TROUBLESHOOTING GUIDE
3203 SERIES
8-3.0.0
5/22/2003
A. Select inoperable function with
pendant switch and push manual override
of valve in question-if function works use
procedure 1.C. to check receptacle and
pendant. If receptacle checks out and
function can not be run by using jumper at
receptacle, then valve or harness may be
bad. Check for 12 volt at valve junction
box. If no voltage present-check for loose
wire at back of receptacle or terminal strip.
b. If voltage is present at valve, then
valve may be bad. This can be checked by
swapping valve positions on manifold but
leaving wiring attached. If trouble moves
with valve, then valve is bad.
c. If boom retract or boom down
functions don't work, then check for low
hydraulic pressure at pump. These two
functions have the highest pressure
requirements for an unloaded crane
because they must overcome the set
pressures of the counter balance valves.
d. If hydraulic functions are more
intermittent when cylinders are extended,
then check hydraulic fluid level.
e. Boom locks up and won't come
down when fully raised. This is caused by
too high pump pressure which causes
overload system to activate. Set relief
pressure at 2100 psi. Unlock boom by
disconnecting wire from terminal #6 of
timing relay. Reconnect wire after boom is
moved. If pressure is correct and problem
continues, then replace overload pressure
switch.
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