Reference
Only
Manitowoc
Published 01-08-13, Control # 049-05
6-7
2250 MAX-ER 2000 OPERATOR’S MANUAL
MAINTENANCE
6
AUTOMATIC MAST STOP ADJUSTMENT
See Figure 6-7 for following instructions.
General
The mast can be used as a boom during MAX-ER assembly
and disassembly. For this purpose, the MAX-ER attachment
i s e q u i p p e d w i t h a l i m i t s w i t c h ( F i g u r e 6 -7 ) w h i c h
automatically stops the mast hoist and applies its brake
when the mast is raised to 80° maximum angle during
operation in the STANDARD mode. The limit switch also
turns on the operating limit alert in the operator’s cab when
the maximum angle is reached.
Maintenance
Prior to each use, check that the automatic mast stop stops
the mast at the 80° maximum angle; if not, replace any
defective parts and/or adjust the mast stop.
Electric Cord Connection
Plug the elec tri c c ord from the l imi t swi tch i nto the
appropriate socket in the electrical junction box on the left
side of the crane.
Adjustment
The automatic mast stop must be installed, adjusted and
sealed at initial installation. Readjustment is required only
when parts are replaced and when changing attachments.
The seals must be removed to allow readjustment.
1.
Mount actuator bracket to mast hinge pin (View A).
2.
Adjust position of limit switch in relation to actuator
bracket (View B):
a.
Move limit switch up or down in slots so edge of
roller is even with edge of actuator bracket and roller
is fully extended.
b.
Rotate actuator bracket to assure that overtravel will
not damage limit switch.
c.
Tighten bolts holding limit switch in slots.
3.
Using capscrews, mount actuator bracket to mast butt
(View A). Make sure capscrews are securely tightened.
4.
Select standard mode and confirm.
5.
Raise mast.
6.
Stop raising mast when rise in actuator bracket just
depresses limit switch roller and hold. Limit switch
should just “click” open (View C).
7.
Verify that mast angle is 80° (View A):
a.
Measure distance at two points approximately 2 ft
(600 mm) apart. Centerline is half the distance
measured.
b.
Place protractor-level on centerline.
c.
Check that reading is 80°.
8.
Lower mast several degrees.
9.
Slowly raise mast.
10. Mast must stop at 80° angle; if not, contact Crane Care
Customer Service at factory.
WARNING
Falling Attachment Hazard!
Do not operate crane unless automatic mast stop is
properly adjusted and operational.
Operation of mast above 80° angle is neither intended nor
approved when mast is used as boom. See MAX-ER
Assembly in Section 4 for details.
Mast can be pulled over backwards or collapse if operated
above 80° angle.
