TM 9-2320-366-34-1
2-990
START
1.
YES
Is flow or pressure low
from stiffleg control
valve?
h2. M1089 LEFT STIFFLEG DRIFTS OR DOES NOT WORK
WARNING
Read WARNING
and CAUTION
on following page.
WARNING
Repair or replace left stiffleg
cylinder (para 16-68).
Repair or replace upper main valve
assembly (para 16-83).
INITIAL SETUP
Equipment Conditions
Engine shut down (TM 9-2320-366-10-1).
Personnel Required
(2)
Tools and Special Tools
Tool Kit, Genl Mech (Item 78, Appendix B)
Tester, Hydraulic (Item 73, Appendix B)
Goggles, Industrial (Item 28, Appendix B)
Pan, Drain (Item 43, Appendix B)
KNOWN INFO
Hydraulic pump OK.
PTO OK.
Hydraulic oil level OK.
Hydraulic hoses, tubes,
and fittings OK.
Left 30K winch
assembly OK.
15K self-recovery
winch OK.
POSSIBLE PROBLEMS
Faulty upper main valve
assembly.
Faulty stiffleg cylinder.
TEST OPTIONS
Upper Main Valve
Assembly
Pressure/Flow Test
REASON FOR QUESTION
If pressure and flow are
low, left stiffleg will not
work properly.
NO
Materials/Parts
Rag, Wiping (Item 60, Appendix C)
Hose (2) (Item 40, Appendix C)
Fitting (2) (Item 31, Appendix C)
Reducer, Tube (Item 61, Appendix C)
Adapter, Pipe (Item 2, Appendix C)
Adapter, Swivel (Item 3, Appendix C)
