TM 5-3810-306-34
TABLE 3-1. DIRECT AND GENERAL SUPPORT TROUBLESHOOTING (CONTD)
Malfunction
Test or Inspection
Corrective Action
67.
EXCESSIVE HOIST MOTOR NOISE
Step 1. Worn or damaged internal parts.
a.
Disassemble to remove rotor, vane, cam ring assembly. (Refer to page 15-54.)
b.
Inspect for excessive wear.
c.
Check condition of faces of port plate and end cap.
d.
Rework (lap) or replace if scuffed.
68.
BOOM SWING OPERATION ERRATIC IN EITHER DIRECTION
Step 1. Defective swing motor.
a.
Repair or replace swing motor. (Refer to page 15-133.)
Step 2. Improperly torqued swing motor attachment bolts.
a.
Check torque on bolts. (Refer to TM 5-3810-306-20.) If OK, do Step 3.
b.
Torque swing motor attachment bolts.
Step 3. Defective swing box.
a.
Remove swing box and make necessary repairs. (Refer to page 15-116.)
Step 4. Defective two-section hydraulic pump section.
a.
Repair or replace damaged section. (Refer to page 13-26.)
69.
BOOM SWING OPERATION ERRATIC IN ONE DIRECTION ONLY
Step 1. Damaged swing pinion.
a.
Replace swing pinion. (Refer to page 15-116.)
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