TM 9-2320-366-34-1
2-1042
KNOWN INFO
KNOWN INFO
YES
YES
NO
Does mast remain erect?
REASON FOR QUESTION
TEST OPTIONS
TEST OPTIONS
NO
REASON FOR QUESTION
Faulty thermal relief valve
or mast erection cylinder
will cause mast to not erect
or stow properly.
Holding Valve Check
POSSIBLE PROBLEMS
2.
Hydraulic oil level OK.
Hydraulic hoses, tubes,
and fittings OK.
Hydraulic pump OK.
Monoblock valve
assembly OK.
Control valve OK.
Holding valve OK.
POSSIBLE PROBLEMS
3.
Hydraulic oil level OK.
Hydraulic hoses, tubes,
and fittings OK.
Three stage hydraulic
pump OK.
Monoblock valve OK.
Control valve OK.
Faulty holding valve.
Faulty thermal relief valve.
Faulty erection
cylinder.
Faulty holding valve will
cause erection cylinder
to drift.
Replace erection
cylinder (para 16-38).
Is erection cylinder
leaking?
Erection Cylinder Check
Faulty thermal relief valve.
Faulty erection
cylinder.
Replace erection
cylinder (para 16-38).
Replace erection
cylinder (para 16-38).
j3. M1089 MATERIAL HANDLING CRANE (MHC) MAST DOES NOT ERECT OR STOW (CONT)
