OPERATING CONTROLS AND PROCEDURES MLC300 OPERATOR MANUAL
3-24
Published 11-20-19, Control # 234-19
28 Drum Control Handles
Each load drum has a spring-applied, hydraulically-released, disc-type drum
brake on the motor end of the drum.
Additionally, if the front or rear drum has free fall, a spring-applied, hydraulically-
released disc-type brake is provided on the left end of the drum.
For normal operation (free fall off or without free fall):
• If equipped, the free fall brake (on left end of drum) is applied at all times.
• The corresponding drum brake is released automatically when the drum
control handle is moved in either direction from off.
• The corresponding drum brake is applied automatically when the drum
control handle is moved to off.
• For non-free fall load drums, see Load Drum Operation
(without free fall or
with free fall disabled) on page 3-73.
For free fall operation:
Free fall cannot be turned on when the crane is configured for VPC-MAX.
• The drum brake (on motor end of drum) is applied when the drum control
handle is in neutral and when the load is free falling. If the handle is not in
neutral, the free fall brake is applied proportionally to the handle.
• Once the load stops free falling, the drum brake releases. If the handle is
returned to neutral and the free fall pedal is not down, the drum brake is
applied and the free fall brake releases proportionally to the pedal.
• Use the free fall brake pedal to control lowering speed and to stop and
hold the load in position.
• For free fall load drums, see Load Drum Operation
(with free fall enabled) on
page 3-75.
NOTE The drum brakes are applied automatically when the engine is stopped
(or power is lost for any reason), when applicable operating limits are
reached, when applicable system faults occur, and when the drum park
switches are moved to the park position.
The position of the drum control handles can vary depending on crane
configuration. See Drum and Control Handle Identification on page 3-54
.
The following description is for normal operation (free fall off). If free fall is on,
the corresponding free fall brake pedal must be applied to stop the load
when the drum control handle is released to off.
• Pull the control handle BACK to RAISE the load. The drum brake releases
and speed increases in relation to control handle movement.
• Release the control handle to CENTER to STOP the load. Speed decreases
to off and the drum brake applies to stop and hold the drum in position.
• Push the control handle FORWARD to LOWER the load. The drum brake
releases and speed increases in relation to control handle movement.
NOTE Drums 1 and 3 cannot be operated at the same time. If you attempt to
operate both drums at the same time, the Function Diverted fault will
come on in the Main Display. Park the drum not in use.
Table 3-6. Right Console
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