80-0000010B OM
365
End of Table 7.11.1
Failure,
external manifestation, cause
Troubleshooting
Spool recentering springs of dos-
ing pump have lost spring power or
are broken
Contact your dealer. Replacement of springs, assembly
and check of operability shall be performed only by
maintenance department in accordance with the manu-
facturer’s instructions
1)
Releasing steering wheel does not cause depressurization in HSC hy-
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 opposite 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 compo-
nents
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 steer-
in
drive column
Increased pla
in the steerin
wheel
Tapered pins of the hydraulic cyl-
inder or the steering link are not
tightened
Tighten pin nuts with a torque of 180 to 200 Nꞏm and
secure by split pin
Increased play in cardan connec-
tions of steering wheel drive
Replace worn-out parts
Spool recentering springs of dos-
ing pump have lost spring power
or are broken
Contact your dealer. Replacement of springs, assem-
bly and check of operability shall be performed only by
maintenance department in accordance with manufac-
turer’s instruction
1)
1)
Considering extreme complexity and responsibility of the dosing pump from the point of
view of steering system safety, its assembly and disassembly shall be carried out only by
servicing personnel of manufacturing company (or other authorized maintenance depart-
ment), properly trained, having studied dosing pump design and service and dosing pump
assembly-disassembly manuals, and provided they have all the required service tools, ac-
cessories and a special hydraulic stand, ensuring adjustment and check of dosing pump pa-
rameters and operability after the repairs have been made. Otherwise, a person performing
the dosing pump assembly and disassembly, replacement of parts and components or ad-
justment of valves, as well as the tractor owner, bears full responsibility for dosing pump
non-operability.
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