TM 5-3810-306-20
TABLE 3-1. ORGANIZATIONAL TROUBLESHOOTING (CONTD)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
47. BOOM WILL NOT LOWER
Step 1.
Defective main hydraulic relief valve.
a. Check main hydraulic relief valve adjustment. (Refer
to page 16-54.) If OK, do Step 2.
b. Contact Direct Support Maintenance to replace main
relief valve.
Step 2.
Control valve linkage out of adjustment.
a. Check valve linkage adjustment. If OK, do Step 3.
b. Adjust linkage to obtain full control valve spool
travel. (Refer to page 16-2.)
Step 3.
Defective hydraulic control valve.
a. Remove and inspect hydraulic control valve section.
If OK, do Step 4.
b. Replace hydraulic control valve section. (Refer to
page 16-2.)
Step 4.
Defective hydraulic pump.
a. Contract Direct Support Maintenance.
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