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6.10. Possible failures of FDA and instructions for their troubleshooting
The list of possible failures of front driving axle and instructions for their trouble-
shooting are shown in Table 6.10.1.
Table 6.10.1
Failure,
external manifestation, cause
Troubleshooting
Increased wear and delaminating of front tires
Faulty toe-in of front wheels
Adjust toe-in of front wheels as indicated in section
5 “Maintenance”.
Noncompliance of pressure in tires
to the recommended standards
Adjust pressure in tires as indicated in subsection
3.2.8 “Selection of optimal inflation pressure in
tires depending on operating conditions and tractor
axle load”
Front axle is constantly forcedly
engaged
Do not use the mode “FDA on” all the time. If FDA
is constantly engaged for the reason of FDA con-
trol failure, eliminate it
Drive clutch fails to transmit torque
No pressure in the clutch booster
Disassemble the distribution valve, rinse the case
and spool
Failure of system electrics
Detect and eliminate the failure in ECS of FDA
Insufficient value of torque transferred
Low pressure in the transmission
hydraulic system
Adjust pressure in the transmission hydraulic sys-
tem to the value from 1.1 to 1.2 MPa
Increased leakage in drive control
hydraulic system:
- wear of piston and drum O-rings;
- wear of mating surfaces sleeve –
drum hub, drum – piston;
- wear of disk packs
Replace O-rings
Replace worn-out parts
Replace worn-out parts
Drive fails to operate in automated mode
Disconnect switch of FDA drive
automatic engagement sensor got
out of adjustment
Adjust the disconnect switch of FDA drive auto-
matic engagement sensor
Increased noise generated by main gear
Increased clearance in the driving
gear bearing of reduction unit
Check and adjust gear bearings, if necessary
Side clearance in the main pair of
central reduction unit got out of ad-
justment
Adjust the side clearance in the main pair of central
reduction unit
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