Manitowoc 2250 Service Maintenance Manual

Reference Only
Manitowoc Published 07-19-16, Control # 249-01 10-27
2250 SERVICE/MAINTENANCE MANUAL TROUBLESHOOTING
10
CHECKS
Check for 12 volts at auxiliary disable valve when enabling cylinders.
PROBLEM 25
Boom hinge pin or crawler pin cylinders will not operate.
POSSIBLE CAUSES
Faulty relief valve, auxiliary disable valve, proportional control valve, or control
valve section. Cylinder failure. Bad pump. Mechanical problem.
12 Volts
No Volts
Check for 241 bar (3,500 psi) at upper valve assembly while enabling any
upper valve assembly control in retract direction. (See Test 24—Checking
and Adjusting the Auxiliary System Working Pressure.)
241 bar (3,500 psi) or More
241 bar (3,500 psi) or Less
241 bar (3,500 psi) or More
Check for mechanical problem at pin cylinders.
No Problem
Repair as necessary.
Check diagnostic display screen (bank 3) for
change of 4 when enabling cylinders.
Change
No Change
Check disable valve wiring.
Consult dealer/factory.
Adjust auxiliary system disable valve and check pressure. (See Tes t
24—Checking and Adjusting the Auxiliary System Working Pressure.)
241 bar (3,500 psi) or Less
Replace auxiliary system disable valve.
Enable cylinder extend and retract solenoid valves at adapter frame
valve assembly and check that voltage is present.
Voltage
No Voltage
241 Bar (3,500 Psi) Or More
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.
(See Test 24—Checking and Adjusting the Auxiliary System Working
Pressure.)
Test cylinder for
leakage (See Tes t
25—Checking Pin
Cylinder Seals.)
Disconnect and plug hoses to problem cylinder
and check pressure.
Replace valve
section.
Disconnect adapter frame valve assembly from proportional
flow control valve and plug valves. Check pressure at
auxiliary system disable valve while enabling any other
adapter frame valve section component.
241 bar (3,500 psi) or More
241 bar (3,500 psi) or Less
Repair or replace proportional
flow control valve.
Repair or replace adapter
frame control valve.
Replace appropriate diode
to wire #89D1.
Check for 12 volts at respective cylinder switch
wire #51 or #52.
Voltage
No Voltage
Replace respective switch.

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English