Manitowoc Published 11-06-15, Control # 040-13 2-23
2250 SERVICE/MAINTENANCE MANUAL HYDRAULIC AND AIR SYSTEMS
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.
Check that:
a. Cylinders operate in proper directions with relation
to controls.
b. All cylinders fully extend and retract smoothly
without resistance.
3. If any cylinder does not operate properly, determine
cause and correct.
Boom Butt Handling Cylinder
Perform the following procedure with boom butt connected to
crane and cylinder.
1. Start and run the engine at 1,500 RPM.
2. Fully retract cylinder until it bottoms out, and proceed as
follows:
a. Crack open bleed screw on proportional flow control
valve (Figure 2-26
, View C).
b. Securely close bleed screw when a steady stream
of clear oil appears.
3. Set speed control on setup remote control to fast.
4. Fully retract and then fully extend boom butt handling
cylinder. Extension time should be approximately 60
seconds. If not, determine cause and correct.
5. Once fully extended, cylinder must hold boom butt in
position without retracting.
6. If cylinder does not hold, determine cause and correct.
7. Cylinder must extend and retract smoothly. If not,
determine cause and correct.
Gantry Cylinders
See Figure 2-27 for the following procedure.
Perform steps 1
and 2 with gantry removed.
1. Start and run engine at 1,500 RPM.
2. Extend gantry cylinders. Both cylinders should extend at
same speed. If they do, go to step 4
. If they do not,
proceed as follows:
a. At faster cylinder, loosen lock nut and turn rod end
counterbalance valve adjusting screw out in small
increments until both cylinders extend at same
speed.
b. Securely tighten lock nut.
3. Perform the remaining steps with gantry installed.
4. Fully retract cylinders and attach counterweights (Series
1 at least).
5. Extend cylinders to raise counterweights approximately
1 ft (0,3 m) off ground and stop.
6. Cylinders must hold counterweights in position. If they
do, go to step 7
. If they do not, proceed as follows:
a. Lower counterweights to ground (retract cylinders).
b. At piston end counterbalance valve in both
cylinders, loosen lock nut and turn adjusting screw
out 1/2 turn.
c. Repeat steps 5
through 6b until cylinders hold
counterweight in position.
d. Securely tighten lock nuts.
FIGURE 2-27
ROD END Counterbalance Valve
(with lock nut and adjusting screw)
View A
Gantry Cylinder
Right Rear Corner of Rotating Bed
P977
View B
Gantry Cylinder
Left Rear Corner of Rotating Bed
P976
PISTON END
Counterbalance Valve
(with lock nut and
adjusting screw)
On Inboard Side
ROD END Counterbalance Valve
(with lock nut and adjusting screw)
On Inboard Side
PISTON END
Counterbalance Valve
(with lock nut and adjusting screw)
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