Manitowoc MLC650 Service Maintenance Manual

Reference Only
Manitowoc Published 09-09-16, Control # 229-09 5-35
MLC650 SERVICE/MAINTENANCE MANUAL HOISTS
5
55
Drum 5 Pawl Limit Switch
See Figure 5-17 for the following procedures.
Limit Switch Replacement
Removal
1. Land the load from the drum.
2. Lockout-tagout the crane.
3. Remove the screws (5) and the limit switch (1).
4. Remove the limit switch cover (7).
5. Disconnect the electrical wires, including the jumper
wire, inside the limit switch (see View C).
6. Remove the cable restraint connector (6) and carefully
pull the electrical cable and wires from the limit switch.
7. Loosen the screw (10) and remove the limit switch arm
(2) from the limit switch.
Installation
1. Connect the electrical wires to the limit switch as follows.
a. Remove the limit switch cover (7).
b. Connect the wires, including the jumper wire, to the
correct terminals in the limit switch (see View C).
c. Install and tighten the cable restraint connector (6)
to the limit switch (1).
d. Install the limit switch cover.
2. If necessary, reposition the limit switch head as follows.
a. Remove the screws (8).
b. Rotate the limit switch head (9) to the position
shown (see View B).
c. Install the screws (8).
3. Install the limit switch arm (2) onto the limit switch shaft
(11). Do not tighten the screw (10) at this time (see
View A).
4. Using the screws (5), install the limit switch (1).
Adjustment
1. Slowly turn the limit switch shaft (11) clockwise (as
viewed from shaft end) until the limit switch clicks open,
then hold the shaft.
2. Adjust the limit switch arm (2) 54° from the horizontal
position (see View B).
3. Adjust the limit switch position so that it will trip when the
pawl is fully disengaged from the drum.
4. Tighten the screw (10) to secure the limit switch arm (2)
to the limit switch shaft (11) and lock adjustment.
Weekly Maintenance
Inspect and test the limit switch device weekly or every 40
hours of operation as follows.
1. Inspect each limit switch arm for freedom of movement.
2. Inspect the entire length of each electrical cable for
damage.
3. Make sure the electrical cables are clear of all moving
parts and that cables are securely fastened with nylon
straps.
4. Make sure that all plugs are securely fastened.
WARNING
Falling Boom Hazard!
Avoid possible injury. Before performing the steps in this
section, land the loads and lower the boom onto blocking
at ground level. There is no positive means of holding the
boom up when the pawl is being serviced.

Manitowoc MLC650 Specifications

General

Brand	Manitowoc
Model	MLC650
Category	Construction Equipment
Language	English