TROUBLESHOOTING PROCEDURES (NON-ERROR CODE) - CONTINUED
Table 7. Boom System Troubleshooting Procedures (Non-Error Code).
TEST OR INSPECTION
1. Boom Will Not Lift or Lower Properly.
1. Check for active boom system Perform troubleshooting
procedures to clear error code(s)
2. Check hydraulic oil level. Fill hydraulic oil as required (WP
Ensure hydraulic oil level is 0050 00).
within operating range (WP
3. Ensure boom locked (red) Use the override switch to move
twistlock indicator light is on. twistlocks into proper position
4. Inspect lift cylinders for a. Remove any obstructions.
obstructions, damage, and b. Replace damaged or leaking
signs of leakage.
cylinders (WP 0252 00).
5. Check lift cylinder hydraulic a. Tighten loose connections.
lines and hoses for damage and b. Replace damaged or leaking
signs of leakage.
lines and hoses (WP 0182 00).
6. Ensure lift cylinder emergency Close emergency and float valves
and float valves are in closed as required (TM 10-3930-675-
7. Check boom and tophandler Calibrate boom and tophandler as
required (WP 0259 00).
8. Check test boom control a. If boom system operates
system. Operate the auxiliary
normally, the boom control
pump using the procedure
system is not at fault, check
"Lower Boom (Extended or
boom and brake pump
Loaded with a Container)"
pressure (WP 0188 00).
(TM 10-3930-675-10) to test b. If boom system does not
boom control system. (The
operate normally, check boom
boom movements will be
9. Test boom system operating a. If test point 9 pressure is not
pressures at test points 8 and 9
normal, replace servo pressure
(WP 0188 00).
reducing valve first, then the
servo control valve (WP 0250
00) if needed.
b. If boom will extend and retract
normally, but not lift or lower,
replace the main control valve
assembly (WP 0249 00).