Manitowoc Published 05-09-17, Control # 014-28 1-61
16000 SERVICE/MAINTENANCE MANUAL INTRODUCTION
Telescopic Beam Cylinder Retract
When telescopic beam switch is moved and held in retract
position, an input signal from wireless transmitter is sent to a
receiver on the crane. The receiver sends the input signal to
Node-1 controller. Node-7 sends a 24 volt output to enable
the telescopic beam solenoid HS-89 and shifts the valve to
retract position.
Node-3 controller also sends a variable zero to 24 voltage to
enable proportional relief solenoid HS-68 to provide
approximately 4,500 psi (310 bar) pressure to telescopic
beam system.
Hydraulic pressure from accessory pump flows through
pressure control pilot valve, three bank manifold valve, and
enters free-flow check valve section of counterbalance
valve. Fluid pressure on rod end of beam cylinder retracts
the beam to the desired length.
Hydraulic fluid from piston end of beam cylinder is blocked
by free-flow check valve section of counterbalance valve and
flow restraining section of relief valve preset for a relief
setting of 2,200 psi (152 bar). Piston end cylinder pressure
opens restraining section of counterbalance valve, allowing
fluid to exit valve. Return hydraulic fluid passes through three
bank manifold valve before returning to crane hydraulic tank
through return line.
When desired beam extension is reached, release switch to
lock cylinder in position. An input signal is sent to Node-1
controller. Node-7 controller sends a zero volt output to
hydraulic solenoid HS-89 to return valve to center position.
HS
90
HS
91
FIGURE 1-55
MAX-ER Base
Level Sensor
+
ā
PWR
CAB
System Fault Alarm
RCL Cab Fault Alarm
P11-07
P11-19
Display 1
Display 2
P11-01
P12-31
P12-32
P11-21
Start
WCP
CAN Power
Run 3
P12-24
Cab Power
Engine Stop
10 Amp
50 Amp
24 Volts
50 Amp
6C5A
6C5
CB7
6A
6C7
6C14
CB5
CB8
8C
8
NODE 0
NODE 1
(Master)
76-a
76-E
76-S 24 Volts
AI
Gnd
76-b
AI
73-n
24 Volts
73-b
AI
73-hGnd
Top Telescopic
Beam Position
Sensor
73-s
24 Volts
73-e
AI
73-kGnd
Bottom Telescopic
Beam Position
Sensor
A
B
C
D
2
3
1
2
3
1
Telescopic Beam
Hinge Pin In
76-C
76-B
76-D
76-C
76-G
76-F
76-H
76-G
HS
88
HS
89
Telescopic Beam
Hinge Pin Out
Telescopic Beam
Cylinder Extend
Telescopic Beam
Cylinder Retract
NODE 7
HS
68
34-C
34-D
Accessory System
Proportional Valve
NODE 3
M16-06
Hand-Held
Wireless
Remote
Telescopic Beam Cylinder
Gnd
DO
Gnd
Gnd
Gnd
Gnd
DO
DO
DO
DO
46-g
Accessory System
Pressure Sensor
46-j
46-h
Hyd
psi
24 Volts
AI
Gnd
2
3
1
NODE 4