TM 9-4940-568-34
2-41
Table 2-7. Crane Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Test 2.
Disconnect the line that comes from the outrigger jack cylinder retract fitting at the left jack
control valve of three valve bank assembly. Install a flow meter in line between control
valve and line. Open pressure control valve fully by turning control knob counter clockwise
to DECREASE. Start FRS. Have assistant operate LH O/R JACK control lever to attempt
to retract outrigger jack cylinder. Slowly close pressure control valve by turning knob
clockwise to INCREASE. Create 3,000 - 3,200 psi (20,684 to 22,063 kPa) working
pressure.
If pressure is within specifications, repair or replace outrigger jack cylinder. Refer
to paragraphs 3-9 or 6-3.
If pressure is not within specifications, repair or replace control valve/shuttle valve
circuit. Refer to paragraphs 3-7 or 3-35. If fault is not corrected, repair or replace
outrigger jack cylinder. Refer to paragraphs 3-9 or 6-3.
OUTRIGGER
JACK
RETRACT
LH O/R JACK
CONTROL
LEVER
