2122.6-0000010 OM
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6.11 Possible failures of the hydrostatic steering control and instructions for
their troubleshooting
The list of possible failures of the hydrostatic power steering and instructions for
their troubleshooting are shown in Table 6.11.1.
Table 6.11.2
Failure,
external manifestation, cause
Troubleshooting
Great effort at the steering wheel
No pressure or insufficient pressure
in the steering control hydraulic sys-
tem (it shall be from 14.0 to 15.5
MPa (steering wheel is turned up to
the stop)) due to the following rea-
sons:
- HSC was not bled
- faulty adjustment of dosing pump
pressure relief valve (low pressure)
- faulty feed pump (the pump fails to
increase pressure because of low
efficiency factor)
Bleed the HSC hydraulic system by turning the
steering wheel moving guide wheels from left-most
to the right-most position (stop-to-stop position) for
2-3 times
Contact the dealer. Adjust the pressure relief valve
for the required pressure. The operation shall be
performed only by maintenance department
1)
Contact the dealer for feed pump replacement or
repair
Hard abrasion or blocking up in
steering column mechanical com-
ponents
Stop abrasion in the steering column, for which do
the following:
- loosen upper nut;
- lubricate friction surfaces of plastic bushings;
- eliminate contact of universal-joint yoke with
steering column bracket walls
Increased torque of FDA reduction
unit turn
Make repair of FDA
Steering wheel is rotating without driven wheels turning
There is no oil in the tank
Fill the tank with oil to the required level and bleed
air from the hydraulic system of HSC
Improper adjustment of dosing
pump valves. Adjusting pressure of
the pressure-relief valve exceeds
the pressure of anti-shock valves
Contact the dealer. Adjust the pressure-relief valve
and anti-shock valves to the required pressure. The
operation shall be performed only by maintenance
department
1)
Worn-out sealings of the hydraulic
cylinder piston
Repair or replace the hydraulic cylinder
Deadlock of the dosing pump
shockproof valve in an open posi-
tion
Rinse the shockproof valve
Steering is too slow and too hard while quick turning of steering wheel
Faulty feed pump (the pump fails to
increase pressure because of low
efficiency factor)
Contact the dealer for feed pump replacement or
repair.
Improper adjustment of dosing
pump pressure-relief valve (set to
low pressure or stuck in the open
position due to dirt accumulation)
Contact the dealer. Adjust the pressure relief valve
for the required pressure. The operation shall be
performed only by maintenance department.
1)
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