PROBLEM 24
Gantry cylinders will not raise or lower.
CHECKS
Does system pressurize to 3,500 psi (241 bar) when moving gantry switch
from neutral to lower position at remote controller?
POSSIBLE CAUSES
Setup chart is not selected; Faulty control valve section; Low pump pressure;
Bad pump; Switch failure; Faulty counterbalance valve.
Yes No
Are mechanical problems present at
gantry cylinders?
Yes No
When moving gantry switch, does accessory system pressure
increase?
Check for 24 volts at gantry power switch.
(See Section 3 for gantry switch pin numbers).
Voltage
No Voltage
Repair
problem.
Adjust cylinder counterbalance valve.
Does cylinder operate correctly?
No
Replace cylinder or consult dealer/factory.
Are solenoids magnetized when switch position are enabled?
Check front drum system pressure with handle in neutral.
Pressure Ok
Pressure not Ok
Repair or replace control valve.
Repair or replace system pump, if necessary.
Replace power switch.
Yes No
Is setup chart selected on RCL display?
Yes No
Consult dealer/factory.
Select setup chart.
Yes
No
Replace solenoid valve.
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