BOOM DOES NOT TELESCOPE OR TELESCOPES SLOWLY.

TM 9-2320-364-34-1

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

13. BOOM DOES NOT TELESCOPE OR TELESCOPES SLOWLY.

INITIAL SETUP

Tools and Special Tools

Materials/Parts - Continued

Tool Kit, General Mechanic's

Pin, Cotter (2) (Item 417, Appendix E)

(Item 240, Appendix F)

References

Cap and Plug Set (Item 26, Appendix F)

TM 9-2320-364-10

Pan, Drain 4 gal (Item 144, Appendix F)

TM 9-2320-364-20

Pressure Test Kit (Item 165, Appendix F)

Lifting Device (Minimum Capacity

Equipment Condition

200 lbs/91 kg)

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

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

Materials/Parts

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

Oil, Hydraulic (Item 34, Appendix B)

Outriggers down with weight off

Tags, Identification (Item 72, Appendix B)

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

Lockwasher (4) (Item 282, Appendix E)

Packing, Preformed (2) (Item 337, Appendix E)

Packing, Preformed (2) (Item 347, Appendix E)

START

KNOWN INFO

TEST OPTIONS

Operation test.

Unit Troubleshooting

Does boom telescope but all

tasks completed.

sections of boom do not

Crane swings.

REASON FOR QUESTION

extend or retract completely?

If boom chain or cable is faulty,

POSSIBLE PROBLEMS

boom may extend and retract but

not completely or a section of the

Boom chain or cable faulty.

boom may not telescope while

Four valve bank faulty.

the others do.

Telescope cylinder

faulty.

Go to Step 2 of this

Fault.

YES

Go to Step 5 of this

Fault.

2-576