Manitowoc Published 06-24-16, Control # 241-01 3-39
2250 OPERATOR MANUAL OPERATING CONTROLS AND PROCEDURES
Then, fully apply the drum working brake with the
pedal to stop the load and hold it in position.
8. If the load will be suspended for any length of time, press
down and latch the brake pedal in the APPLIED position,
turn on the drum park to apply the drum brake, and
engage the drum pawl (if equipped) for each load drum.
Clamshell Operation—Standard
See Figure 3-9 for identification of handle motions in
Clamshell mode. See E4—Crane Mode Selector on page 3-
20 for clam closing control mode operation.
Selecting Clamshell Mode
1. If equipped with three drums, switch the drum selector to
the drum 2 position.
2. Select and confirm Free Fall mode for both drums.
3. Select and confirm Clamshell mode.
4. Clam closing pressure is set with the clam closing
control at the rear of the right side console in the
operator’s cab.
NOTE: The clam closing pressure remains in computer
memory even after the engine is stopped.
5. Turn off the drum park switch to release the drum brake,
and disengage the drum pawl (if equipped) for each load
drum.
NOTE: The bucket will not lower until the drum pawls are
disengaged. It may be necessary to hoist the
bucket slightly before the pawls will disengage.
The load drums will stop if either pawl is engaged
while lowering the bucket.
6. Set engine speed at the desired rpm.
Closing Bucket (Digging)
1. Lower an open bucket into the digging area.
2. Fully release the closing and holding line brakes and pull
back the closing line handle to close the bucket.
3. Use the holding line brake to control the digging depth.
Use more brake to dig shallower and less brake to dig
deeper.
4. Fully apply the closing and holding line brakes and
release the closing line handle to OFF when the bucket
is closed.
NOTE: Watch the closing line when digging in a blind area.
The bucket is closed when the closing line stops
moving.
Hoisting Bucket
1. Pull the holding line handle back and fully release the
holding and closing line brakes to hoist the bucket.
2. Swing to the dumping area as the bucket is hoisted.
3. Fully apply the closing and holding line brakes and
release the holding line handle to OFF when the bucket
is hoisted to the desired height.
4. Stop swinging when the bucket is over the dumping
area.
Dumping Bucket
NOTE: The bucket can be powered open by moving the
closing line handle forward. This is a very slow
process, however. To open (dump) the bucket fast,
release the closing line brake.
1. Release the closing line brake to dump the bucket (keep
the holding line brake applied).
2. Use care not to slacken the closing line while dumping.
Any slack in the closing line will need to be taken out
while digging. This action will slow down the clam cycle.
3. Fully apply the closing line brake once the bucket is
empty.
Lowering Bucket
1. Push the holding line handle forward and release the
closing and holding line brakes to lower the bucket.
2. Control the lowering speed by slowly moving the holding
line handle toward OFF.
NOTE: The lowering speed is controlled by handle
movement. It should not be necessary to apply the
brakes to slow down the bucket. If desired, the
holding line brake can be applied to slow down the
bucket.
CAUTION
Avoid Clutch or Motor Damage!
Do not move the drum handle in either direction from OFF
while free falling a load. Serious damage to the drum
clutch and motor could result. Stop the load with the drum
working brake and then move the drum handle in the
desired direction.
For the same reason, do not turn off Free Fall or turn on
the drum park while free falling a load. Stop the load with
the drum brake and then turn off Free Fall or turn on the
drum park.
CAUTION
Drum Clutch Damage!
The drum clutch can be damaged. Do not apply the
closing line brake to slow down the bucket lowering
speed.
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