Manitowoc 2250 Service And Maintenance Manual

Reference Only
INTRODUCTION 2250 SERVICE/MAINTENANCE MANUAL
1-96
Published 11-06-15, Control # 040-13
Mast Stop
Mast Stop Cylinders
See Figure 1-61 for the following procedure.
Mast stop cylinders are connected to the mast and contact
the gantry pins to stop the mast when at or near maximum
mast angle. The hydraulically filled cylinders act as shock
absorbers to cushion the mast as it contact the gantry. After a
certain distance, the mast stop cylinders bottom out to stop
mast travel.
Mast Stop System Operation
See Figure 1-61 for the following procedure.
The crane auxiliary pump supplies pressurized hydraulic
fluid to mast stop cylinders and jib strut cylinders at 2,200 psi
(152 bar) to 2,900 psi (200 bar). The system pressure is
monitored and controlled by the mast accumulator pressure
sensor. From crane auxiliary pump, pressurized hydraulic
goes through quick disconnect at mast butt, through an in-
line check valve, and into an accumulator mounted on the
mast butt.
RM-16
2600 psi (179 bar)
2400 psi
MAST STOP
CYLINDERS
JIB STRUT
RESERVOIR
JIB STRUT
2100 psi (145 bar)
2100 psi (145 bar)
RELIEF VALVE
RELIEF VALVE
CYLINDERS
FIGURE 1-61
BOOM
MAST
2200 psi
ACCUMULATOR
T
PRESSURE
SENDER
ACCUMULATOR
MAST
(166 bar)
3000 psi (207 bar)
(152 bar)
NOTE: Past units have an
unloader valve that cuts in
at 2,300 psi (159 bar) and
cuts out at 2,900 psi (200
bar).

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English