82.3-0000010 OM
229
6.10 Possible failures of hydraulic lift linkage and instructions for troubleshooting
6.10.1 Possible failures of HLL with draft control unit and instructions for
troubleshooting
The list of possible failures in the HLL with draft control unit and guidelines for trouble-
shooting are given in Table 6.10.1
Table 6.10.1
Failure,
external manifestation
Troubleshooting
RLL fails to rise with agricultural implement attached
There is no pressure in the hy-
draulic system:
- sticking of the bypass valve of
the distributor;
- clogging of the safety valve of
the distributor;
- clogging of the grid of the safe-
ty valve of the distributor;
- insufficient amount of oil in the
Remove valve parts, wash and install in the body.
The valve must move freely
Disassemble the safety valve, flush, reinstall. Ad-
just valve operating pressure
Clean the safety valve grid
Add oil to the tank to the recommended level
Check pump performance, replace if necessary
Length of the draft control unit
rod misadjusted
Weight of the implement ex-
ceeds the al
lowable weight for
the tractor RLL
Use agricultural implements agreed with the man-
ufacturing company
No forced lowering of RLL
Draft control unit rods adjusted
incorrectly
Slow rise of RLL with agricultural implement attached
Air leakage into the hydraulic
system
Locate the leak and fix the defect
Check pump performance, replace if necessary
Weight of the agricultural imple-
ment exceeds the allowable
weight for the tractor lift linkage
Use agricultural implements agreed with the man-
ufacturing company
Foaming of oil in the tank and splashing through the breather
Air leakage into the system
through the suction line
Tighten the fastening and, if necessary, replace
the gaskets of the suction pipe
Air leakage through the self-
tightening seals of the HLL oil
pump
Check the condition of the self-tightening seals
and replace if necessary.
Oil level in the tank is too high
Drain excess oil to reach the recommended level
Increased oil heating during system operation
Insufficient amount of oil in the
tank
Add oil to the tank to reach the recommended lev-
el
Oil lines bent or crushed
Repair dents or replace the oil line
Sticking of the hydraulic distribu-
tor spool
Return the hydraulic control levers to the "neutral"
position after the operation is completed.
Consumption of implement hy-
draulic motors does
not match
the tractor pump flow
Use agricultural implements agreed with the man-
ufacturing company
Non-return of the draft control
unit lever from the “Raising” po-
sition to the “Neutral” position
Check the draft control unit mechanism from the
control lever to the draft control unit. Troubleshoot
To Next Page
Loading...
