Manitowoc Published 12-10-19, Control # 258-05 3-37
MLC90A-1/MLC100-1 OPERATOR MANUAL OPERATING CONTROLS AND PROCEDURES
OPERATING PROCEDURES
NOTE The following operating procedures assume the
following:
• Engine is already running.
• The correct capacity chart and crane config-
uration have been selected in the RCL/RCI
Display. For detailed instructions, see the RCL/
RCI Operation Manual.
Boom Hoist Operation
1. Adjust boom hoist speed to meet operator needs.
Speed can be adjusted between 25% and 100%. See
the Speed and Torque Setting Screen topic in the Main
Display Operation Manual for detailed instructions.
2. Make sure the automatic boom stop is set at the proper
angle (82°). For detailed instructions, see the Automatic
Boom Stop Adjustment topic in Section 4 of the Service
Manual.
3. Turn off the boom hoist park switch. It may be necessary
to raise the boom slightly to disengage the boom hoist
pawl.
The Pawl Engaged fault will come on if the pawl is
engaged when you attempt to lower the boom.
4. 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.
5. Pull the boom control handle BACK from off to RAISE
the boom or push the boom control handle FORWARD
from off to LOWER the boom.
The boom hoist brake will release and speed will
increase/decrease in relation to control handle
movement.
6. As the boom nears the desired angle, slowly move the
boom control handle toward off to decrease speed.
Then, move the control handle to off to stop the boom
when it reaches the desired angle. The boom hoist
brake will apply to hold the boom in position.
7. Besides the boom maximum up limit of 82°, a physical
boom stop is provided. The physical boom stop
cushions boom raising between approximately 59° and
the maximum boom angle. The boom stop also provides
a physical stop at 84°.
NOTE To hold the boom in position for long periods, turn on
the boom park switch. The boom hoist pawl will
engage.
CAUTION
Avoid Rigging Damage
Check that the boom hoist wire rope is reeved through all
sheaves and spooled properly onto Drum 4 before raising
the boom from the ground.
• For wire rope and reeving specifications, see the
Boom Assembly Drawing in Section 4 of the Operator
Manual.
• For instructions on attaching the wire rope to boom
hoist drum, see the Wire Rope Installation topic in
Section 4 of the Operator Manual.
Avoid Boom Damage
When operating at high boom angles and high load block
heights, maintain adequate clearance between the load
block and the boom top. If this precaution is not observed,
the load block can contact the boom top resulting in
damage to the boom top.
Figure 3-10. Boom (and Swing) Control Handle
CAUTION
Avoid Boom Damage
Do not turn on the drum park switch while raising or
lowering the boom. The brake will bring the boom to an
abrupt stop. This action could cause shock load damage
to the boom and load line. Bring the boom to a smooth
stop with the control handle and then turn on the drum
park switch.
WARNING
Avoid Two-Blocking Hazard
Pay out the load lines while lowering the boom. The load
may contact the boom point or jib point sheaves if this
step is not taken. The wire rope or other parts could
break, allowing the load to fall.
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