Belarus 892 - Possible Failures of the Hydraulic Lift Linkage and Guidelines for Troubleshooting

892-0000010B OM
299
7.10 Possible failures of the hydraulic lift linkage and guidelines for troubleshooting
List of possible failures of the hydraulic lift linkage and guidelines for troubleshooting
are shown in Table 7.10.
Table 7.10
Defect, external manifestation, cause Troubleshootin
g
The hitch with an a
g
ricultural 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 capacit
y
Check pump capacity and replace it, if
necessar
y
Length of governor control tie-rod is out
of ad
j
ustment
Make adjustment
Weight of agricultural implement ex-
ceeds
allowable for tractor lift linka
g
e
Use agricultural implements agreed upon
with the manufacturer
No forced hitch lowering
Tie-rod of governor control is not correctly
ad
j
usted.
Make adjustment
Slow liftin
g
of hitch with an a
g
ricultural implement
A
ir ingress in the hydraulic system.
Find out ingress site and correct defect
Loss of pump capacit
y
Check pump capacity and replace it, if
necessar
y
Weight of an agricultural implement ex-
ceeds allowable for tractor lift linkage
Use agricultural implements agreed upon
with the manufacturer
Oil foamin
g
in the tank and splashin
g
throu
g
h breather
A
ir ingress in the system along inlet
manifold.
Tighten fastening and, if necessary,
replace gaskets of the suck -in manifold.
A
ir 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 tan
k
Drain excessive oil down to recommended
Excessive oil heating during system operation
Insufficient quantit
y
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-t
y
pe distributor valve Replace rod-t
y
pe 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.