1523.5-0000010 OM
192
Table 6.11 finished
Failure,
external manifestation, cause
Troubleshooting
Wobbling of driven wheels when moving
Conic-shaped pins of HSC hydraulic
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 service”
Worn-out mechanical joints or bear-
ings
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, as-
sembly and check of operability shall be performed only
by maintenance department in accordance with manu-
facturer’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 service”
Partial steering angle of driven wheels
Insufficient pressure in the HSC hy-
draulic system due to the following
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 steer-
ing torque
Make repair of FDA
Breakdown of feed pump
High pressure in the HSC hydraulic
system due to the following reasons:
- Incorrect high-pressure hose con-
nection
- locking of the back-pressure valve
or dosing pump pressure relief valve
(possible due to dirt accumulation)
Contact the dealer. Rinse of dosing-pump components
is required. Assembly and check of operability shall be
performed only by maintenance department in accord-
ance 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 manufacturing 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 required service tools, accessories and special hydraulic
stand, ensuring adjustment and check of dosing pump parameters and operability after the re-
pairs have been made. Otherwise, a person performing the dosing pump assembly and disas-
sembly, replacement of parts and components or adjustment of valves, as well as a tractor
owner, bears full responsibility for dosing pump non-operability.
