82.3-0000010 OM
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6.11 Possible failures in transmission hydraulic system and instructions for
troubleshooting
Possible failures in the transmission hydraulic system and guidelines for trouble-
shooting are given in Table 6.11.1.
Table 6.11.1
Failure,
external manifestation, cause
Troubleshooting
Low oil pressure in transmission hydraulic system
Insufficient oil level in transmission
Check the oil level in transmission as specified in
Section 5 “
Maintenance.” If necessary, refill the
oil up to the required level
Clogging of operation pressure adjust-
ing valve of transmission HS
Rinse the operation pressure adjusting valve of
transmission HS
Clogging of filter of transmission hy-
draulic system (annunciato
dirtiness lights up on the control
panel for rear axle DL, FDA drive
and rear PTO)
Unscrew the cup and change the replaceable fil-
ter cartridge of transmission hydraulic system
Shrinkage of the spring of the opera-
tion pressure adjusting
Adjust the pressure with adjustment washers. If it
is impossible, then replace the spring
No oil pressure in transmission hydraulic system
Breakdown of gear pump of transmis-
sion hydraulic system
Replace the transmission HS pump
Parts of pump drive of transmission
hydraulic system are damaged
Replace the damaged parts of transmission HS
pump drive
High oil pressure in transmission hydraulic system
The refilled oil does not match the
season (air temperature)
Use the appropriate seasonal oil
Sticking of operation pressure adjust-
ing valve of transmission HS
Rinse the operation pressure adjusting valve of
transmission HS
Insufficient oil level in transmission
Check the oil level in the transmission as speci-
fied in Section 5 “Maintenance.” In necessary re-
fill the oil up to the required level
Wear or damage of bearings of other
transmission parts
Note – The hydraulic circuit diagram of transmission hydraulics is presented in An-
nex C.
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