OPERATING CONTROLS AND PROCEDURES MLC300 OPERATOR MANUAL
3-70
Published 11-20-19, Control # 234-19
9. As the luffing jib nears the desired angle, slowly move
the luffing jib control handle toward off to decrease
speed.
Then, move the control handle to off to stop the luffing jib
when it reaches the desired angle. The luffing hoist
brake will apply to hold the boom in position.
NOTE Besides the automatic luffing jib stops, a physical
luffing jib stop starts to cushion luffing jib raising at
149° boom-to-luffing jib angle and provides a
physical stop at 172° boom-to-luffing jib angle.
10. To hold the luffing jib in position for long periods, turn on
the luffing jib park switch. The luffing hoist pawl will
engage.
Swing Operation
1. If not already done, perform the crane Startup
Procedure on page 3-63
.
2. Select the correct capacity chart and crane configuration
using the RCL/RCI Display. For detailed instructions,
see the RCL/RCI Operation Manual.
3. Swing speed and torque can be adjusted between 25%
and 100% to meet operator needs. See the Speed and
Limits Screen topic in the Main Display Operation
Manual for detailed instructions.
4. The swing angle can be adjusted between 0° and 100°
to meet job site restrictions. See the Swing Angle
Screen topic in the Main Display Operation Manual for
detailed instructions.
5. Turn off the swing park switch.
6. Increase the engine speed to the desired RPM with the
hand throttle. Press the foot throttle to momentarily
increase the engine speed when more power is
required.
7. Move the swing control handle to the LEFT from off to
SWING LEFT.
Move the swing control handle to the RIGHT from off to
SWING RIGHT.
8. Start the swing motion with a smooth acceleration.
Continue control handle motion to swing at the desired
speed.
9. Stop swinging by releasing the swing control handle to
OFF. Swing speed will decrease to off and the rotating
bed will coast to a stop.
If a faster stop is desired, move the swing control handle
past OFF to the opposite swing direction.
10. Once the rotating bed stops, depress the button on the
control handle to apply the swing holding brake and hold
the rotating bed in position for short periods during the
operating cycle.
11. To hold the rotating bed in position for long periods, turn
on the swing park switch.
WARNING
Tipping Hazard
To prevent the crane from tipping, adhere to any swing
limitations given in the capacity chart.
DANGER
Moving Crane Hazard
The counterweights can strike personnel in the area of the
swing path! Warn personnel to stay clear of the swing
path. Sound the horn prior to swinging.
Figure 3-20. Swing Control Handle
CAUTION
Avoid Boom/Swing Drive Damage
Do not apply the swing holding brake or turn on the swing
park switch while swinging. The brake will bring the
rotating bed to an abrupt stop. This action could cause
damage to the boom and the luffing jib from side loading
or damage to the swing drive from shock loading. Bring
the rotating bed to a smooth stop with the swing control
handle and then apply the swing holding brake or turn on
the swing park switch.
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