Manitowoc MLC650 Service Maintenance Manual

Reference Only
Manitowoc Published 09-09-16, Control # 229-09 5-63
MLC650 SERVICE/MAINTENANCE MANUAL HOISTS
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4. Test the block-up limit devices for proper operation
using either of the following two methods:
• Boom Lowered Method
While the boom is lowered and with the engine
running:
Manually lift one of the weights. Try to operate the
corresponding hoist control. The drum must not turn
in the raise direction and the boom/mast drum must
not operate in the down direction.
Test each block-up limit device this way.
• Boom Raised Method
Slowly hoist one of the load blocks and the weight
ball against the weight. When the chain goes slack,
the corresponding load drum must stop and the
boom/mast hoist must not operate in the down
direction.
Test each block-up limit device this way.
Switch Adjustment and Replacement
Overview
The spring should have sufficient strength and stiffness to lift
the weight of the chain to force the actuator lever to rotate
against the limit switch arm, activating the limit switch. The
switch then sends a signal to a control module, which sends
a corresponding signal to the appropriate cab display.
NOTE: The spring eyebolt distance and the limit switch
arm are preset at the factory and are adjustable in
service or at replacement.
Always bring the corresponding function to a complete stop
before adjusting or replacing the limit switch.
CAUTION
Avoid Sheave Damage!
Use extreme care when testing the block-up limits when
the boom is raised. If a block-up limit fails to stop the load,
immediately stop the hoist.
CAUTION
Avoid Sheave Damage!
Do not lengthen or shorten the chains that hold the block
limit weights. Proper chain length and weight is necessary
for proper switch activation.
If replacement is needed, replace with the same length,
size, and material as specified on the engineering
drawing.

Manitowoc MLC650 Specifications

General

Brand	Manitowoc
Model	MLC650
Category	Construction Equipment
Language	English