STEERING/HYDRAULIC SYSTEM TROUBLESHOOTING PROCEDURES
Table 1. Steering System Troubleshooting Procedures.
TEST OR INSPECTION
Do NOT remove hydraulic tank filler cap or disconnect or remove any hydrau-
lic system line or fitting unless hydraulic system pressure has been relieved.
Hydraulic system pressure can be over 2,500 psi (17,237 kPa), even with engine
and pump OFF. To relieve pressure, lower all hydraulic attachments to the
ground and shut down engine. Move control levers through all operating posi-
tions, then SLOWLY loosen hydraulic tank filler cap. After maintenance,
tighten all connections before applying pressure. Escaping hydraulic fluid under
pressure can penetrate the skin, causing injury or death.
At operating temperature, hydraulic oil is hot. Allow hydraulic oil to cool before
disconnecting any hydraulics. Failure to do so may cause injury.
Hydraulic oil is slippery and can cause falls. To avoid injury, wipe up spilled oil
Check for proper brake adjustments.
Check hydraulic reservoir fluid level
1. Fill reservoir if low.
in sight gage. If low, fill to proper level
2. If fluid level is OK, go to Test 3.
Check for leaks in cylinders, hoses,
1. Replace defective cylinders, hoses,
lines and fittings.
2. If no leaks are present, go to Test 4.
Check for obstructions and binding of
1. Remove any obstructions. Adjust
2. If linkage is OK, go to Test 5.
Check for activated differential lock
1. If differential lock pedal or parking/
pedal or parking/emergency brake.
emergency brake is activated, release
2. If differential lock is not activated, go to
Check relief valve.
1. If relief valve opens at a low oil pressure
or is damaged, replace (WP 0312 00).
2. Go to Test 7.
Check pilot valve of relief valve.
1. Replace pilot valve if closed, damaged
or defective (WP 0312 00).
2. If valve is OK, go to Test 8.
Check movement of flow control
1. If flow control valve sticks, or is
valve in steering control valve.
damaged or defective, replace (WP