2122.6-0000010 OM
224
End of table 6.11.1
Failure,
external manifestation, cause
Troubleshooting
Wobbling of driven wheels when moving
Conic-shaped pins of HSC hydrau-
lic cylinders are not tightened
Tighten pin nuts
There is clearance in steering
joints
Eliminate the clearance in steering joints, as indicated
in section 5 “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 moving guide wheels from the left-
most to the right-most position (stop-to-stop position)
for 2-3 times
Break of dosing pump air tightness throughout spool end extension, socket casing -
gerotor pair – cover
Wear of spool sealing
Contact the dealer. Replacement of faulty sealing,
assembly and check of operability shall be performed
only by maintenance department in accordance with
manufacturer’s instruction
1)
Loose dosing-pump cover bolt
Tighten the bolts with torque of 30 to 35 N·m
Damaged sealing gaskets under
the dosing pump cover bolt heads
Replace the gaskets
Different minimum minimal radius of tractor turning to the left and to the right
Faulty toe-in of front wheels
Adjust toe-in of front wheels as specified in section 5
“Maintenance”
Partial steering angle of driven wheels
Insufficient pressure in the HSC
hydraulic system due to the follow-
ing reasons:
- faulty adjustment of dosing pump
pressure relief valve (low pressure)
- faulty feed pump (the pump fails
to increase pressure because of
low efficiency factor)
Contact the dealer. Adjust the pressure relief valve for
the required pressure
1)
. The operation shall be per-
formed only by maintenance department.
Contact the dealer.
Increased FDA reduction unit
steering torque
Make repair of FDA
Breakdown of feed pump
High pressure in the HSC hydraulic
system due to jamming of the
back-pressure valve or the pres-
sure relief valve of the dosing
pump in an open position (possible
due to dirt accumulation)
Contact the dealer. Rinse 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)
_________________________________________________________________________
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 manufac-
turing company (or other authorized maintenance department), properly trained, studying dosing pump
design and service and dosing pump assembly-disassembly manuals, and provided they have all re-
quired service tools, accessories and special hydraulic stand, ensuring adjustment and check of dosing
pump parameters and operability after the repairs have been made. Otherwise, a person performing the
dosing pump assembly and disassembly, replacement of parts and components or adjustment of valves,
as well as a tractor owner, bears full responsibility for dosing pump non-operability.
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