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INNER BOOM LIFT CYLINDER DRIFTS.
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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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INNER BOOM LIFT CYLINDER DRIFTS. cont'd -680640445
TM
5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
CRANE (HMMH) (CONT)
NOTE
Step c is for passenger side inner boom lift cylinder.
Step d is for driver side inner boom lift cylinder.
Use threaded plugs in hoses in steps c, d, h, and i. Failure to do so will result in
spilled hydraulic oil.
Remove lower hose (3) from passenger side inner boom lift cylinder (1)
c.
and install threaded plug in hose.
d. Remove upper hose (4) from driver side inner boom lift cylinder (2) and
install threaded plug in hose.
e. Start engine. Move control lever to extend inner boom lift cylinders
(1 and 2) and check for oil leak from fittings (5).
If there is leakage from fittings, replace inner boom lift cylinder
(page 4-692).
If there is no leakage from fittings, stop engine and go to
step f.
f.
Remove threaded plugs from hoses (3 and 4) and install hose on inner
boom lift cylinders (1 and 2).
g. Start engine, retract inner boom lift cylinder completely, and stop engine.
NOTE
Step h is for passenger side inner boom lift cylinder.
Step i is for driver side inner boom lift cylinder.
h. Remove upper hose (6) from passenger side inner boom lift cylinder (1)
and install threaded plug.
i.
Remove lower hose (7) from driver side inner boom lift cylinder (2) and
install threaded plug.
Start engine. Retract inner boom lift cylinders (1 and 2) and check for
j.
oil leak from fittings (8).
If there is leakage from fittings, replace inner boom lift cylinder
(page 4-692).
If there is no leakage from fittings, go to step 2.
3-312

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