Manitowoc 2250 Service Maintenance Manual

Reference Only
Manitowoc Published 07-19-16, Control # 249-01 1-75
2250 SERVICE/MAINTENANCE MANUAL INTRODUCTION
1
MAX-ER Modes
In Setup mode, the PC operates the same as in Standard
mode, but the boom-up limit is bypassed.
In Luffing Jib mode, drum 5 cannot operate unless drum 4 is
parked. In Standard mode, drum 4 cannot operate unless
drum 5 is parked.
In MAX-ER mode, the PC responds to load changes by
raising or lowering the wheeled counterweight assembly.
The PC applies drum 9 brakes, controls crawler travel pump
speed, and selects control handle operation depending on
the crane’s mode version. See Operating Controls in Section
3 of the MAX-ER Operator Manual for MAX-ER operation.
Electrical System
An electrical cable (W27) from the MAX-ER’s programmable
controller on the crane to the MAX-ER’s junction box on the
wheeled counterweight trailer provides electrical wiring to
the MAX-ER’s components.
MAX-ER electrical components include the following:
• Strap cylinders limit switch
• Strap cylinders pressure senders
• Counterweight tilt sensor
• MAX-ER accessory valve solenoids
• MAX-ER remote switch assembly
Other MAX-ER electrical components mounted on the crane
include the following:
• Load pin sensor
• Mast backhitch pin cylinders
• Rear or right rear drum pawl
• Rear or right rear drum pawl limit switch
• Drum 9, crawler travel, and boom hoist diverting valves
• Mast angle limit
• Boom angle indicator
• Maximum boom angle limit switch
• Mast backhitch pins remote switch assembly
Other MAX-ER electrical components for drum 9 mounted on
the boom butt include the following:
• Left/right motor controls
• Flange speed sender
• Minimum bail limit switch
• Drum pawl
• Drum brakes
MAX-ER Remote Switch Assembly
With the engine running, power is available to the MAX-ER’s
remote switch assembly when the power cable (W28) is
plugged into the receptacle on the left side of the
counterweight trailer. The counterweight raise/lower switch
is only active in Setup mode. All other switches can be
operated in any crane-operating mode. When the power
button on the MAX-ER remote is pressed, power is enabled
to operate the MAX-ER’s cylinders.
When a MAX-ER remote switch is enabled, an input signal is
sent to the PC. The crane’s PC sends an output signal to
shift the crane’s auxiliary system disable-relief valve HS-12
to block the valve’s bypass. This increases the MAX-ER’s
accessory pressure to 207 bar (3,000 psi) to operate the
MAX-ER’s cylinders.
The auxiliary system’s disable-relief valve HS-12 is set at
276 bar (4,000 psi) and protects the MAX-ER systems from
excessive pressure by opening to the tank when the
accessory items are disabled.
Mast Backhitch Pins Remote Switch
With the engine running, power is available to the mast
backhitch pins remote switch when the power cable (W29) is
plugged into the receptacle at the bottom main junction box
on the left side of the crane.
When the power and retract buttons are pressed, the
backhitch cylinders retract the mast backhitch pins. When
the power button and retract buttons are released, the
backhitch cylinders, with spring assist, extend the mast
backhitch pins.
Digital Display
Scroll to the CTWT BHITCH screen of the digital display to
observe the counterweight position. The CTWT indicates UP
or DOWN position of the wheeled counterweight assembly.
BHITCH indicates backhitch loading in U.S. tons.
The MAX-ER (MXR) diagnostic screen displays the PC-
monitored operating conditions. System messages are
shown in Tables 1, 2, and 3 in Troubleshooting
Section 10.

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English