Manitowoc 16000 - Page 73

Reference Only
Manitowoc Published 05-09-17, Control # 014-28 1-59
16000 SERVICE/MAINTENANCE MANUAL INTRODUCTION
1
Hydraulic fluid from piston end of jack 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 approximately 2,000 psi (138 bar). Piston end
cylinder pressure opens restraining section of
counterbalance valve, allowing fluid to exit valve. Return
hydraulic fluid passes through six bank manifold valve before
returning to crane hydraulic tank through return line.
When desired jack cylinder retraction is reached, release
selected jack switch to lock jack cylinder(s) in position.
Hydraulic fluid at piston end of jack cylinder counterbalance
valve supports the weight and gravity force of the wheeled
counterweight assembly.
When selected jack switch is released, an input signal is sent
to Node-1 controller. Node-7 controller sends a zero volt
output to hydraulic solenoid HS-75 to return valve to center
position.
Node-3 sends a variable voltage output to accessory system
proportional relief solenoid HS-68 to provide approximately
400 psi (28 bar) system pressure.
Left Rear Jack
FIGURE 1-54
Proportional
Relief Valve
Suction
Manifold
Variable Accessory
Pump 400 to 5,000
psi
(28 to 345 bar)
Pressure Control
Pilot
To Other MAX-ER
Systems
Six Bank Valve Manifold
HS-75
HS-74
Left Front Jack Extend
HS-77
HS-76
HS-79
HS-78
Left Rear Jack
Proportional
Relief Valve
Suction
Manifold
Variable Accessory
Pump 400 to 5,000
psi
(28 to 345 bar)
To Other MAX-ER
Systems
Six Bank Valve Manifold
HS-75
HS-74
Left Front Jack Retract
HS-77
HS-76
HS-79
HS-78
4,500 psi
(310 bar)
Pressure Control
Pilot
4,500 psi
(310 bar)
HS-68
HS-68
M16-04
M16-05