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Reference
Only
Manitowoc
Published 01-08-13, Control # 049-05
6-9
2250 MAX-ER 2000 OPERATOR’S MANUAL
MAINTENANCE
6
MAX-ER LOAD SENSING PIN CALIBRATION
See Figure 6-9 for following procedure.
When replacing the load sensing pin, check its calibration
prior to installation, as follows:
1.
Start engine, select and confirm MAX-ER mode and
watch CTWT BHITCH on digital display.
2.
Connect electric cord to receptacle on end of pin.
3.
Backhitch load on digital display should be 0
±
5 tons
(U.S.). LOAD PIN system fault will go away if new pin is
okay.
4.
Install pin.
MAX-ER COUNTERWEIGHT CYLINDER
LIMIT SWITCH ADJUSTMENT
See Figure 6-8 for following procedure.
The left counterweight strap cylinder has a limit switch which
serves two purposes:
•
Limits how high the wheeled counterweight assembly
lifts off its foundation.
•
Turns off oil flow to both strap cylinders.
The following procedure assumes:
•
Counterweight assembly is resting on foundation.
•
Boom is resting on blocking at ground level.
•
Counterweight straps are not connected to cylinders.
1.
Remove capscrews holding limit switch mounting
bracket in stored position (View C).
2.
Extend cylinder rod past dimension shown in View A or
B.
3.
Mount limit switch mounting bracket to bracket support
for desired operating radius (View A or B).
Be sure to use correct mounting bracket holes (see table
and View D). Limit switch roller must be below cylinder
rod end.
4.
Verify that center of limit switch roller is at specified
dimension. Adjust if necessary (see step 5).
5.
If installing or adjusting limit switch:
a.
Loosen setscrew in limit switch lever.
b.
Position lever so center of roller is at specified
dimension (View A or View B).
c.
Securely tighten setscrew to lock adjustment.
6.
Connect electric cord to limit switch.
FIGURE 6-9
P1339
Electric
Cord
Load
Sensing
Pin
Gantry
Backhitch
Left Rear Corner
of Rotating Bed
Front of Crane
Gantry Raising
Cylinder
CAUTION
Hydraulic Cylinder Damage!
Cylinders will remain pressurized (stalled out) after
counterweight assembly lifts off foundation if limit switch is
n o t a d j u s t e d p r o p e r l y. T h i s a c t i o n c a n r e s u l t i n
overheating which will damage cylinders and other parts.
CAUTION
Limit Switch Damage!
Extending cylinder rod with limit switch in stored position
will damage switch. Remove switch and mounting bracket
from stored position before extending cylinder rod.
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