Reference
Only
MAINTENANCE
2250 MAX-ER 2000 OPERATOR’S MANUAL
6-12
Published 01-08-13, Control # 049-05
Disconnecting Block-Up Limit Control
A shorting plug (Figure 6-11) is provided on the left front
corner of the upperworks adapter 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 6-11):
1.
Disconnect electric cord (C1) from cable reel (CRI).
2.
Remove the closure cap from shorting plug.
3.
Connect electric cord (C1) to shorting plug.
4.
Reverse steps to reconnect block-up limit control.
Removing Jib or Boom Point
The junction boxes on the boom and jib points are equipped
with shorting plugs.
If the fixed jib or upper boom point is equipped with a block-
up limit switch, the electric cord from the limit switch must be
c o n n e c t e d t o t h e p r o p e r s h o r t i n g p l u g w h e n t h e
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.
See Block-Up Limit Control Assembly Drawing in Section 4
of this manual for identification and location of the shorting
plugs.
Be sure to reconnect electric cord to proper block-up
l im i t s w i t c h w h en c o rre s p o n d in g a t t ac h m e n t i s
reinstalled.
Maintenance
Inspect and test the block-up limit control weekly or every
40 hours of operation, as follows:
Do not operate crane until cause for improper operation
and all hazardous conditions have been found and
corrected.
1.
Lower boom and jib (if equipped) onto blocking at
ground level and carefully inspect following items:
a.
Inspect each limit switch lever and actuating lever
for freedom of movement. Apply one-half shot of
grease to fitting on actuating lever; wipe away any
excess grease.
b.
Inspect each weight for freedom of movement on
load line.
c.
Inspect each weight, each chain, each shackle and
each connecting pin for excessive or abnormal
wear. Make sure cotter pins for shackles are
installed and spread.
d.
Inspect entire length of electric cords for damage.
e.
Check that electric cords are clear of all moving
parts on boom and jib and that cords are securely
fastened to boom and jib with nylon straps.
f.
Check that all plugs are securely fastened.
FIGURE 6-12
A1050
Chain
Shackle
Weight
Connecting
Pin
Dead-End Load Line
or Slowest Live Line
Chain
Shackle
Weight
Connecting
Pin
Two Chains Prevent
Weight from Turning
See Load Block Reeving in Section 4
for Suggested Location of Weight
Lower Boom Point (multiple part),
#132 Fixed Jib (4 part), or
Extended Upper Boom Point (4 part)
#132 Fixed Jib (1-3 part), or
Standard or Extended Upper Boom Point (1-3 part)
