Ing - Belarus 80.1 Operation Manual

7.12 Possible failures of hydraulic lift linkage and instructions for trouble-
shooting
A list of possible failures of the hydraulic lift linkage and instructions for their trou-
bleshooting are given in Table 7.12.
Table 7.12
Failure,
external manifestation, cause
RLL with agricultural implement attached will not rise
No pressure in the hydraulics:
 sticking of bypass valve;
 clogging of safety valve;
 insufficient amount of oil in the
tank.
Loss of pump efficiency
Regulator control rod length is
maladjusted
Weight of the implement exceeds
the allowable value for the tractor
lift linkage
Regulator control rod is improper-
ly adjusted
Slow rise of lifting linkage with agricultural implement attached
Air suction into the hydraulic sys-
tem
Loss of pump performance
Weight of the implement exceeds
the allowable value for the tractor
lift linkage
Oil foaming in oil tank and spitting through the breather
Air suction into the hydraulic sys-
tem through the suction line
Air suction through self-tightening
cuffs of the HLL oil pump
Oil level in the tank is too high
Insufficient oil in the tank
Oil lines bent or crumpled
Sticking of spool of hydraulic dis-
tributor
Hydraulic motors of the imple-
ment are not in agreement with
the tractor pump feed in terms of
consumption
Remove the valve parts, rinse and install into the
body. The valve must move freely
Disassemble the safety valve, rinse, reinstall. Adjust the
valve actuation pressure.
Add oil to the tank to the recommended level
Check pump performance, replace if necessary.
Adjust
Use agricultural implements, as agreed with the manu-
facturer
No forced lift linkage lowering
Adjust
Identify place of suction and eliminate the failure
Check pump performance, replace if necessary.
Use agricultural implements, as agreed with the manu-
facturer
Tighten the connection and replace the gaskets of
suction pipe branch if necessary
Check condition of self-tightening cuffs and replace if
necessary.
Drain excess oil to recommended level.
Increased oil heating during system operation
Add oil to the tank to the recommended level.
Repair the crumples or replace oil line
Return the levers of hydraulic distributor to the neutral
position after finishing the operation
Apply implements as agreed with the manufacturer
Troubleshooting
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80-0000010B OM