Manitowoc 16000 - Extend Telescopic Beam Cylinder; Retract Telescopic Beam Cylinder

Reference Only
INTRODUCTION 16000 SERVICE/MAINTENANCE MANUAL
1-64
Published 05-03-17, Control # 228-03
Extend Telescopic Beam Cylinder
When the telescopic beam switch is moved and held in the
extend position, an input signal from the wireless transmitter
is sent to a receiver on the crane. The receiver sends the
input signal to the Node-1 controller. Node-7 sends a 24 volt
output to enable the telescopic beam solenoid HS-88 and
shifts the valve to the extend position.
The Node-3 controller also sends a variable 0 to 24 voltage
to enable the proportional relief solenoid HS-68 to provide
approximately 310 bar (4,496 psi) pressure to the telescopic
beam system.
Hydraulic pressure from the accessory pump flows through
the pressure control pilot valve, the three bank manifold
valve, and enters the free-flow check valve section of the
counterbalance valve. Fluid pressure on the piston end of
the beam cylinder extends the beam to the desired length.
Hydraulic fluid from the rod end of the beam cylinder is
blocked by the free-flow check valve section of the
counterbalance valve and the flow restraining section of the
relief valve preset for a relief setting of 152 bar (2,205 psi).
The rod end cylinder pressure opens the restraining section
of the counterbalance valve, allowing the fluid to exit the
valve. Return hydraulic fluid passes through the three bank
manifold valve before returning to the crane hydraulic tank
through the return line.
When the desired beam extension is reached, release the
switch to lock the cylinder in position. An input signal is sent
to the Node-1 controller. The Node-7 controller sends a zero
volt output to the hydraulic solenoid HS-88 to return the valve
to the center position.
The Node-3 sends a variable voltage output to the accessory
system proportional relief solenoid HS-68 to provide
approximately 207 bar (3,002 psi) system pressure.
Retract Telescopic Beam Cylinder
When the telescopic beam switch is moved and held in the
retract position, an input signal from the wireless transmitter
is sent to a receiver on the crane. The receiver sends the
input signal to the Node-1 controller. Node-7 sends a 24 volt
output to enable the telescopic beam solenoid HS-89 and
shifts the valve to the retract position.
The Node-3 controller also sends a variable 0 to 24 voltage
to enable the proportional relief solenoid HS-68 to provide
approximately 310 bar (4,496 psi) pressure to the telescopic
beam system.
Hydraulic pressure from the accessory pump flows through
the pressure control pilot valve, the three bank manifold
valve, and enters the free-flow check valve section of the
counterbalance valve. Fluid pressure on the rod end of the
beam cylinder retracts the beam to the desired length.
Hydraulic fluid from the piston end of the beam cylinder is
blocked by the free-flow check valve section of the
counterbalance valve and the flow restraining section of the
relief valve preset for a relief setting of 152 bar (2,205 psi)
The piston end cylinder pressure opens the restraining
section of the counterbalance valve, allowing fluid to exit the
valve. Return hydraulic fluid passes through the three bank
manifold valve before returning to the crane hydraulic tank
through the return line.
When the desired beam extension is reached, release the
switch to lock the cylinder in position. An input signal is sent
to the Node-1 controller. The Node-7 controller sends a zero
volt output to the hydraulic solenoid HS-89 to the return valve
to the center position.
The Node-3 controller sends a variable voltage output to the
accessory system proportional relief solenoid HS-68 to
provide approximately 207 bar (3,002 psi) system pressure.