Manitowoc 2250 Service Maintenance Manual

Reference Only
Manitowoc Published 07-19-16, Control # 249-01 2-23
2250 SERVICE/MAINTENANCE MANUAL HYDRAULIC AND AIR SYSTEMS
2
Rotating Bed Jacking Cylinders
See Figure 2-26 for the following procedure.
1. Stop the engine.
2. The jacking cylinders (2) will be extended during this
procedure.
a. Rotate the jacking cylinders away from the rotating
bed so they cannot contact anything.
b. Warn all personnel to stand clear of the cylinders.
3. Connect an accurate 0 to 413 bar (0 to 6,000 psi)
hydraulic pressure gauge to the gauge coupler (7) on
the auxiliary system relief valve (8).
4. Start and run the engine at 1,500 rpm.
5. Fully extend one jacking cylinder until it bottoms out
(stall the hydraulic system). The gauge pressure should
be 152 to 158 bar (2,200 to 2,300 psi).
6. Repeat step 4
and step 5 for each jacking cylinder, one
at a time.
7. If the specified pressure is not indicated for any cylinder,
determine the cause and correct it.
8. Fully retract and store cylinders when done.
9. Stop the engine and remove the gauge from the coupler
on the auxiliary system relief valve. Install a protective
cap over the coupler.
Connecting Pin Cylinders (Crawler, Boom Hinge, and
Adapter Frame)
1. Start and run the engine at 1,500 rpm.
2. Fully extend and retract all connecting pin cylinders.
Make sure of the following:
• The cylinders operate in the proper directions with
relation to the controls.
• All cylinders fully extend and retract smoothly
without resistance.
3. If any cylinder does not operate properly, determine the
cause and correct it.
Boom Butt Handling Cylinder
See Figure 2-26 for the following procedure.
Perform the following procedure with the boom butt
connected to the crane and cylinder.
1. Start and run the engine at 1,500 rpm.
2. Fully retract the cylinder until it bottoms out, and proceed
as follows.
a. Crack open the bleed screw (4) on the proportional
flow control valve (3).
b. Securely close the bleed screw when a steady
stream of clear oil appears.
3. Set the speed control on the setup remote control to
FAST.
4. Fully retract and then fully extend the boom butt
handling cylinder. The extension time should be
approximately 60 seconds. If not, determine the cause
and correct it.
5. Once fully extended, the cylinder must hold the boom
butt in position without retracting.
6. If the cylinder does not hold, determine the cause and
correct it.
7. The cylinder must extend and retract smoothly. If not,
determine the cause and correct it.
Gantry Cylinders
See Figure 2-27 for the following procedure.
Perform step 1
and step 2 with the gantry removed.
1. Start and run the engine at 1,500 rpm.
2. Extend the gantry cylinders. Both cylinders should
extend at the same speed. If they do, go to step 4
. If they
do not, proceed as follows.
a. At the faster cylinder, loosen the lock nut and turn
the rod end counterbalance valve adjusting screw
out in small increments until both cylinders extend at
the same speed.
b. Securely tighten the lock nut.
3. Install the gantry and perform the remaining steps.
4. Fully retract the cylinders and attach the counterweights
(Series 1 minimum).
5. Extend the cylinders to raise the counterweights
approximately 0,3 m (1 ft) off the ground and stop.
6. The cylinders must hold the counterweights in position.
If they do, go to step 7
. If they do not, proceed as
follows.
a. Lower the counterweights to the ground (retract the
cylinders).
b. At the piston end counterbalance valve, in both
cylinders, loosen the lock nut and turn the adjusting
screw out 1/2 turn.
c. Repeat step 5
through step 6b until the cylinders
hold the counterweight in position.
d. Securely tighten the lock nuts.

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English