TM 5-3810-306-20
TABLE 3-1. ORGANIZATIONAL TROUBLESHOOTING (CONTD)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
59. BOOM SWING OPERATION ERRATIC IN ONE DIRECTION ONLY
Step 1.
Defective main hydraulic relief valve.
a. Check relief valve adjustment. (Refer to page 16-54.)
If OK, do Step 2.
b. Contact Direct Support Maintenance to replace relief
valve.
Step 2.
Turntable bearing binding due to continuous limited swing.
(Example: concrete pourer.)
a. Rotate crane 360 degrees in both directions several
times and lubricate turntable bearing. (Refer to TM
5-3810-306-10 and LO 5-3810-306-12.)
Step 3.
Restricted hydraulic hose or fitting.
a. Remove and inspect hydraulic hoses and fittings. If
OK, do Step 4.
b. Replace hydraulic hose or fitting. (Refer to page
16-18.)
Step 4.
Defective swing system.
a. Contact Direct Support Maintenance.
60. BOOM WILL NOT SWING IN EITHER DIRECTION
Step 1.
Defective main hydraulic relief valve.
a. Check relief valve adjustment. (Refer to page 16-54.)
If OK, do Step 2.
b. Contact Direct Support Maintenance to replace relief
valve.
Step 2.
Defective swing system.
a. Contact Direct Support Maintenance.
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