Manitowoc 2250 - Disconnecting Block-Up Limit Control; Removing Jib or Boom Point; Maintenance

Reference Only
HOISTS 2250 SERVICE/MAINTENANCE MANUAL
5-6
Published 11-06-15, Control # 040-13
Disconnecting Block-Up Limit Control
A shorting plug (Figure 5-3) is provided on the left front
corner of the adapter frame so the block-up limit system can
be disconnected for the following reasons:
• Crane setup and rigging
• Maintenance
• Operations not requiring use of a block-up limit control
(clamshell and dragline)
To disconnect the block-up limit system, proceed as follows
(see Figure 5-3
):
1. Disconnect electric cord (C1) from cable reel.
2. Remove the closure cap from shorting plug.
3. Connect electric cord (C2) to shorting plug.
4. Reverse steps to reconnect block-up limit control.
Removing Jib or Boom Point
For identification of junction boxes, electric cords, and
shorting plugs, see the Block-Up Limit Control Assembly
drawing following this section.
The junction boxes on the boom and jib points are equipped
with shorting plugs.
If the fixed jib point, upper boom point, or luffing jib point is
equipped with a block-up limit switch, the electric cord from
the limit switch must be connected to the proper shorting
plug when the corresponding attachment is removed.
Failing to perform this step will prevent the load drum from
hoisting and the boom from lowering. Also the operating limit
alert will come on.
Reconnect electric cord to proper block-up limit switch
when corresponding attachment is reinstalled.
Maintenance
Inspect and test the block-up limit control weekly or every
40 hours of operation, as follows:
NOTE: Do not operate the crane until cause for improper
operation and all hazardous conditions have been
found and corrected.
FIGURE 5-3
A1050
Shows cable reel mounting on boom butt.
Mounting on luffing jib butt similar.
For fixed jib and extended upper boom
point, extra cable is stored on a bracket on
outside of jib butt.
Item Description
1 Cable Reel
2 Junction Box on Boom Point
3Boom Butt
4 Electrical Cable C1
5 Electrical Cable C2
6 Shorting Plug
7 Left Front Corner of Adapter Frame
8 Top Junction Box in Adapter Frame
1
2
3
5
4
6
7
8