Manitowoc MLC165-1 User Manual

Manitowoc Published 08-06-19, Control # 237-09_v1 3-39
MLC165-1 OPERATOR MANUAL OPERATING CONTROLS AND PROCEDURES
3
Boom Hoist (Drum 4) Operation
NOTE The following is only a very basic description of
boom hoist operation. All operators must be fully
qualified and experienced before operating the
crane.
When the crane is equipped with a luffing jib, the
boom hoist may be operated with drum handle 3/4
on the right console. See Handle-to-Drum
Identification on page 3-25.
1. If not already done, select the proper crane configuration
and capacity chart in the RCL/RCI display. For more
information, see the MLC165-1 RCL/RCI Manual.
2. Turn off the Drum 4 park switch. The Drum 4 pawl will
disengage from the drum when the park switch is moved
to off.
3. Increase engine speed to the desired rpm with the hand
throttle. Press the foot throttle to momentarily increase
engine speed when more power is required.
4. Push the boom hoist handle forward to lower the boom
or pull the handle back to raise the boom (see
Figure 3-9
.
5. As the boom nears the desired angle, slowly move the
handle toward the center position to decrease speed.
Then move the handle to the center position to stop the
boom. The boom hoist brake will apply.
NOTE Reminder: the crane has an automatic boom stop
that stops the boom when it is raised to a preset
angle (see Boom Max Up Limit on page 3-31
).
The crane also has a physical boom stop. When
the boom is raised to 80°, the boom stop springs
begin to compress.
As the boom is raised higher, spring compression
increases to exert greater force against the boom.
If for any reason the boom is raised to 89.5°, the
boom stop springs fully compress to provide a
physical stop.
6. To hold the boom in a set position, turn on the Drum 4
park switch. The boom hoist brake will apply and the
pawl will engage.
CAUTION
Avoid Rigging Damage
Check that the boom hoist wire rope is reeved through all
required sheaves and spooled properly onto the boom
hoist drum before raising the boom from the ground. For
related information, see Section 4 of the MLC165-1
Operator Manual for:
• For the Boom Assembly Drawing
• For Wire Rope Installation
Figure 3-9. Boom Hoist Control Handle
WARNING
Two-Blocking Hazard
While lowering the boom, pay out the load lines.
Otherwise, the load might contact the boom point or jib
point sheaves. This could result in the wire rope parting or
other parts breaking, allowing the load to fall.
CAUTION
Avoid Boom or Jib Damage
Do not turn on the boom hoist park switch while raising or
lowering the boom. This will bring the boom to an abrupt
stop which could cause shock load damage to the boom
and jib. First bring the boom to a smooth stop with the
handle, then turn on the boom hoist park switch.
Avoid Rigging Damage
If equipped with an upper boom point:
When lowering the boom to ground, remove the upper
boom point before the upper point contacts the ground.

Manitowoc MLC165-1 Specifications

General

Brand	Manitowoc
Model	MLC165-1
Category	Construction Equipment
Language	English