Manitowoc 2250 Service Maintenance Manual

Reference Only
Manitowoc Published 07-19-16, Control # 249-01 1-89
2250 SERVICE/MAINTENANCE MANUAL INTRODUCTION
1
The PC enables the MAX-ER’s electronic and hydraulic
systems to automatically extend and retract the
counterweight strap cylinders to raise and lower the wheeled
counterweight assembly in response to changes in backhitch
tension:
• At 30 U.S. tons of tension on the backhitch load-sensing
pin, the strap cylinders begin to retract. At 28 tons of
tension, the strap cylinders stop retracting.
• At less than 4 tons of tension on the backhitch load-
sensing pin, the strap cylinders begin to extend. At
6 tons of tension, the strap cylinders stop extending.
• If the calculated strap cylinder load drops below 7.5 tons
of tension, strap cylinders stop retracting, because the
wheeled counterweight trailer should be on the ground.
If the left side strap cylinder limit switch is tripped, neither
strap cylinder will retract.
The PC also monitors the pressure senders in both right side
and left side rod end strap cylinders and right side piston end
strap cylinder hydraulic circuit to control the raising or
lowering of the counterweight assembly when operating. The
operating pressure range is from 0 to 3,000 psi
(0 to 207 bar).
138 bar
Wheeled Counterweight Trailer
X
(200 psi)
13,8 bar
XX
X
RM-14
HS41
HS40
T
Left Strap
Right Strap
T
Cylinder
Cylinder
MAX-ER Accessory Valve
Extend
Retract
T
FIGURE 1-58
152 bar
207 bar (3,000 psi)
Stop Cylinders
From Mast
Stop Cylinders
To Mast
Mast
Accumulator
T
To Jib Strut
Cylinders
Jib Strut
Cylinders
From
Pressure
Sender
Accumulator
Mast
(2,200 psi)
207 bar
(3,000 psi)
(2,000 psi)
Accessory
To Crane
Crane
Manifold
Suction
Aux
Fan
Valves
HS12
Valve
Disable-Relie
f
Auxiliary System

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English