Manitowoc Published 06-24-16, Control # 241-01 3-77
2250 OPERATOR MANUAL OPERATING CONTROLS AND PROCEDURES
Swing Limit Switch Adjustment
See Figure 3-62 for the following procedure.
The physical limits defined by the position of the limit switch
actuators cannot be bypassed. If either actuator is contacted,
the swing pump shifts to neutral and the swing brake applies.
1. At initial setup only, adjust the limit switch lever so the
roller is in full contact with the actuator ramp (see View
B).
2. Remove both limit switch actuators from the actuator
rail.
3. Program the swing limits. See Programming Swing
Limits on page 3-74.
4. Swing the rotating bed in either direction to the
programmed right or left swing limit.
5. Engage the swing lock.
6. Place the actuator on the rail (see View B)—to the right
of the limit switch for the swing right limit or to the left of
the limit switch for the swing left limit—so the actuator
just lightly contacts the limit switch roller. Do not trip the
limit switch open while performing this step.
7. Securely tighten the setscrews to secure the actuator.
8. Swing the rotating bed to the programmed swing limit in
the opposite direction and repeat step 3
through step 7.
NOTE: The operator can swing away from either actuator
by moving the swing handle in the opposite
direction and building a pressure in that direction. If
the pump control is stuck in the wrong direction,
pressure will not build up in the safe direction and
the brake will never release.
If for any reason the crane swings in the wrong
direction after the brake has been released (due to
crane being out of level or excessive side wind) the
brake will reapply. The operator is free to attempt to
swing away from the actuator again or stop and
investigate. After several attempts, it is possible to
ratchet well beyond the limit.
If the operator is unable to swing away from the
actuators in two to three attempts, stop and move
the crane away from any dangerous areas before
trying to swing again.
SWING DRIVE DISCONNECT OPERATION
General
The crane has either one or two swing drives. Disconnecting
the swing drives may be necessary to prevent equipment
damage in high wind conditions by allowing the boom to
weather vane. Before disconnecting the swing drives,
perform the following steps.
1. Swing the crane so that the rear faces the wind direction.
2. Compare expected wind velocities to the wind limits
indicated in Wind Conditions on page 3-82
.
3. Lower the boom to the angle indicated or to the ground
as required to prevent equipment damage.
4. Make sure there is sufficient clearance for the boom to
swing without striking other objects.
CAUTION
Equipment Damage!
To prevent equipment damage, sufficient clear area must
be available for the crane to weather vane.
Before disconnecting the swing drives, make sure the
boom will not strike power lines, buildings, or other
stationary objects while the crane is weather vaning.
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