Manitowoc 2250 Service And Maintenance Manual

Reference Only
Manitowoc Published 11-06-15, Control # 040-13 10-27
2250 SERVICE/MAINTENANCE MANUAL TROUBLESHOOTING
10
PROBLEM 25
Jacking cylinder(s) will not extend or retract.
CHECKS
Check for 12 volts at auxiliary disable valve when enabling cylinders.
POSSIBLE CAUSES
Faulty relief valve; Faulty control valve section;
Faulty enable valve; Bad pump; Faulty cylinder.
12 Volts
No Volts
Check for 3,500 psi at auxiliary system disable valve while enabling
another jacking cylinder on lower accessory valve.
3,500 psi or more
3,500 psi or less
Check diagnostic display screen (bank 3) for
change of 4 when enabling cylinders.
Change
No Change
Check disable valve wiring.
Consult dealer/factory.
3,500 psi or more
3,500 psi or less
Check for 3,500 psi at auxiliary system disable
valve while enabling problem jacking cylinder.
Yes
No
Exchange both counterbalance valve cartridges
on problem jacking cylinder.
Is cylinder enabled with handle movement?
Adjust upper accessory relief valve for
3,500 psi and check pressure. (See Te st
25.)
3,500 psi or less
Repair or replace upper accessory relief valve.
Repair or
replace
cylinder.
Enable jacking extend and retract solenoid valves and check that voltage is present.
Voltage
No Voltage
Voltage
No Voltage
Replace counterbalance
valve.
Adjust upper accessory relief valve for 3,500 psi
and check pressure. (See Te s t
25.)
Repair or replace upper accessory relief
valve or valve section.
Replace problem diode
to wire #89D1.
Replace switch.
Check for 12 volts at jacking cylinder switch wire #54.

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English