TM 5-3810-306-34
TABLE 3-1. DIRECT AND GENERAL SUPPORT TROUBLESHOOTING (CONTD)
Malfunction
Test or Inspection
Corrective Action
48. BOOM WILL NOT LOWER
Step 1.
Broken pump shaft.
a. Inspect pump shaft. If OK, do Step 2.
b. Replace pump shaft and seals. (R efer to page 13-12.)
Step 2.
Broken pump drive coupling.
a. Inspect pump drive coupling. If OK, do Step 3.
b. Replace drive coupling. (Refer to page 13-10.)
Step 3.
Defective hydraulic pump.
a. Repair or replace hydraulic pump. (Refer to
49. ERRATIC OPERATION OF EXTENDING TELESCOPING CYLINDER
Step 1.
Worn boom wear pads.
a. Replace wear pads. (Refer to page 15-8.)
Step 2.
Distorted boom section.
a. Inspect boom. If OK, do Step 3.
b. Replace distorted section. (Refer to page 15-8.)
Step 3.
Damaged telescope cylinder.
a. Repair or replace cylinder. (Refer to page 13-108.)
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