Manitowoc 2250 Service Maintenance Manual

Reference Only
Manitowoc Published 07-19-16, Control # 249-01 10-59
2250 SERVICE/MAINTENANCE MANUAL TROUBLESHOOTING
10
5. Continue to stroke the valve section after the cylinders
are fully retracted during the entire test.
6. Verify the pressure is 229 to 241 bar (3,325 to
3,500 psi).
7. If the pressure is not within range, loosen the auxiliary
system disable valve adjusting screw (4) lock nut on the
bottom of the auxiliary system disable valve.
8. Turn the adjusting screw clockwise (in) to increase
pressure until the correct pressure is obtained.
9. Turn the adjusting screw counterclockwise (out) to
decrease pressure until the correct pressure is obtained.
NOTE: If the gauge pressure does not change or changes
erratically with movement of the adjusting screw,
the auxiliary system disable valve could be
damaged. Repair or replace the auxiliary system
disable valve and recheck for even pressure.
10. If the gauge pressure changes erratically with
movement of the adjusting screw, but hydraulic pressure
remains below 229 bar (3,325 psi), turn the auxiliary
system disable valve adjusting screw all the way in.
11. At the upper valve assembly relief valve, loosen the lock
nut and turn the adjusting screw in until the gauge shows
241 bar (3,500 psi).
12. Secure the lock nut.
NOTE: If 241 bar (3,500 psi) cannot be obtained, the
accessory relief valve (6) may be damaged. Repair
or replace the relief valve and recheck for correct
pressure.
If the pressure is correct but the problem cylinder still is not
working correctly, continue pressure testing at the auxiliary
system disable valve to determine if the valve assembly or
the proportional flow control valve (1) is damaged.
If the problem cylinder is directly driven off a valve section of
the upper accessory valve, disconnect the cylinder from the
valve assembly and plug the lines. Enable the problem
cylinder valve in the retract direction and check the pressure.
If the pressure is 229 to 241 bar (3,325 to 3,500 psi), repair
or replace the cylinder. If the pressure is 229 bar (3,325 psi)
or less, repair or replace the valve assembly.
If the problem cylinder is directly driven off a valve section of
the lower accessory valve, disconnect the flow control valve
assembly and plug the lines. Enable the problem cylinder in
either direction and check the pressure. If the pressure is
229 bar (3,325 psi) or less, repair or replace the proportional
flow control valve.
CAUTION
Possible Component Damage!
The auxiliary disable valve seat may be damaged if the
adjusting screw is not tightened properly.
Do not overtighten the auxiliary system disable valve
adjusting screw in the clockwise (in) direction.

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English