Manitowoc 2250 Service And Maintenance Manual

Reference Only
Manitowoc Published 11-06-15, Control # 040-13 10-61
2250 SERVICE/MAINTENANCE MANUAL TROUBLESHOOTING
10
• Continue to stroke the valve section after the cylinders
are fully retracted during the entire test.
• Check that pressure is 3,325 to 3,500 psi (229 to 241
bar).
• If pressure is not within range, loosen the adjusting
screw lock nut on the bottom of the auxiliary system
disable valve.
• Turn adjusting screw clockwise (in) to increase pressure
until correct pressure is obtained.
• Turn adjusting screw counter-clockwise (out) to
decrease pressure until 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.
If the gauge pressure changes erratically with movement of
the adjusting screw, but hydraulic pressure remains below
3,325 psi (229 bar), turn the auxiliary system disable valve
adjusting screw all the way in. At the upper valve assembly
relief valve, loosen the lock nut and turn the adjusting screw
in until gauge shows 3,500 psi (241 bar). Secure the lock nut.
NOTE: If 3,500 psi (241 bar) cannot be obtained, the upper
accessory relief valve may be damaged. Repair or
replace the relief valve and recheck for correct
pressure.
If pressure is correct but problem cylinder still is not working
correctly, continue pressure testing at the auxiliary system
disable valve to determine if the valve assembly or
proportional flow control valve 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 retract direction and check pressure. If
pressure is 3,325 to 3,500 psi (229 to 241 bar), repair or
replace the cylinder. If the pressure is 3,325 psi (229 bar) 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 pressure. If the pressure is 3,325
psi (229 bar) or less, repair or replace the proportional flow
control valve.
CAUTION
Possible Component Damage!
Do not over-tighten the auxiliary system disable valve
adjusting screw in the clockwise (in) direction. The valve
seat may be damaged.

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English