Reference
Only
Manitowoc
Published 01-08-13, Control # 049-05
3-13
2250 MAX-ER 2000 OPERATOR’S MANUAL
OPERATING CONTROLS AND PROCEDURES
3
15. Warn all personnel to stand well clear of crane. Wheeled
counterweight assembly rises and lowers automatically
without warning — it can strike or land on personnel.
Provide a signal person for all crane operations.
Have signal person watch wheels while swinging and
traveling. Do not allow tires to strike or roll over
obstructions.
16. Depending on lifted load, clearance under tires when
they are off ground should be 6 – 12 in (152 – 305 mm).
17. Check and level wheeled counterweight assembly
independently of crane.
18. Observe following precautions for counterweight trailer
jacking cylinders:
a.
Make sure foundation is strong enough to support
load placed on counterweight trailer jack pads. Steel
or timber mats must be used to distribute loading as
required.
b.
Maximum load on each counterweight trailer jack is
281,000 lb (127 462 kg).
c.
Area of each jack pad is 731 in
2
(4 716 cm
2
).
d.
Prior to operating jacking cylinders when wheeled
counterweight assembly is connected to crane,
make sure all pins are in proper position (see Table
3-3 and Figure 3-21 on page 3-17). Structural
damage is possible if pins are in wrong position.
e.
Prior to operating jacking cylinders when wheeled
counterweight assembly is disconnected from
crane, make sure all pins are in proper position (see
Table 3-3 and Figure 3-21 on page 3-17). Wheeled
counterweight assembly will fall over if this step
is not performed.
OPERATING THE MAX-ER
Handling Loads
1.
Select and confirm desired main mode — Standard,
Drum 5 [Luff Jib], Drum 5 [Aux Hst] — and MAX-ER
mode.
2.
For Crane Software Version 2007 and higher, select and
confirm counterweight trailer control – either ON if trailer
is attached or OFF if trailer is removed.
If trailer is removed, you must use 0 Lb Wheeled
Counterweight column of applicable MAX-ER
Capacity Chart.
3.
Scroll to CTWT BHITCH position of digital display to
observe counterweight position.
4.
The counterweight cylinders will automatically lift the
counterweight assembly off the ground and set it back
down when required depending on load (governed by
boom angle, boom length, lifted load).
5.
When the wheeled counterweight assembly is off the
ground, the crane can be swung and traveled in the
normal manner to position the crane and load.
When the wheeled counterweight assembly is on the
ground, the wheels must be properly positioned before
swinging or traveling the crane.
6.
Block crawlers if required before lowering boom to
ground (see MAX-ER Capacity Chart for requirements).
WARNING
Crushing Injury Hazard!
If wheeled counterweight assembly is off ground, it will
lower to ground as weight of boom is lowered onto
blocking.
Rigging personnel beware! Once counterweight lands,
boom lowering speed may increase suddenly for a short
distance. Keep clear of boom until it has been stopped
and is at rest.
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