BELARUS-1021/1021.3
Operating manual
137
7.9 Troubleshooting of hydraulic linkage system
Trouble, its manifestation
Remedy
1. Hitch without a load does not rise, when any of the control levers of the extension
cylinder distributor is set to the position of lifting or lowering, the characteristic sound
emitted by the pump under load is not heard
Contamination of the safety valve of the
tractor distributor.
Disassemble and rinse the safety valve.
Adjust the pressure maintained by the safety
valve.
2. Hitch without a load does not rise, when any of the control levers of the extension
cylinder distributor is set to the position of lifting or lowering, the characteristic sound
emitted by the pump under load is heard After stopping the position engine, shifting the
lever to the forward position, then to the rear position and starting the engine, the hitch
rises (the power lever must be in the forward position).
Clogged jet hole in the relief valve.
Unmount the regulator distributor from the
tractor, take out the bypass valve, rinse the
valve, clean the jet hole of the valve.
3. Hitch without a load does not rise, when any of the control levers of the extension
cylinder distributor is set to the position of lifting or lowering, the characteristic sound
emitted by the pump under load is heard After stopping the engine, shifting the position
lever to the forward position, then to the rear position and starting the engine, the hitch does
not rise (the power lever must be in the forward position).
Foreign particles under the edges of the
spool.
Remove the cover from the regulator
distributor, set the positional lever in to the
forward position. The spool retaining ring must
rest against the housing of the regulator
distributor. Shift the position lever to the rear
position. The spool must travel up by at least 7
mm. In case of shorter travel, unmount the
regulator distributor, remove the foreign
particles stuck between the edges of the spool
and the housing.
4. Hitch with a load does not rise or rises slowly
Fault manifests itself as the oil in the
hydraulic system warms up — faulty pump.
Check the pump performance. If coefficient
of performance of the pump is less than 0.7 —
replace the pump.
Fault appears at any oil temperature —
clogged relief valve.
Unmount the regulator distributor, take out
the bypass valve, rinse it and the housing in
diesel fuel.
5. Hitch with a load rises slowly, after stopping the engine spontaneously lowers
noticeable to the eye, frequent position correction, possible “freeze” of the pressure.
Destroyed rubber seals of the regulator
distributor.
Unmount the regulator distributor, replace
rubber seals with new ones.
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Страница 1: ...BELARUS 1021 1021 3 1021 0000010 OM OPERATING MANUAL Minsk Tractor Works 2010 ...
Страница 16: ...BELARUS 1021 1021 3 Operating manual 15 The transmission number Front driving axle number Cab serial number ...
Страница 107: ...BELARUS 1021 1021 3 Operating manual 106 Fig 6 9 2 Determining maximum allowable torque Power kW hp Speed rpm Torque Nm ...