TM 5-3805-298-23-2
0148
Table 1. Boom Will Not Lower - Continued.
0148
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Boom Will Not Lower -
2. Push implement disable switch to
Continued
lock position (TM 5-3805-298-10).
3. Observe boom for movement.
Boom Raises Turn ignition switch
and battery disconnect switch to OFF
position (TM 5-3805-298-10). Replace
valve group bank 3 (WP 0371).
Proceed to Test Step 4.
Boom Does Not Move Replace ride
control valve (WP 0376).
Proceed to Test Step 3.
Test Step 3. Verify Malfunction Is
Resolved.
1. Turn battery disconnect switch to
ON position and start engine
(TM 5-3805-298-10).
2. Warm the transmission oil to
normal operating temperature of
approximately 165F to 185F
(75C to 85C).
3. Warm the hydraulic oil to operating
temperature of 140F (60C)
(TM 5-3805-298-10).
4. Operate machine to lower boom
Boom Lowers Troubleshooting
(TM 5-3805-298-10).
complete.
Boom Does Not Lower Replace pilot
valves (WP 0379).
Proceed to Test Step 4.
Test Step 4. Verify Malfunction Is
Resolved.
1. Turn battery disconnect switch to
ON position and start engine
(TM 5-3805-298-10).
2. Warm the transmission oil to
normal operating temperature of
approximately 165F to 185F
(75C to 85C).
3. Warm the hydraulic oil to operating
temperature of 140F (60C)
(TM 5-3805-298-10).
4. Operate machine to lower boom
Boom Lowers Troubleshooting
(TM 5-3805-298-10).
complete.
Boom Does Not Lower Repeat
troubleshooting from the beginning.
END OF WORK PACKAGE
0148-3/(4 blank)
