Manitowoc 2250 Service And Maintenance Manual

Reference Only
INTRODUCTION 2250 SERVICE/MAINTENANCE MANUAL
1-72
Published 11-06-15, Control # 040-13
Hydraulic Quick Disconnect
General
A self contained hydraulic system makes the mechanical
connections between the adapter frame and rotating bed
hydraulic lines during assembly/disassembly.
When cab power switch is on and engine fluid pressure
switch is closed (engine not running), power is available to
hydraulic quick disconnect switch at remote start junction
box on right side of rotating bed. Hydraulic quick disconnect
is operational after the following connections are made:
1. Connect boom stop electrical cable from rotating bed to
junction box plug and couplers on right side of adapter
frame.
2. Connect swing lock air lines from rotating bed to junction
box plug and couplers on right side of adapter frame.
3. Connect luffing jib pawl air lines from rotating bed to
junction box plug and couplers on right side of adapter
frame.
Hydraulic Quick Disconnect Engage
When hydraulic quick disconnect switch is moved to engage
position, an output signal is sent to engage hydraulic
solenoid HS-33 and hydraulic disconnect relay (HDR). The
relay sends an output signal to enable hydraulic quick
disconnect motor in the engage direction.
When hydraulic solenoid HS-33 is enabled the fluid from the
motor flows past relief valve that limits system pressure to
300 psi (21 bar), through the solenoid valve to piston end of
frame cylinder.
Frame cylinder extends rotating bed coupling plate and
sleeve plates together toward the adapter frame coupling
plate. Hydraulic quick disconnect closes as the fluid from rod
end returns to tank through sequence valve and then
solenoid HS-33.
Fluid also flows to the piston end of each coupling cylinder.
Fluid from each coupling cylinder rod end flows back to tank
through solenoid HS-33. Coupling cylinders extend to close
quick disconnect, completing hydraulic line coupling
between rotating bed and adapter frame.
Hydraulic Quick Disconnect Disengage
When hydraulic quick disconnect switch is moved to,
disengage position, an output signal is sent to disengage
hydraulic solenoid HS-34 and hydraulic disconnect relay
(HDR). The relay sends an output signal to enable hydraulic
quick disconnect motor in the disengage direction.
When hydraulic solenoid HS-34 is enabled the fluid from the
motor flows past relief valve that limits system pressure to
300 psi (21 bar).
Fluid from solenoid valve flows to rod end of side of each
coupling cylinder and through sequence valve to rod end of
main cylinder. A check valve blocks flow to main cylinder.
Then the coupling cylinders retract sleeve plate first to
unlock the couplings. Then at 200 psi (14 bar), sequence
valve opens to allow flow to frame cylinder. Frame cylinder
retracts, separating rotating bed coupling plate from adapter
frame coupling plate.
Hydraulic quick disconnect opens, separating the coupling of
hydraulic lines between rotating bed and adapter frame as
the fluid from piston end of the cylinders returns to tank
through solenoid HS-34.
7
ENGAGE
GND
PROGRAMMABLE
CONTROLLER
68R
7
3
START
RUN/STOP
CAB
POWER
REMOTE START
JUNCTION BOX
RF-43
RUN/STOP
1500 RPM
5DA
3
OIL PRESSURE
HYDRAULIC
DISCONNECT
DISABLE
0
HS
34
HDR
HS
33
DISENGAGE
HYDRAULIC
MOTOR
K1
FIGURE 1-43

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English