Manitowoc 2250 Service Maintenance Manual

Reference Only
TROUBLESHOOTING 2250 SERVICE/MAINTENANCE MANUAL
10-28
Published 07-19-16, Control # 249-01
POSSIBLE CAUSES
Faulty relief valve, auxiliary disable valve, proportional control valve, or
control valve section. Cylinder failure. Pump is bad.
PROBLEM 26
Boom handling cylinders will not extend or retract.
CHECKS
Check for 12 volts at auxiliary disable valve when enabling cylinders.
No Volts12 Volts
Check for 241 bar (3,500 psi) at auxiliary system disable valve while
enabling any upper valve assembly control in retract direction. (See Tes t
24—Checking and Adjusting the Auxiliary System Working Pressure.)
241 bar (3,500 psi) or More
241 bar (3,500 psi) or Less
Check diagnostic display screen (bank 3) for
change of 4 when enabling cylinders.
Check disable
valve wiring.
Consult dealer /
factory.
Change
No Change
241 bar (3,500 psi) or Less
241 bar (3,500 psi) or More
241 bar (3,500 psi) or Less
Check for 241 bar (3,500 psi) at auxiliary system disable
valve while enabling any other adapter frame valve
section in retract direction.
Adjust auxiliary system disable valve and check pressure.
(See Test 24—Checking and Adjusting the Auxiliary System
Working Pressure.)
Replace auxiliary system disable valve.
Enable boom handling cylinder extend and retract solenoid valves
and check that voltage is present.
Voltage
No Voltage
Disconnect adapter frame valve assembly from proportional
flow control valve and plug valves. Check pressure at
auxiliary system disable valve.
241 bar (3,500 psi) or Less
241 bar (3,500 psi) or More
Repair or replace proportional
flow control valve.
Repair or replace adapter
frame control valve.
Check for 12 volts at boom handling cylinder switch wire #55.
Voltage
No Voltage
Replace appropriate diode to wire #89D1.
Replace appropriate switch.
Replace counterbalance valve.
Repair or replace cylinder.
Yes
No
Exchange boom handling counterbalance
valve cartridges. Does problem cylinder
operate when enabled/
Repair or replace valve section.
241 bar (3,500 psi)
or More
241 bar (3,500 psi)
or Less
Check for 241 bar (3,500 psi) at auxiliary system disable
valve while enabling boom handling cylinder control in
retract direction. (See Test 24—Checking and Adjusting
the Auxiliary System Working Pressure.)

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English