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.
32trbl 2/99
TROUBLESHOOTING GUIDE
3203 PRX
6-8.2.0
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