INTRODUCTION 2250 SERVICE/MAINTENANCE MANUAL
1-88
Published 07-19-16, Control # 249-01
Counterweight Strap Cylinders
See Figure 1-57 and Figure 1-58 for the following.
When the MAX-ER mode is selected, the load-sensing pin in
the gantry left side backhitch measures loading created by
the lifted load. The load-sensing pin sends a proportional 0.8
to 8.0 V signal to the crane’s programmable controller (PC).
The crane’s PC converts the load-sensing pin voltage signal
to U.S tons that is displayed on the MAX-ER (MXR) screen.
The counterweight strap cylinders automatically lift the
wheeled counterweight assembly off the ground and set it
back down when required depending on the load (governed
by boom angle, boom length, and lifted load). When the
wheeled counterweight assembly is off the ground, the crane
can swing and travel in a 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.
DANGER
Collapsing Mast Hazard!
Avoid possible injury. After the straps are pinned to the
strap cylinders, do not manually retract the cylinders. The
mast can be pulled over backward. The strap cylinders
automatically adjust when MAX-ER mode is selected.
Tipping Hazard!
The counterweight switch can be used to extend the mast
strap cylinders manually if the load-sensing pin fails. Any
other use of this control is neither intended nor approved.
56MB
56MA
90L
90k
POWER
HS
43
HS
52
HS
53
HS
89J4
89K4
0
15 Amp
5A
8K
RM-13
Swing/Crab (steering cylinder extend)
Steering Pins Extend
Steering Pins Retract
Counterweight Strap
Cylinder Extend
Counterweight Strap
Cylinder Retract
MAX-ER 2000 Remote
12
HS
HS
42
Swing/Crab (steering cylinder retract)
HS
40
41
FIGURE 1-57
89H4
MAX-ER 2000
Programmable
Controller
Auxiliary System
Disable-Relief Valve
Crane
Programmable
Controller
88S
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