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Page Title:
BOOM EXTEND CYLINDER SLOW OR DOES NOT EXTEND OR RETRACT - continued |
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 TM 10-3930-673-20-1
6. BOOM EXTEND CYLINDER SLOW OR DOES NOT EXTEND OR RETRACT (CONT).
2
KNOWN INFO
TEST OPTIONS
Hydraulic oil OK.
Visual inspection.
Are hydraulic hoses leading
STE/ICE-R #51.
POSSIBLE PROBLEMS
to boom extend cylinder free
REASON FOR QUESTION
Extend cylinder hydraulic hoses
of cracked, kinked, or pinched
faulty.
If any hoses are cracked, kinked,
sections?
Extend cylinder hose connections
or pinched, extend cylinder will
faulty.
not function.
Tandem gear pump faulty.
Main control valve faulty.
Hydraulic joystick control valve
faulty.
Extend cylinder faulty.
Replace faulty
NO
hoses
(Para 18-25).
YES
3
KNOWN INFO
TEST OPTIONS
Hydraulic oil OK.
Visual inspection.
Are hydraulic hose
Extend cylinder hydraulic hoses
STE/ICE-R #51.
connections leading to boom
OK.
REASON FOR QUESTION
extend cylinder tight and free
POSSIBLE PROBLEMS
If hydraulic hose connections show
of leaks?
Extend cylinder hose connections
signs of leaks, hydraulic system
faulty.
will lose pressure.
Tandem gear pump faulty.
Main control valve faulty.
Hydraulic joystick control valve
faulty.
Extend cylinder faulty.
Tighten or replace
NO
faulty fittings
(Para 18-25).
YES
2-816
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