80-0000010B OM
361
Table 7.9.1 continued
Failure,
external manifestation, cause
Troubleshooting
Steering wheel fails to turn back (by 20…30 mm) when the effort is taken off
the steerin
wheel after turnin
Excessive friction or sticking in
steering column’s mechanical
components
Stop friction in steering column by doing the following:
- loosen upper nut;
- lubricate friction surfaces of plastic bushings;
- eliminate contact of cardan-
oint yoke with steering
column bracket walls.
The springs that return the spool of
dosing pump to the neutral position
have lost their flexibility or are bro-
ken
Contact the dealer. Replacement of springs, assembly
and performance check shall be carried out by the
maintenance department in compliance with the instruc-
tions of the manufacturer
1)
Steerin
wheel
oes on rotatin
after the turn was finished
Gripping of sleeve with the spool
(possible due to dirt accumulation)
Contact the dealer. Rinsing of dosing-pump compo-
nents is required. Assembly and check of operability
shall be performed only by maintenance department in
accordance with manufacturer’s instruction
1)
Spool recentering springs of dos-
ing pump have lost spring flexibility
or are broken
Contact the dealer. Replacement of springs, assembly
and check of operability shall be performed only by
maintenance department in accordance with manufac-
turer’s instruction
1)
The spline drive of the steering
column and the dosing pump are
mounted out-of-line or with an in-
sufficient side clearance
Loosen four bolts retaining the dosing pump on the
steering column. To expand the clearance set max. 1,5
mm thick additional washers between the dosing pump
and the steering column bracket. Tighten the bolts with
a torque of 20 to 25 Nꞏm.
Loss of tightness of dosing pump at spool shaft end, at slot housing
gerotor pair
cover
Worn-out sealing of spool Contact the dealer. Replacement of faulty seals, as-
sembly and check of operability shall be performed
only by maintenance department in accordance with
manufacturer’s instruction
1)
Loosened tightening of doser
cover bolts
Tighten the bolts with the torque of 30 to 35 Nꞏm
Wobblin
o
steered wheel durin
movement
Cone pins of HSC hydraulic cyl-
inders or steering link are not
tightened
Tighten pin nuts
Increased play in steering joints Eliminate play in steering joints as indicated in section 6
“Technical maintenance”
Worn-out mechanical joints or
bearings
Replace worn-out components
Air presence in the HSC hydraulic
system
Bleed air from the HSC hydraulic system by turning
the steering wheel with moving guide wheels from the
left-most to the right-most position (stop-to-stop posi-
tion
for 2-3 times
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