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Reference
Only
Manitowoc
Published 01-08-13, Control # 049-05
6-13
2250 MAX-ER 2000 OPERATOR’S MANUAL
MAINTENANCE
6
2.
Test block-up limit control for proper operation using
either of following methods:
a.
BOOM LOWERED: Manually lift each weight —
one at a time — while engine is running. Load drum
should not operate in HOIST direction and boom
hoist should not operate in LOWER direction.
b.
BOOM RAISED: Slowly hoist each load block and
weight ball — one at a time — against weight.
When chain goes slack, corresponding load drum
should stop HOISTING and boom hoist should not
operate in LOWER direction.
Adjustment
See Figure 6-13 for following procedure.
Lower boom onto blocking at ground level and adjust each
limit switch as follows:
1.
Adjust spring tension so there is enough force to lift
weight of chain and rotate actuating lever when weight is
lifted. Note that limit switch at #79 lower boom point has
two springs.
2.
Loosen setscrew in limit switch lever so lever is free to
rotate.
3.
Manually lift weight so actuating lever rotates upward.
4.
Hold lever at Dimension A.
5.
Hold roller on limit switch lever against actuating lever
while performing step 6.
6.
Turn limit switch shaft CLOCKWISE only enough to
“click” limit switch open and hold. Then securely
tighten setscrew in limit switch lever.
7.
Test limit switch for proper operation (see Maintenance);
repeat adjustment steps until limit switch operates
properly.
WARNING
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;
otherwise, two-blocking may occur.
FIGURE 6-13
Setscrew
Spring
Enclosure
Adjusting Screw
(spring tension)
Elbow with
Cord Gripper
Grease
Fitting
Actuating Lever
Dimension A
1.04 in (26 mm)
Roller
Limit Switch
Lever
Shaft
Cover
A1050
Limit Switch for
#79 Lower Boom Point
(has 2 springs)
Limit Switch for all other
MAX-ER 2000 Attachments