HOISTS MLC300 SERVICE/MAINTENANCE MANUAL
5-38
Published 11-22-17, Control # 257-02
DRUM 6 MINIMUM BAIL LIMIT
See Figure 5-21 for the following procedures.
The minimum bail limit stops drum 6 from lowering when
there are three to four wraps of wire rope remaining on the
drum.
When the limit is reached, the operating limit
fault is activated and the fault icon appears in
the fault bar of the Main Display Working
Screen.
• The drum can be operated in the hoist direction after the
limit is contacted.
• The limit can only be bypassed by disconnecting the
electric cable from the limit switch and connecting the
supplied shorting plug (9).
Pre-Adjustment
1. Pay out the wire rope from drum 6 until there are three to
four wraps of rope on the first layer of the drum and the
rollers (2) are against the bare drum barrel.
2. Lockout-tagout the crane.
Spring Adjustment
Adjust the eyebolt jam nuts (7) so there is enough spring
tension to hold the rollers (2) firmly against the bare drum
barrel.
NOTE: The eyebolts were initially adjusted to the
dimension (8).
Limit Switch Adjustment
1. With the rollers (2) contacting the bare drum barrel,
loosen the jam nut (3).
2. Adjust the bolt (4) until it depresses the limit switch
plunger to the dimension (5).
3. Hold the bolt in place and tighten the jam nut.
4. Start the engine and check for proper operation.
WARNING
Falling Load Hazard!
When lowering a load below the minimum bail limit, do so
slowly with extreme caution. Do not lower the load to the
point where less than three full wraps of wire rope are on
the drum. The wire rope could be pulled out of the drum,
allowing the load to fall.
Item Description
1 Limit Switch
2Rollers
3Jam Nut
4Bolt
5 Dimension: 44 mm (1.7 in)
6 Eyebolt (3)
7Jam Nut (6)
8 Dimension: 35 mm (1.4 in)
9 Shorting Plug
Limit Switch Wiring
Wire Color
Switch
Terminals
Function
Black 13 Normally Open
Green 14 Input
White 21 Normally Closed
Blue 14 22 Jumper
FIGURE 5-21
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