PROBLEM 27
Carbody jacking cylinder(s) will not extend or retract.
CHECKS
Check for 3,100 psi (214 bar) at valve test port while enabling carbody jacking cylinder.
POSSIBLE CAUSES
Faulty control valve section; low pump pressure; bad pump; pressure
transducer bad; faulty counterbalance valve.
Check for 3,100 psi (214 bar) at system test
port while enabling another jacking cylinder.
3,100 psi (214 bar) or More
Less than 3,100 psi (214 bar)
Yes No
Exchange both counterbalance valve
cartridges on problem jacking cylinder. Is
cylinder enabled with handle movement?
3,100 psi (214 bar) or More
Replace counterbalance valve.
Repair or replace jacking cylinder.
Repair or replace drum 1
(front drum) pump.
Does system pressure increase when a jacking
cylinder handle is moved?
Yes No
Repair or replace lower accessory
pressure sender.
Consult dealer/factory.
Does system develop any pressure?
Yes No
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