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OUTER BOOM CYLINDER DRIFTS WHEN LOADED AND CONTROLS IN NEUTRAL.
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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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FRONT LOADER WILL NOT RAISE OR LOWER.
TM 5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
CRANE (HMMH) (CONT)
d.
Start engine. Move control lever to extend outer boom cylinder (1) and
check for oil leak from fitting (3).
If there is leakage from fitting, replace outer boom cylinder
(page 4-696).
If there is no leakage from fitting, stop engine and go to
step e.
e.
Remove threaded plug from hose (2) and install hose on outer boom
cylinder (1).
f.
Start engine, retract outer boom cylinder completely, and stop engine.
Disconnect hose (4) from outer boom cylinder (1) and install threaded
g.
plug.
h.
Start engine. Retract outer boom cylinder (1) and check for oil leak from
fitting (5j.
If there is leakage from fitting, replace outer boom cylinder
(page 4-696).
If there is no leakage from fitting, go to step 2.
Step 2. Check outer boom cylinder holding valve as follows:
a. Start engine. Set auxiliary throttle switch (6) to CRANE.
b. Lift load. Allow control lever to go to neutral.
c. Set auxiliary throttle switch (6) to IDLE. Stop engine.
d. Move control lever to attempt to lower load to floor.
If load lowers any amount, replace outer boom cylinder
(page 4-696).
If load does not lower, notify direct support maintenance.
FRONT LOADER (SEE)
138. FRONT LOADER OPERATES SLOW.
Check for loose and damaged hydraulic lines.
If hydraulic lines are loose or damaged, tighten loose
connections or replace hydraulic lines (pages 4-569, 4-572,
4-574, 4-576, 4-578, 4-580, 4-582, 4-584, 4-586, 4-588).
If hydraulic lines are not loose or damaged, notify direct
support maintenance.
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