Belarus 820 - 7.11 Possible failures of the hydrostatic steering control with HPS housing and instructions for troubleshooting

80-0000010B OM
364
7.11 Possible failures of the hydrostatic steering control with HPS housing
and instructions for troubleshooting
The list of possible failures of the hydrostatic steering control with HPS housing and
instructions for troubleshooting are given in Table 7.11.1.
Table 7.11.1
Failure,
external manifestation, cause
Troubleshooting
Great effort at the steerin
g
wheel
No pressure or insufficient pressure
in the charge hydraulic line of steer-
ing control (it should make from
14.5 to 16.0 MPa when turning the
steering wheel against the stop) due
to the following reasons:
- HSC hydraulic system was not bled
- faulty adjustment of dosing pump
safety valve (low pressure)
- faulty feed pump (the pump fails to
increase pressure because of low
volume efficiency)
Bleed the HSC hydraulic system by turning the
steering wheel and moving guide wheels from left-
most to the right-most position position (stop-to-stop
position) for 2-3 times
Contact your dealer. The safety valve needs to be ad-
justed for the required pressure
1)
. The operation shall
be performed by maintenance department.
1)
Contact your dealer. The pump fails to increase
pressure because of low volume efficiency
Excessive friction or blocking up of
steering drive mechanical compo-
nents
Eliminate friction in the steering drive, which re-
quires the following:
- reduce rate of tightening of the upper nut;
- grease friction surfaces of plastic bushings;
- eliminate contact of cardan yokes on sides of
the steerin
g
drive bracket
Rotatin
g
the steerin
g
wheel does not turn the
g
uide wheels
No oil in HSC housing Fill the HPS housing with oil to reach the required
level and bleed the HSC hydraulic system
Faulty adjustment of dosing pump
valves. Safety valve adjustment
pressure is higher than anti-shock
valves’ ad
j
ustment pressure
Contact your dealer. It is necessary to adjust safety
and anti-shock valves to the required pressure. The
operation shall be performed by the maintenance
department
1)
Seals of steering hydraulic cylinder
piston are worn out
Repair or replace the hydraulic cylinde
r
Dosin
g
pump fault
(
steerin
g
wheel
g
oes on rotatin
g
after the turn
)
Gripping of sleeve with the spool
(possibly due to contamination)
Contact your dealer. It is needed to rinse the dosing
pump parts. Assembly and check of operation shall
be performed by the maintenance service in ac-
cordance with the manufacturer’s instructions
1)