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 TM 9-2320-364-34-1
2-15. MATERIAL HANDLING CRANE TROUBLESHOOTING (CONT).
7. MAST DOES NOT LOWER.
INITIAL SETUP
References
Tools and Special Tools
TM 9-2320-364-10
Tool Kit, General Mechanic's
TM 9-2320-364-20
(Item 240, Appendix F)
Cap and Plug Set (Item 26, Appendix F)
Equipment Condition
Pan, Drain 4 gal (Item 144, Appendix F)
Engine OFF, (TM 9-2320-364-10)
Pressure Test Kit (Item 165, Appendix F)
Parking brake applied, (TM 9-2320-364-10)
Wheels chocked, (TM 9-2320-364-10)
Materials/Parts
Outriggers down with weight off
Oil, Hydraulic (Item 34, Appendix B)
vehicle suspension, (TM 9-2320-364-10)
Tags, Identification (Item 72, Appendix B)
Packing, Preformed (5) (Item 337, Appendix E)
Packing, Preformed (2) (Item 389, Appendix E)
START
1.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Unit Troubleshooting
Flow/pressure test.
on Page 2-509
tasks completed.
Are at
Mast raises.
REASON FOR QUESTION
least 6 gpm
If MAST valve on three valve
POSSIBLE PROBLEMS
(23 lpm) or more measured
bank is faulty, flow to erection
from MAST valve with valve
cylinder will be restricted.
Three valve bank faulty.
isolated from cylinder and
Erection cylinder faulty.
MAST control lever in DOWN
position?
Repair three valve
bank (Para 16-27).
NO
Verify repair, go to
Step 3 of this Fault.
YES
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