - S/N AKB911001 & Above
SST - S/N AKBP11001 & Above
6987079enUS (1-14) (E) Printed in U.S.A. © Bobcat Company 2014
--- Page 3 ---
SAFETY INSTRUCTIONS (CONT’D) • Make certain that the Slow Moving Vehicle (SMV)
emblem is installed so that it is visible and legible.
Safety Rules For Power Take-Off (PTO) Driven When transporting the equipment, use the compact
Implements tractor flashing warning lights and follow all local
regulations.
• Keep PTO shields and all guards in place. Replace
damaged or missing shields and guards before • Operate this equipment with a compact tractor
operating. equipped with an approved Roll-Over Protective
Structure (ROPS). Always wear seat belt when the
• Follow warnings and instructions on machine signs ROPS is up. Serious injury or death could result from
(decals). Replace damaged or missing decals. falling off the compact tractor.
• Do not wear loose or bulky clothing around the PTO • Before leaving the compact tractor operator’s seat:
or other moving parts.
1. Park on flat level ground.
• Keep bystanders away from PTO driven equipment, 2. Fully lower the loader arms and put the
and never allow children near machines. attachment flat on the ground (if equipped).
3. Fully lower the three-point hitch or mid-mount
• Read and understand the manuals for the PTO driven implements (if equipped).
equipment and be aware of safe operating 4. Lock brake pedals together and engage the
procedures and hazards that may not be readily parking brake.
apparent. 5. Place all controls in neutral.
6. Stop engine, unfasten seat belt and remove the
• Always walk around equipment to avoid coming near
key.
a turning PTO driveline. Stepping over, leaning
across or crawling under a turning PTO driveline can
cause entanglement.
• Never allow riders on the compact tractor or
implement. Falling off can result in serious injury or
• Position the machine and implement hitch correctly to
death.
prevent driveline stress and separation.
• Start the compact tractor only when properly seated in
• Use caution when turning. Turning too sharp can
the operator’s seat. Starting a compact tractor in gear
cause driveline damage.
can result in serious injury or death.
• Use caution when raising PTO driven implement.
• Operate the compact tractor and attachments /
Excessive driveline angle can cause driveline
implements from the operator's position only.
damage. Use stops if needed.
• Add the correct front ballast for rear three-point hitch
Compact Tractor Requirements and Capabilities
implements and pull type implements. Add the correct
rear ballast when using the loader and attachments.
• Fasten seat belt securely when Roll-Over Protective
Front and rear ballast can be purchased from your
Structure (ROPS) is up and locked. DO NOT wear
compact tractor dealer.
seat belt if ROPS is down.
• Do not handle large objects (such as round bales or
• Compact tractor must be equipped with sway bars or
posts) unless the loader is equipped with the proper
chains.
attachment and the load is secured.
• Stop the compact tractor and engage the parking
• The parking brake must be engaged before leaving
brakes. Install blocks in front of and behind the rear
the compact tractor operator’s seat. Rollaway can
tires of the compact tractor. Install blocks underneath
occur because the transmission may not prevent
and support the implement securely before working
machine movement. Lock the brake pedals together
under raised implements.
before activating the parking brake.
• Keep bystanders clear of moving parts and the work
area. Keep children away.
• Use increased caution on slopes and near banks and
ditches to prevent overturn.
SI CT-0913 SM
1-11 CT440, CT445, CT450 Service Manual
--- Page 4 ---
SAFETY INTERLOCK SYSTEM - OPERATING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-210-1
Inspection And Maintenance (HST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-210-1
Inspection And Maintenance (SST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-210-2
PARKING BRAKE SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-220-1
Inspection And Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-220-1
BRAKE SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-230-1
Inspection And Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-230-1
Adjusting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-230-3
TRAVEL CONTROL PEDAL (HST ONLY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-240-1
Inspection And Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-240-1
F-N-R LEVER (SST ONLY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-241-1
Inspection And Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-241-1
CRUISE CONTROL (HST ONLY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-250-1
Inspection And Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-250-1
CLUTCH PEDAL (SST ONLY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-251-1
Inspection And Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-251-1
SPEED RANGE LEVER (HST ONLY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-260-1
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-260-1
BOB-TACH (HAND LEVER) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-270-1
Inspection And Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-270-1
CLUTCH PEDAL AND HOUSING (SST ONLY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-280-1
Draining Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-280-1
Storage Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-280-1
DIFFERENTIAL LOCK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-290-1
Inspection And Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-290-1
Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-290-1
10-03 CT440, CT445, CT450 Service Manual
--- Page 5 ---
TOWING THE COMPACT TRACTOR Towing Compact Tractor With Loader Installed;
Procedure If possible, slightly raise the attachment off of the ground.
The compact tractor will need to be towed backwards (if
possible), to avoid the bucket (or attachment) from
digging into the ground while towing.
IMPORTANT Use the towing procedure described but install the tow
chain to the rear of the compact tractor and tow
Never tow the compact tractor faster than 16 km/h backwards.
(10 mph). Always have someone seated to steer and
brake the towed compact tractor. Towing Compact Tractor With Implement Installed;
Tow the compact tractor for short distances only. If the engine can be started, slightly raise the implement
I-2263-0910
off of the ground. The type of implement will determine
which direction to tow the compact tractor.
NOTE: When the engine is not running, turning the
steering wheel will require more effort. Power Implements that dig into the ground will be difficult to tow
steering assist is not available when the and may require the implement to be disconnected from
engine is OFF. the compact tractor before towing. (Example; plow or
cultivator.) If the implement must be removed before
Install a tow chain (or cable) to the front (for towing in the towing, use the procedure described previously and tow
forward direction) or to the drawbar (for towing in the forward to get the compact tractor away from the
rearward direction). implement.
The tow chain (or cable) must be rated at 1.5 times the NOTE: Do not connect the tow chain (or cable) to the
weight of the compact tractor and implement / loader, attachment or the implement. Connect
attachment. (See CT440 SPECIFICATIONS (HST) on to the compact tractor only as shown. The
Page SPEC-10-1.) OR (See CT445 SPECIFICATIONS rated strength of the tow chain or cable must
(HST) on Page SPEC-11-1.) OR (See CT445 be rated at 1.5 times the weight of the engine
SPECIFICATIONS (sST) on Page SPEC-12-1.) towed load (compact tractor plus the
attachment or implement installed). Add the
Enter the compact tractor and fasten the seat belt. Move weight of the compact tractor, the loader, the
both the rear and the mid-PTO levers to the disengaged attachment and / or the implement together
(OFF) position. for the total machine weight to calculate the
strength of the tow chain or cable needed.
Disengage the front wheel assist.
Move the speed range lever to neutral. Place all controls
in neutral.
For SST Model Only: Move the F-N-R lever to neutral (N)
and the gear shift lever to neutral.
Disengage the parking brake (but leave the brake pedals
locked together for slowing or stopping the compact
tractor).
Always have an operator seated in the operator’s seat to
operate the steering and brakes while towing the
compact tractor. Use ROPS and fasten seat belt. Engage
the parking brake and stop the engine before leaving the
machine.
If the compact tractor is equipped with a loader or has an
implement attached and the engine can not be started,
tow the compact tractor using one of the following
procedures.
10-50-1 CT440, CT445, CT450 Service Manual
--- Page 6 ---
ENGINE COOLING SYSTEM Figure 10-90-2
Checking Level
Open the engine cover. (See Opening And Closing on
Page 10-20-1.)
Figure 10-90-1
1
P-84843
The coolant level in the recovery tank must be between
1 the marks on the tank (Item 1) [Figure 10-90-2] when the
engine is cool.
P-84838 NOTE: The cooling system is factory filled with
ethylene glycol coolant (green color). DO NOT
mix ethylene glycol with propylene glycol.
The coolant recovery tank (Item 1) [Figure 10-90-1] is
located on the right side of the engine. Ethylene Glycol
Add premixed coolant; 50% water 50% ethylene glycol to
WARNING the recovery tank if the coolant level is low.
One gallon (3,8 L) ethylene glycol mixed with one gallon
AVOID INJURY (3,8 L) of water is the correct mixture of coolant to
Stop the engine and allow to cool before adding provide a -37°C (-34°F) freeze protection.
coolant or you can be burned.
W-2106-0907 Use a refractometer to check the condition of ethylene
glycol in your cooling system.
IMPORTANT WARNING
AVOID ENGINE DAMAGE AVOID INJURY OR DEATH
Always use the correct ratio of water to antifreeze. Wear safety glasses to prevent eye injury when any
of the following conditions exist:
Too much antifreeze reduces cooling system • When fluids are under pressure.
efficiency and may cause serious premature engine • Flying debris or loose material is present.
damage. • Engine is running.
• Tools are being used.
W-2019-0907
Too little antifreeze reduces the additives which
protect the internal engine components; reduces the
boiling point and freeze protection of the system.
Always add a premixed solution. Adding full strength
concentrated coolant can cause serious premature
engine damage.
I-2124-0497
10-90-1 CT440, CT445, CT450 Service Manual
--- Page 7 ---
HYDRAULIC / HYDROSTATIC / TRANSMISSION Transmission / Differential Fluid Chart
SYSTEM
Checking And Adding Fluid
Use only recommended fluid in the hydraulic / hydrostatic
/ transmission system. (See Chart on Page SPEC-50-1.)
Park the compact tractor on a flat level surface, lower the
loader arms (if equipped) and lower implement (if
equipped).
NOTE: Failure to use the proper transmission /
differential fluid may result in diminished
brake performance.
Lock brake pedals together and engage the parking P-64023D
brake.
Place all controls in the neutral position. Figure 10-120-2
Stop the engine.
Figure 10-120-1
2
1
1 P-84808
If needed, remove the fill cap (Item 1) [Figure 10-120-2]
P-84805 and add fluid. (See chart above.)
NOTE: When installing the fill cap (Item 1), position it
Check the fluid level at the dipstick (Item 1) [Figure 10- as shown. The fill cap has a breather hole
120-1]. (Item 2) [Figure 10-120-2] that needs to be in
the up position.
Keep the oil level between the marks on the dipstick.
10-120-1 CT440, CT445, CT450 Service Manual
--- Page 8 ---
AIR CONDITIONING BELT Figure 10-161-3
Belt Adjustment
Stop the engine and engage the parking brake.
Open the engine cover. (See Opening And Closing on
Page 10-20-1.)
Remove the left side engine panel. (See Removal And
Installation on Page 50-100-1.)
Figure 10-161-1 1
P-89325
2
The tension is correct with 8 mm (5/16 in) belt movement
at mid span (Item 1) [Figure 10-161-3] when 67 N (15 lb)
force is applied to the belt.
After adjustment is made, tighten the jam nut (Item 1) and
1 the nut (Item 2) [Figure 10-161-1] on the pulley.
Belt Replacement
P-87868 Loosen the jam nut (Item 1) on the belt tensioner and the
nut (Item 2) [Figure 10-161-1] on the pulley.
Loosen the jam nut (Item 1) on the belt tensioner and the Loosen the adjusting nut (Item 1) [Figure 10-161-2]
nut (Item 2) [Figure 10-161-1] on the pulley. completely.
Figure 10-161-2 Remove the belt.
1
P-87870
Turn the inner nut (Item 1) [Figure 10-161-2] clockwise to
tighten the belt or counterclockwise to loosen the belt.
10-161-1 CT440, CT445, CT450 Service Manual
--- Page 9 ---
SAFETY INTERLOCK SYSTEM - OPERATING 3. Sit in the operator’s seat and fasten the seat belt -
Engage the parking brake - Place all controls in
Inspection And Maintenance (HST) neutral - Move engine speed control lever to low
engine speed - Start the engine - Move the speed
range lever to LOW (L) speed range - Unfasten the
seat belt and raise off the operator’s seat; THE
WARNING ENGINE MUST STOP. Repeat this step for MEDIUM
(M) and HIGH (H) speed ranges.
AVOID INJURY OR DEATH
If the engine does not shut off after performing any of the
The Safety Interlock System must shut off the engine
above procedures, FURTHER TROUBLESHOOTING
if the operator leaves the operator’s seat unless: the
MUST BE DONE.
parking brake is engaged, the mid-PTO lever is
disengaged, and the speed range lever is in neutral.
Figure 10-210-1
Contact your dealer for service if the Safety Interlock
System does not function properly. DO NOT MODIFY
THE SYSTEM.
W-2749-0708
The Safety Interlock System - Operating:
The engine must shut off if the operator leaves the
operator’s seat, unless all the following conditions are
present: 1
1. The parking brake is engaged.
2. The mid-PTO lever (if equipped) is in the disengaged
(OFF) position. P-78025
3. The speed range lever is in the neutral position.
The seat switch (Item 1) [Figure 10-210-1] is installed in
If the engine does not shut off when the operator leaves the bottom of the seat. Replace the seat switch and
the operator’s seat without all of the above conditions components if damaged or missing. See your Bobcat
present, the compact tractor must be serviced by your dealer for parts.
Bobcat dealer.
Inspecting Procedure:
Perform this procedure on flat level ground and make WARNING
sure the area is clear of bystanders.
AVOID INJURY OR DEATH
1. Sit in the operator’s seat and fasten the seat belt - • Check that seat switch is properly installed and
Engage the parking brake - Place all controls in functions correctly.
neutral - Move engine speed control lever to low • Replace switch and components if damaged or
engine speed - Start the engine - Release the Parking missing.
Brake - Unfasten the seat belt and raise off the W-2676-0907
operator’s seat; THE ENGINE MUST STOP.
2. Sit in the operator’s seat and fasten the seat belt -
Engage the parking brake - Place all controls in
neutral - Move engine speed control lever to low
engine speed - Start the engine - Move the mid-PTO
lever to the ON position (if equipped) - Unfasten the
seat belt and raise off the operator’s seat; THE
ENGINE MUST STOP.
10-210-1 CT440, CT445, CT450 Service Manual
--- Page 10 ---
CRUISE CONTROL (HST ONLY) Figure 10-250-3
Inspection And Maintenance 3
Figure 10-250-1 2
1
1
P-84852
The cruise control is controlled by a magnet (Item 1) that
P-84914
holds the forward travel pedal (Item 2) [Figure 10-250-3]
in the selected forward travel speed position.
If the cruise control switch (Item 1) [Figure 10-250-1]
If adjustment is needed, loosen the bolts (Item 3) [Figure
does not maintain the selected speed, the cruise control
10-250-3] and position the magnet so there is 1,0 - 1,5
will need to be adjusted.
mm (0.039- 0.059 in) clearance between the side of the
forward travel pedal and the face of the magnet. Tighten
Figure 10-250-2
the bolts after adjustment is made.
Figure 10-250-4
2
3
1
P-84851 1
P-84850
NOTE: The brake pedals (Item 1) must be in the locked
position with the lock lever (Item 2) and the
unlocked brake pedal switch (Item 3) [Figure
The controller (Item 1) [Figure 10-250-4] located below
10-250-2] engaged to activate the cruise
the operator’s seat, also controls the cruise control
control. If the brake pedals are not locked
magnet. If the cruise control will still not maintain the
together, the switch will not allow power to
selected speed, the controller may be defective.
the cruise control switch. Make sure the
switch is activated before proceeding with
The cruise control must disengage when both brake
any additional adjustment procedures.
pedals are pressed or the cruise control switch is moved
to the OFF position. If the system does not function
properly, further troubleshooting and testing must be
done.
10-250-1 CT440, CT445, CT450 Service Manual
--- Page 11 ---
HYDRAULIC SYSTEM
HYDRAULIC SYSTEM INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-10-1
Glossary Of Hydraulic / Hydrostatic Symbols For Compact Tractors . . . . . . . . . . . . 20-10-1
Troubleshooting The Hydraulic Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-10-5
Troubleshooting The Joystick Valve Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-10-5
Troubleshooting The Power Lift Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-10-6
Troubleshooting The Steering Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-10-7
MAIN RELIEF VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-20-1
Testing Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-20-1
Testing And Adjusting The Main Relief Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-20-1
HYDRAULIC PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-30-1
Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-30-1
Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-30-3
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-30-4
Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-30-8
STEERING VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-1
Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-1
Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-2
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-3
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-8
Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-40-8
STEERING VALVE TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-41-1
Relief Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-41-1
Working Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-41-2
STEERING CYLINDER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-50-1
Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-50-1
Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-50-3
Disassembly And Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-50-4
STEERING CYLINDER (SST MODELS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-51-1
Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-51-1
Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-51-4
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-51-5
Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-51-7
RIGHT JOYSTICK (WITHOUT CAB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-60-1
Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-60-1
Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-60-3
Disassembly And Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-60-4
Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-60-6
20-01 CT440, CT445, CT450 Service Manual
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HYDRAULIC SYSTEM INFORMATION (CONT’D)
Troubleshooting The Hydraulic Circuit
PROBLEM CAUSE CORRECTION
No hydraulic operation at one or Hydraulic oil level low Refill with correct oil
more circuits Hydraulic pump drive coupling damaged Replace