Manitowoc 2250 Service And Maintenance Manual

Reference Only
Manitowoc Published 11-06-15, Control # 040-13 4-1
2250 SERVICE/MAINTENANCE MANUAL BOOM
4
SECTION 4
BOOM
AUTOMATIC BOOM STOP ADJUSTMENT
General
This crane has limit switches which automatically stop the
boom hoist and apply its brake when the boom is raised or
lowered to a preset angle.
The limit switches are set at the following angles depending
on boom use:
Operating Angle
See Figure 4-1 for the following procedure.
• 83
° maximum (MAX) without layout luffing jib
• 88
° maximum (MAX) with layout luffing jib when the
boom up limit can be bypassed
• 89
° maximum (MAX) with layout luffing jib when the
boom up limit cannot be bypassed
To determine if the boom up limit can be bypassed on your
crane, perform the Limit Bypass Test, given on page 4-2.
• 0° minimum (MIN) the minimum boom stop is optional.
It can be adjusted to any angle between 4° above or
below horizontal.
NOTE: For MAX-ER 2000 boom angles, refer to the
Operator Manual supplied with the MAX-ER.
Setup Angle
• 89° with boom butt in crane setup mode
The operating angle is bypassed when the crane is in
the setup mode. The setup angle is bypassed when the
setup selector is switched off.
Operation
See Figure 4-2 for the following description.
When the boom is below the maximum angle, limit switch
(2a) is closed. The boom hoist can be operated.
When the boom is raised to the maximum angle, actuator
(3a) opens limit switch (2a). Boom hoist operation stops
automatically because the open limit switch turns off power
to the boom hoist electric circuit. The boom hoist pump shifts
to neutral and the boom hoist brake applies to stop boom
movement.
NOTE An optional minimum boom stop is available. It
operates the same as the maximum boom stop, but
in the down direction.
Maintenance
At least once weekly, check that the automatic boom stop
stops the boom at the specified maximum angle. If not,
replace any worn or damaged parts and/or adjust the boom
stop.
Once the automatic boom stop is properly adjusted, it should
not require periodic adjustment. Adjustment is required,
however, when:
• The luffing jib is installed or removed
• Parts are replaced
WARNING
Falling Attachment Hazard!
If boom fails to stop for any reason, stop engine
immediately. Troubleshoot system to determine problem.
Do not resume operation until problem has been
corrected.
WARNING
Falling Attachment Hazard!
Do not operate the crane unless automatic boom stop is
properly adjusted and operational. Do not adjust
maximum operating angle higher than specified. Boom
could be pulled over backwards or collapse, causing
death or serious injury.

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English