Manitowoc 2250 Service Maintenance Manual

Reference Only
Manitowoc Published 07-19-16, Control # 249-01 10-25
2250 SERVICE/MAINTENANCE MANUAL TROUBLESHOOTING
10
PROBLEM 23
Frame connecting pin cylinders will not extend or retract.
POSSIBLE CAUSES
Faulty relief valve. Faulty auxiliary system disable valve. Faulty proportional flow control valve.
Cylinder failure. Faulty control valve section. Mechanical problem.
CHECKS
Check for 12 volts at auxiliary disable valve when enabling cylinders.
12 Volts No Volts
Check for 241 bar (3,500 psi) at upper accessory valve while
enabling any upper accessory valve. (See Test 15—
Checking System Voltage at the Hydraulic Valve
Assemblies.)
241 bar (3,500 psi) or More
241 bar (3,500 psi) or Less
Adjust auxiliary system disable valve and
check pressure. (See Test 25—Checking
Pin Cylinder Seals.)
Check Diagnostic display screen (bank 3) for
change of 4 when enabling cylinders.
Change No Change
Check disable valve wiring.
Consult dealer/factory.
Enable problem frame connecting pin cylinder solenoid
valve and check if voltage is present.
Voltage
No Voltage
Check for 12 volts at connecting pins switch wire #53.
Voltage
No Voltage
Problem
No Problem
Check for mechanical problem at
frame connecting pin cylinder.
Replace diode wire to #89D1.
Replace function switch.
Disconnect and plug hoses to problem cylinder and enable valve.
Replace control valve section.
Test cylinder for leakage. (See Test 25—
Checking Pin Cylinder Seals.)
No Leakage Leakage
Replace cylinder.
Replace cylinder seal.
Repair or replace
cylinder as required.
214 bar (3,100 psi) or More
214 bar (3,100 psi) or Less

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English