952.5-0000010 OM
177
Malfunction, external manifestation Troubleshooting
Hydraulic lift linkage with draft control unit
The hitch with an agricultural implement doesn’t lift
No pressure in the hydraulic system:
•
hanging of by-pass valve
Pull out valve parts, wash and install them
inside body. Valve should move freely.
•
clogging of safety valve
Disassembly safety valve, wash and rein-
stall it. Adjust pressure of valve actuation.
•
Insufficient quantity of oil in the tank.
Fill the tank with oil up to recommended
level.
Loss of pump capacity
Check pump capacity and replace it, if
necessary
Length of governor control tie-rod is ou
of adjustment
Make adjustment, as given in section
“Adjustments”
Weight of agricultural implement exceeds
allowable for tractor lift linkage
Use agricultural implements agreed upon
with the manufacturer
No forced hitch lowering
Tie-rod of governor control is not correctly
adjusted.
Make adjustment, as given in section
“Adjustments”
Slow lifting of hitch with an agricultural implement
Speed correction valve is closed
Increase speed of automatic corrections by
turning handwheel contraclockwise
Air ingress in the hydraulic system.
Find out ingress site and correct defect
Loss of pump capacity
Check pump capacity and replace it, if
necessary
Weight of an agricultural implement ex-
ceeds allowable for tractor lift linkage
Use agricultural implements agreed upon
with the manufacturer
Oil foaming in the tank and splashing through breather
Air ingress in the system along inlet
manifold.
Tighten fastening and, if necessary,
replace gaskets of the suck -in manifold.
Air ingress through self-squeezed collars
of HLL oil pump of hitch hydraulic system or
HSC system pump.
Check condition of self-squeezing collars
and replace them, if necessary
Too high oil level in the tank
Drain excessive oil down to recommended
Excessive oil heating during system operation
Insufficient quantity of oil in the tank
Fill tank with oil up to recommended level
Bent or crushed oil lines.
Remove dents or replace oil line.
Disconnection of rod-type distributor valve
Replace rod-type valve
Hanging of hydraulic distributor control valve. Push hydraulic distributor levers to position
“neutral” upon operation completion.
Hydraulic motors of agricultural implement
don’t match in consumption to pump supply
Use agricultural implements agreed upon
with manufacturer.
