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Grove
Published 01-14-2021 Control # 707-01
8-13
TMS9000-2 SERVICE MANUAL
CARRIER
8
Maintenance
Troubleshooting
SYMPTOM
PROBABLE CAUSE
SOLUTION
Oil leaking at output shaft of
steering gear.
Damaged sector shaft seal.
Replace sector shaft.
Oil leaking at actuating shaft
of steering gear.
Worn or damaged oil seal.
Replace actuating shaft seal.
Damaged actuating shaft seal surface.
Replace bearing cap, actuating shafts
assembly.
Oil leaking at supply pump
drive shaft.
Damaged oil seal.
Replace oil seal.
Oil seal-heat damaged.
Check operating temperature.
Loose or damaged bushing on pump drive
shaft.
Repair pump per pump service instruction.
Lubricant milky or white in
appearance.
Water entry through reservoir venting
system.
Clean vent system or replace cap assembly.
Oil forced out of reservoir or
foaming.
Clogged oil filter.
Change oil and oil filter.
Air in system.
Bleed air from the system. Check for air leak
on suction side of supply pumps.
Relief plungers of steering gear not
adjusted properly creating high operating
temperatures.
Adjust relief plungers.
Air leak in suction side of supply pump.
Reference pump servicing instruction.
Pump cavitation.
Check for restriction in pump supply.
Oil overheating.
Check for restriction in steering gear return.
Engine oil in power steering
reservoir (gear driven
pump).
Faulty seal at pump drive shaft.
Repair pump.
Faulty seal at accessory shaft driving supply
pump.
Repair accessory drive.
Lubricating oil discolored or
smells bad.
Operating temperatures too high.
Check and correct cause of overheating.
Change intervals too long.
Change oil more often.
Incorrect lubricant used.
Drain, flush, and refill with recommended
lubricant.
High operating
temperatures.
Oil flow restriction.
Check back pressure.
Oil flow too high.
Check maximum oil flow.
Excessive pump pressure
with steering gear in neutral.
Pinched oil return line, high back pressure.
Relocate line.
Binding steering column.
Repair steering column.
Wheel cuts restricted.
Relief plungers not adjusted properly.
Adjust relief plungers.
Erratic steering or
mechanical steering only.
Insufficient volume of oil.
Refer to pump servicing instructions.
Sticking pressure relief valve in steering
gear.
Repair or replace relief valve as required.
Hard steering.
Faulty supply pump.
Check pump flow.
Fo
r
Reference
Only