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CRANE CONTROLS WILL NOT RESPOND.
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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.
TM 5-2420-24-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
CRANE (HMMH) (CONT)
133. CRANE OPERATION UNUSUALLY NOISY.
Step 1.
Check for low oil level in rear hydraulic tank.
If oil level is low, add oil (TM 5-2420-224-10).
If oil level is not low, go to step 2.
Step 2.
Check for improperly lubricated cylinder pivot pins.
If pivot pins are not properly lubricated, lubricate pivot pins
(TM 5-2420-224-10).
If pivot pins are properly lubricated, go to step 3.
Step 3.
Check condition of rear hydraulic tank filters.
If rear hydraulic tank filters are unserviceable, change rear hydraulic
tank filters (page 4-720).
If rear hydraulic tank filters are serviceable, go to step 4.
Step 4.
Check for loose and damaged hydraulic lines.
If hydraulic lines are loose or damaged, tighten loose connections
or replace hydraulic lines (pages 4-632, 4-634, 4-636, 4-638, 4-640,
4-642, 4-644, 4-646, 4-648).
If hydraulic lines are not loose or damaged, notify direct support
maintenance.
134. VERTICAL OUTRIGGER CYLINDER YIELDS OR DRIFTS.
NOTE
Step is the same for both vertical outrigger cylinders.
Check for leaking and damaged hydraulic lines.
If hydraulic lines are leaking or damaged, tighten loose connections or
replace hydraulic lines (page 4-648).
If hydraulic lines are not leaking or damaged, replace vertical
outrigger cylinder (page 4-700).
135. HORIZONTAL OUTRIGGER CYLINDER WILL NOT RETRACT.
NOTE
Step is the same for both horizontal outrigger cylinders.
Check for leaking and damaged hydraulic lines.
If hydraulic lines are leaking or damaged, tighten loose connections
or replace hydraulic lines (page 4-646).
If hydraulic lines are not leaking or damaged, replace horizontal
outrigger cylinder (page 4-698).
Change 2

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