Belarus 892 - Possible Failures of Hydrostatic Steering Control and Guidelines for Troubleshooting

892-0000010B OM
296
7.9 Possible failures of hydrostatic steering control and guidelines for troubleshoot-
ing
List of possible failures of hydrostatic power steering and guidelines for troubleshoot-
ing are shown in Table 7.9.1.
Table 7.9.1
Defect, external manifestation, cause Troubleshootin
g
Increased force on the steering wheel
Pressure loss or insufficient pressure in steer-
ing control hydraulic system (it must be from
14.0 to16.0 MPa (steering wheel is turned up to
the stop)) due to the following reasons:
- HSC wasn’t bled
- faulty adjustment of dosing pump pressure re-
lief valve (low pressure)
- faulty feed pump (pump does not generate
pump due to low efficiency coefficient
)
Bleed air from the HSC hydraulic system by turn-
ing steering wheel with movement of guide
wheels from left-most to the right-most position
(stop stop-to-stop position) for 2-3 times
Contact the dealer. Adjust pressure relief valve for
the required pressure
1)
. Operation is performed
only by maintenance department
1)
.
Contact the dealer. Pump does not generate
p
um
p
due to low efficienc
y
coefficient.
Hard abrasion or blocking up in steering col-
umn mechanical components
Stop abrasion in steering column, for which per-
form the following:
-
loosen upper nut;
- lubricate friction surfaces of plastic bushings;
- eliminate contact of universal-joint fork with
steering column bracket walls
Steerin
g
wheel rotates without driven wheels turn
No oil in the oil tank. Fill the tank to the required level and bleed the
hydraulic system to remove air.
Disadjustment of dosing pump valves. Adjust-
ing pressure of pressure-relief valve exceeds
pressure of anti-shock valves
Contact the dealer. Adjust pressure-relief valve
and anti-shock valves up to the required pres-
sure. Operation is performed only by maintenance
department
1)
Worn out sealing of hydraulic cylinder pis-
ton.
Replace sealing or hydraulic cylinder
Steering if too slow and too hard in course of quick turning of steering wheel
Faulty feed pump Contact the dealer. Pump does not generate
pump due to low efficiency coefficient
Disadjustment of dosing pump pressure-relief
valve (set to law pressure or stuck in open po-
sition due to dirt accumulation)
Contact the dealer. Adjust pressure relief valve for
the required pressure. Operation is performed only
by maintenance department.
1)