CRANE OPERATION UNUSUALLY NOISY.

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).

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