FOUR VALVE BANK FUNCTIONS (SWING, LIFT, TELESCOPE AND HOIST) DO NOT OPERATE OR OPERATE SLOWLY.

TM 9-2320-364-34-1

2-15. MATERIAL HANDLING CRANE TROUBLESHOOTING (CONT).

4. FOUR VALVE BANK FUNCTIONS (SWING, LIFT, TELESCOPE AND HOIST)

DO NOT OPERATE OR OPERATE SLOWLY.

INITIAL SETUP

Tools and Special Tools

References

Tool Kit, General Mechanic's

TM 9-2320-364-10

Equipment Condition

Materials/Parts

Engine OFF, (TM 9-2320-364-10)

Wire, Nonelectrical (Item 79, Appendix B)

Parking brake applied, (TM 9-2320-364-10)

Wheels chocked, (TM 9-2320-364-10)

Outriggers down with weight off

vehicle suspension, (TM 9-2320-364-10)

START

KNOWN INFO

TEST OPTIONS

Can MHC SYSTEM

Unit Troubleshooting

Operation test.

tasks completed.

HYDRAULIC PRESSURE

Outriggers operate.

REASON FOR QUESTION

MANUAL OVERRIDE push

button be pushed in?

If MHC SYSTEM HYDRAULIC

POSSIBLE PROBLEMS

PRESSURE valve is faulty, fluid

going to four valve bank will be

Solenoid valve assembly faulty.

restricted.

Four valve bank faulty.

Repair solenoid valve

assembly

(Para 16-34).

Verify repair, go to

Step 5 of this Fault.

YES

2-474