TM 10-3930-641-34-1
STEERING SYSTEM TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4. STEERING WHEEL IS HARD TO TURN
Step 1. Allow hydraulic oil to warm up to normal operating temperature.
Step 2. Inspect pilot lines of hand metering unit for restrictions.
Clean or replace lines. (See TM 10-3930-641-20.)
Step 3. Check to see that pilot lines of hand metering unit are connected to the proper ports.
Reconnect pilot lines correctly. (See page 6-14.)
5. VEHICLE TURNS TOO SLOWLY IN ONE DIRECTION
Do a metering time check to determine the difference in steering times of left and right turns. (See page 6-74.)
a.
If turn to right is faster than left, add flow balance shims to flow balance valve.
b.
If turn to right is slower than turn to left, remove shims from flow balance valve. (See page 6-88.)
6. VEHICLE TURNS TOO SLOWLY IN EITHER DIRECTION
Step 1. Do a steering time check. Steering time should be no more than 2.6 to 3.0 seconds. (See page 6-74.)
Add shims to flow control valve to increase steering speed. (See page 6-24.)
Step 2. Test flow from primary steering pump. (See page 6-74.)
Repair pump. (See page 6-52.)
Step 3. Inspect flow balance spool to see if it moves all the way.
Replace spool. (See page 6-28.)
7. VEHICLE DOES NOT TURN SMOOTHLY
Step 1. Inspect flow control valve for free movement.
Repair or replace valve. (See page 6-28.)
Step 2. Hand metering unit supply line has been installed in steering valve body, in the field test port instead
of the correct port.
Install supply line in correct port. (See page 6-14.)
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