8-12
Published 01-29-2014, Control # 496-00
UNDERCARRIAGE TMS800E SERVICE MANUAL
STEERING SYSTEM
Description
The steering system is comprised of the steering gearbox,
steer pump, and two steer cylinders. The steering gearbox
provides for full time hydraulic steering, but still allows for
manual steering in the event of a system malfunction.
Maintenance
Table 8-1Troubleshooting
Symptom Probable Cause Solution
1. Oil leaking at output shaft of
steering gear.
a. Damaged sector shaft seal. a. Replace sector shaft.
2. Oil leaking at actuating shaft of
steering gear.
a. Worn or damaged oil seal. a. Replace actuating shaft seal.
b. Damaged actuating shaft seal
surface.
b. Replace bearing cap,
actuating shafts assembly.
3. Lubricating oil discolored or smells
bad.
a. Operating temperatures too
high.
a. Check and correct cause of
overheating.
b. Change intervals too long. b. Change oil more often.
4. High operating temperatures. a. Oil flow restriction. a. Check back pressure.
b. Oil flow too high. b. Check maximum oil flow.
5. Excessive pump pressure with
steering gear in neutral.
a. Pinched oil return line, high
back pressure.
a. Relocate line.
b. Binding steering column. b. Repair steering column.
6. Wheel cuts restricted. a. Relief plungers not adjusted
properly.
a. Adjust relief plungers.
7. Erratic steering or mechanical
steering only.
a. Insufficient volume of oil. a. Refer to pump servicing
instructions.
b. Sticking pressure relief valve
in steering gear.
b. Repair or replace relief valve
as required.
8. Hard steering. a. Faulty supply pump. a. Check pump flow.
b. Steering out of alignment. b. Align front end.
c. High operating temperature. c. Locate and correct cause of
overheating.
9. Wheel turns hard in one or both
directions.
a. Dirt or foreign matter trapped
in piston relief.
a. Check pressure relief.
b. Bent
or damaged king pins
and tie
rods.
b. Repair or replace king pins
and tie rods.
c. Front end load too great. c. Lighten load.
d. Low oil level in steering
system.
d. Fill oil reserve as required.
10. Wheel turns hard in one or both
directions.
a. Air in system. a. Bleed system and check for
cause of air.
Reference Only
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