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BUCKET ROLLBACK CYLINDER DRIFTS. cont'd
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TM-5-2420-224-20-1 Tractor Wheeled 4x4 DED Small Emplacement Excavator (SEE) and High Mobility Material Handler (HMMH) Manual
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TM 5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
FRONT LOADER (SEE) (CONT)
144. LOAD DROPS WITH CONTROL VALVE IN NEUTRAL.
Step 1. Check for loose and damaged hydraulic lines.
If hydraulic lines are loose or damaged, tighten loose
connections or replace hydraulic lines (page 4-582).
If hydraulic lines are not loose or damaged, go to step 2.
Step 2. Check control linkages for proper adjustment.
If control linkages are not properly adjusted, adjust control
linkages (page 4-532).
If control linkages are properly adjusted, go to step 3.
Step 3. Check load drop rate as follows:
a. Load bucket with 1,000 lb.
b. Start engine and cycle oil until oil is at operating temperature of 120 F
(49 C).
Lift load 3-4 ft (0.9-1.2 m) off ground. Stop engine.
c.
NOTE
Maximum allowable drop is 1 ft.
d. Allow load to stay suspended for 10 minutes.
If load drops more than 1 ft, replace relief valve (page 4-568).
If problem continues, notify direct support maintenance.
145. CONTROL VALVE STICKS OR WORKS HARD.
Check control linkages for proper adjustment.
If control linkages are not properly adjusted, adjust control
linkages (page 4-532).
If control linkages are properly adjusted, notify direct support
maintenance.

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