TM 9-4910-609-14&P
TROUBLESHOOTING
4.1
Shop air applies pressure through the 3-way selector valve, pushes
the hydraulic oil in reservoir into cylinder, which forces the cylinder
DOWN position,
When the 3-way selector valve is in the
to move up.
the weight of the assemblies will produce a downward movement.
All other tasks are manual.
This is the basic principle for operation.
Due to this simplicity, a number of malfunctions are reduced to only
the following:
REMEDY
PROBABLE
CAUSE
TROUBLE
Check air pressure
Insufficient
pressure
Cylinder not
moving up
3-way valve orifice clogged
Remove valve, clean or
replace.
Replace seals
Seal in cylinder head damaged
Clean valve or replace
3-way valve orifice clogged
Cylinder not
moving down
Disassemble, clean,
Rotating shaft (Item 4-l),
Will not rotate
deburr
binding
vertically
Disassemble, clean,
Interface of holding assembly
Will not rotate
deburr
& overhand arm binding
horizontally
