OVERLOAD SHUTDOWN SYSTEM (OSS) DISABLES CRANE FUNCTIONS, BOOM UP, BOOM DOWN, TELESCOPE OUT AND HOIST UP.

TM 9-2320-364-34-1

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

22. OVERLOAD SHUTDOWN SYSTEM (OSS) DISABLES CRANE FUNCTIONS,

BOOM UP, BOOM DOWN, TELESCOPE OUT AND HOIST UP.

INITIAL SETUP

Tools and Special Tools

References

Tool Kit, General Mechanic's

TM 9-2320-364-10

(Item 240, Appendix F)

Equipment Condition

OSS Tester (Item 142, Appendix F)

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

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

Materials/Parts

Cable Ties (2) (Item 9, Appendix B)

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

Sealing Compound (Item 62, Appendix B)

Outriggers down with weight off vehicle

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

Wire, Nonelectrical (Item 79, Appendix B)

Packing, Preformed (4) (Item 357, Appendix E)

START

KNOWN INFO

TEST OPTIONS

WARNING

Read WARNING

Unit Troubleshooting

Pressure test.

on Page 2-709

tasks completed.

Hoist lowers.

REASON FOR QUESTION

Boom telescopes in.

Is accumulator pressure

Crane swings.

Low accumulator pressure

190 to 210 psi (1,310 to

can cause the boom to

POSSIBLE PROBLEMS

1,448 kPa)?

bounce, allowing the OSS

to activate prematurely.

Accumulator not charged.

OSS box out of calibration.

OSS box faulty.

Tension load cell faulty.

Harness faulty.

Wire faulty.

Recharge

accumulator. Verify

repair, go to Step 6 of

this Fault.

YES

2-708