Manitowoc 16000 Service And Maintenance Manual

Reference Only
INTRODUCTION 16000 SERVICE/MAINTENANCE MANUAL
1-30
Published 05-09-17, Control # 014-28
system pressure exceeds the PCOR (Pressure
Compensating Over-Ride) valve setting of 4,930 psi (340
bar), the valve shifts to direct flow from shuttle valve into
maximum displacement side of servo cylinder. The PCOR
valve over-rides the command from servo PC valve,
increasing motor displacement and output torque and
reducing output speed. When PCOR valve closes, control of
the motor returns to servo PC valve.
Node controllers are continuously balancing the system
pressure and the motor displacement angle so the motor
displacement goes to minimum when control handle is fully
back, if the motor torque requirement is not too high. Nodes-
4 and 5 controllers monitors motor displacement and
controls motor speed by regulating the hydraulic fluid flow
through the pumps.
When control handle is moved to neutral position, Node-1
controller compensates for hydraulic system leakage or
changing engine speed. Node-3 controller sends a zero
output voltage to hoist pump EDC that moves swashplate to
center position. This shifts the motor back to maximum
displacement for slower output speed to slow drum rotation.
When control handle is moved to neutral position, Node-1
controller stores the load holding pressure in pressure
memory. After control handle center switch opens, Node-4
controller sends a zero output voltage to disable brake
release solenoid HS-10. Drum brake solenoid valve shifts to
block pilot pressure to brakes and opens a line to tank.
Brakes apply before drum pump de-strokes.
Lowering Boom
See Figure 1-21 and Figure 1-22 for the following procedure.
When boom/mast hoist control handle is moved forward for
booming down, an input voltage of 2.6 volts or more is sent
to Node-1 controller. Node-3 controller sends a variable 0 to
24 volt output that is divided by a resistor and applied to
pump EDC.
Node-4 and 5 controllers send a variable zero to 24 volt
output that is divided by a resistor and applied to each hoist
motor PCP. Node-1 controller checks that boom up limit
switch is closed and no hydraulic system fault is present.
The pump EDC tilts swashplate in the up direction to satisfy
pressure memory. Node-1 controller compares drum holding
pressure to value in pressure memory. When system
pressure is high enough, Node-4 controller sends a 24 volt
output to brake release solenoid HS-10. The brake solenoid
shifts to block drain port and opens port to low-pressure side
of system to release boom/mast hoist drum brake.
When brake is released, the pump EDC tilts the swashplate
to stroke pump in the down direction. In the down direction,
hydraulic fluid flow is from pump port to motor port. Return
fluid is from motor outlet ports to pump inlet port.
Node-3 controller output voltage to the pump EDC and
Node-4 and 5 controllers output voltage to each motor PCP
is relative to control handle movement. As control handle is
pushed forward, pump swashplate angle is increased. When
system pressure exceeds the PCOR (Pressure
Compensating Over-Ride) valve setting of 4,930 psi (340
bar), the valve shifts to direct flow from shuttle valve into
maximum displacement side of servo cylinder. The PCOR
valve over-rides the command from servo PC valve,
increasing motor displacement and output torque and
reducing output speed. When PCOR valve closes, control of
the motor returns to servo PC valve.
FIGURE 1-21
HS-10
HS-12
HS-11
HS-13
HS-14
Brake
Diverting
Valve
Pawl
Pump
(EDC)
16-1013
Accessory Pump
(Low-Pressure)
Accessory Pump
(Low-Pressure)
Motor
(PCP)
Pressure
Sender

Manitowoc 16000 Specifications

General

Brand	Manitowoc
Model	16000
Category	Construction Equipment
Language	English