892-0000010B OM
297
Table 7.9.1 continued
Defect, external manifestation, cause Troubleshootin
Releasing steering wheel does not cause depressurization in HSC
h
draulic s
stem
When releasing the steering wheel in both
end-point positions, there is no turn-through of
the steering wheel (by 20…30mm) in the op-
posite direction due to the action of dosing
pump springs (the spool does not return to the
neutral, the pressure in charge hydraulic line
does not drop) due to the following reason:
- excessive friction or blocking up of steering
drive mechanical components
Eliminate friction in the steering column, 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
drive column
End play between steering column splined
shank and dosing pump spool is too small or
not available
If the spline shank face protrudes more than 7.1
mm above the attachment plane of the steering
column bracket, install additional shims no more
than 1.5 mm thick between the dosing pump and
the bracket.
Steerin
wheel continue to rotate after turnin
Gripping of sleeve with spool (perhaps due to
dirt accumulation)
Contact the dealer. Rinse of dosing-pump compo-
nents is required. Assembly and check of operabil-
ity should be is performed only by maintenance de-
partment in accordance with manufacturer’s instruc-
tion
1)
Spool recentering springs of dosing pump
have lost spring power or are broken
Contact the dealer. Replacement of springs, assem-
bly and check of operability should be is performed
only by maintenance department in accordance with
manufacturer’s instruction
1)
Break of dosing pump air tightness throughout spool shank, socket casing
-
erotor twin
cover
Wear of spool sealing
Contact the deale
. Replacement of faulty sealing,
assembly and check of operability should be is
performed only by maintenance department in ac-
cordance with manufacturer’s instruction
1)
Loose dosin
-pump cover bolt Ti
hten bolts with torque of 30 to 35 Nꞏm
Damaged sealing disks under dosing-
pump cover bolt heads
Replace sealing disks
Wobblin
of steerable wheels when movin
Increased clearance in pins of steering
joints and
h
draulic c
linde
Tighten pin nuts and nuts of steering joints.
Worn-out mechanical
oints or bearin
s Replace worn-out components
ir in HSC hydraulic system
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
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