2122.6-0000010 OM
219
6.9 Possible failures of the transmission hydraulic system and instructions
for their troubleshooting
The list of possible failures in the transmission hydraulic system and instructions for
their troubleshooting are shown in Table 6.9.1.
Table 6.9.1
Failure,
external manifestation, cause
Troubleshooting
Low oil pressure in the transmission hydraulic system
Insufficient oil level in the trans-
mission
Check oil level in the transmission as indicated in
section 5 “Maintenance service”. Refill oil up to the
required level, if necessary.
Failure of transmission hydraulics
pump
Replace or repair the transmission hydraulics
pump
Clogging of the full-flow mesh filter
Rinse the full-flow mesh filter
Clogging of the duplex filter (a pilot
lamp will light up on the control
board for the rear axle DL and the
FDA drive)
Replace both filter elements of the duplex filter as
specified in section 5 “Maintenance”
Oil leakage in boosters of friction
clutches
Eliminate the failures in a specialized workshop
Spring 2 (figure 5.4.31) of the op-
erating pressure adjusting valve for
the transmission hydraulics 3 lost
its properties
Replace the spring or adjust with adjusting wash-
ers 4 (figure 5.4.31) by increasing their number
No oil pressure in the transmission hydraulic system
Breakdown of the gear wheel
pump in the transmission hydraulic
system
Replace the gear wheel pump in the transmission
hydraulic system
Transmission hydraulic system
pump drive is off
Engage the transmission hydraulic system pump
drive
Damaged parts of the transmission
hydraulic system pump drive
Replace damaged parts of the transmission hy-
draulic system pump drive
High oil pressure in the transmission hydraulic system
Filled oil does not correspond to
the season (ambient temperature)
Fill in corresponding seasonal oil
Incorrect setting of the operating
pressure adjusting valve for the
transmission hydraulics 3 (figure
5.4.31) of the duplex filter
Decrease the number of adjusting washers 4 (fig-
ure 5.4.31)
Increased noise
Insufficient oil level in transmission Check oil level in the transmission as indicated in
section 5 “Maintenance”. Refill oil up to the re-
quired level, if necessary.
Wear or breakage of bearings of
other transmission components
Replace bearings or other worn out parts of the
transmission
Noisy switching of range tooth clutches
Unfinished coupling clutch disen-
gagement (clutch “grabs and
shudders”)
Carry out checks and adjustment of the coupling
clutch as specified in table 6.1.1
https://tractormanualz.com/