TM 9-4940-568-34
2-37
Table 2-7. Crane Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Test 1.
Remove the line that comes from the outrigger beam extend fitting at the middle 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 O/R EXT. control lever to attempt to extend outrigger beam.
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 beam
extend/retract cylinder. Refer to paragraph 3-8 or 6-2.
If pressure is not within specifications, repair or replace outrigger control
valve/shuttle valve circuit. Refer to paragraphs 3-34 or 3-35. If fault is not
corrected, repair or replace outrigger beam extend/retract cylinder. Refer to
paragraph 3-8 or 6-2.
