TM 9-4940-568-34
2-49
Table 2-7. Crane Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Test 1.
Remove five function control cover. Refer to paragraph 3-31. Disconnect the lines that
come from the swing clockwise and swing counterclockwise fittings on the swing control
valve. Install a flow meter in line between fittings. Open pressure control valve fully by
turning control knob counter clockwise to DECREASE. Start FRS. Have assistant operate
SWING control lever to attempt to swing clockwise and counter clockwise. Slowly close
pressure control valve by turning knob clockwise to INCREASE. Create 1,400-1,600 psi
(9,653-11,032 kPa) working pressure. Check for 8-9 gpm (30-34 lpm)
If pressure and flow is within specifications, go to Test 2.
If pressure and flow is not within specifications, ensure hydraulic pump is working
properly. Refer to paragraph 4-3. If fault is not corrected, repair SWING control
valve/shuttle valve circuit. Refer to paragraph 3-35.
CCW
CW
SWING
CONTROL
LEVER
