Manitowoc 18000 - Page 308

Reference Only
TROUBLESHOOTING 18000 SERIVCE/MAINTENANCE MANUAL
10-30
Published 12-05-17, Control # 035-23
Problem 28
Jacking cylinder(s) will not extend or retract.
CHECKS
Check supercharge accessory supply system for 3,000 psi (207 bar)
while enabling selected jacking cylinder switch on remote control.
POSSIBLE CAUSES
Not in setup mode; Faulty control valve section; Low pump pressure;
Supercharge accessory supply pump is damaged; Faulty counterbalance valve.
3,000 psi (207 bar)
Low/no pressure
Is crane setup remote mode selected and confirmed?
Yes No
Exchange both counterbalance valve
cartridges on problem jacking cylinder. Is
cylinder enabled with switch movement?
Adjust supercharge accessory
supply pressure to 3,000 psi (207
bar) when enabling jacking switch.
Consult dealer/factory.
Replace counterbalance valve. (See Section 2 -
Counterbalance Valve Adjustments).
Repair or replace
jacking cylinder.
Yes No
Select and confirm setup remote mode.
Does system develop any working pressure?
Yes No
Ok Not Ok
Check supercharge accessory supply pump operation.
Repair or replace supercharge pump.