TM 5-5420-280-23&P
0010 00
Hydraulic System Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
14. LAUNCH BOOM WILL NOT HOLD BRIDGE WHEN EXTENDED OVER GAP (L16-H) OR (R7-H)
NOTE
Pressure switch KF1 stops lower support boom lifting cylinder at
end of travel position.
Step 1. Check for sticking or damaged KF1 pressure switch.
Replace KF1 pressure switch if sticking or damaged. Refer to WP 0075 00.
Step 2. Check for damaged lifting cylinders.
Replace damaged lifting cylinders. Refer to WP 0096 00.
END OF TESTING
15. WHEEL LIFTING CYLINDERS WILL NOT LOWER OR RAISE
Step 1. Check that retaining pins are removed.
Remove retaining pins. Refer to TM 5-5420-280-10.
Step 2. Check for proper hydraulic oil level in reservoir.
Fill reservoir to proper oil level. Refer to WP 0016 00.
Step 3. Check position of selector valve.
Place selector valve lever in one of three positions to lower/raise front, rear, or all wheel
lifting cylinders. Refer to TM 5-5420-280-10.
Step 4. Check position of control valve.
Place control valve lever in wheels-lowered or wheels-raised position. Refer to
TM 5-5420-280-10.
Step 5. Check that hydraulic pump operates and apply pressure to wheel lifting cylinders as shown
on gauge. Refer to TM 5-5420-280-10.
Step 6. Check that wheel lifting cylinder operates after performing steps 1 through 5.
If no pressure is shown on gauge, replace hydraulic pump. Refer to WP 0081 00.
END OF TESTING
END OF WORK PACKAGE
