Ashland 1200 TR - Manual (Page 35)

35
TROUBLE SHOOTING YOUR HYDRAULIC SYSTEM
PROBLEM POSSIBLE CAUSES REMEDY
Solenoid valve problem Solenoid burned out Replace solenoid coil. Check
control voltage (High or low
voltage will burn out oil)
For double solenoid valves,
check to see if both solenoids
are being energized at the
same time. Correct control
circuit if this occurs.
No pilot pressure for shifting If valve is externally piloted,
main spool check pilot pressure source for
adequate pressure.
No pilot pressure for shifting Check valve for proper internal
main spool (continued) plugs for ext. pilot.
If valve is internally piloted,
check for proper internal plugs
for internal pilot.
Clear all internal pilot
passages and orifices of
foreign particles and clogging.
No pilot drain Check to see if valve has
proper internal plugs and
orifices for inter. or ext. drain.
If externally drained, check
drain line and clear of any
clogging.
Spool jammed by foreign Disassemble pilot valve and
particles or silt main valve and remove all
foreign particles and silt. If a
contamination or silting
problem continues to reoccur,
install filtration in the system to
remove particles.
Internal breakage or damage Disassemble, examine and
replace any damaged parts in
pilot valve or main valve.