Manitowoc 2250 - Page 265

Reference Only
Manitowoc Published 11-06-15, Control # 040-13 5-7
2250 SERVICE/MAINTENANCE MANUAL HOISTS
5
1. Lower the boom onto blocking at ground level and
carefully inspect the following items:
a. Inspect each limit switch lever and actuating lever
for freedom of movement. Apply one-half shot of
grease to the fitting on the actuating lever. Wipe
away any excess grease.
b. Inspect each weight for freedom of movement on
the 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 the entire length of electric cords for
damage.
e. Check that the electric cords are clear of all moving
parts on the boom and jib and that the cords are
securely fastened to the boom and jib with metal
straps.
f. Check that all plugs are securely fastened.
2. Test the block-up limit control for proper operation using
either of the following methods:
a. BOOM LOWERED: Manually lift each weight, one
at a time, while the engine is running. The load drum
should not operate in the hoist direction and the
boom hoist should not operate in the lower
direction.
b. BOOM RAISED: Slowly hoist each load block and
weight ball, one at a time, against the weight. When
the chain goes slack, the corresponding load drum
should stop hoisting and the boom hoist should not
operate in the lower direction.
FIGURE 5-4
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
Lower Boom Point (multiple part),
#132 or #140 Fixed Jib (4 part),
Extended Upper Boom Point (4 part), or
Lower Luffing Jib Point (multiple part)
#132 or #140 Fixed Jib (1-3 part),
Standard or Extended Upper Boom Point (1-3 part),
Upper Luffing Jib Point (1 part)
See Load Block Reeving in Section 4 of the Operator’s
Manual for Suggested Location of Weight.
CAUTION
Two-Blocking Hazard!
Use extreme care when testing block-up limit control
when boom is raised. If block-up limit control fails to stop
load, immediately stop load by moving drum control
handle to off or by applying drum working brake to prevent
two-blocking.