Manitowoc 16000 Service And Maintenance Manual

Reference Only
Manitowoc Published 05-09-17, Control # 014-28 1-37
16000 SERVICE/MAINTENANCE MANUAL INTRODUCTION
1
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.
Node controllers continuously balance drum system
pressures and monitor motor displacement angle so motor
displacement goes to minimum when control handle is all the
way back, if motor torque requirements are not too high.
Node-1 controller monitors motor displacement and controls
motor speed by regulating the hydraulic fluid flow through the
pumps.
When drum 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 each pump EDC that moves swashplate to
center position. This shifts the motors 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-5
controller sends a zero output voltage to disable drum brake
release solenoid HS-20. Drum brake solenoid valve shifts to
block pilot pressure to brakes and opens a line to tank.
Brakes apply before drum pumps de-stroke.
When brake applies, an input signal is sent to Node-1
controller. Node-3 controller sends a 0 volt output to each
pump EDC to de-stroke pumps. Node-3 and 5 controllers
send a 0 volt output to each motor PCP.
Drum 1 to drum 2 diverting solenoid HS-16 remains enabled
until drum 1 handle is moved.
Lowering Load
See Figure 1-27 and Figure 1-28 for the following procedure.
When drum 2 control handle is moved forward for lowering,
an input voltage of 2.6 volts or more is sent to Node-1
controller. Node-3 controller sends a variable zero to 24 volt
output that is divided by a resistor and applied to pump 6
EDC in the raising direction. Node-4 controller sends a 24
volt output to enable drum 1 to drum 2 diverting solenoid HS-
16. Node-3 controller sends a variable zero to 24 volt output
that is divided by a resistor and applied to pump 4 EDC in the
raising direction. Both pumps supply hydraulic fluid to drum
2 motors. Node-3 and 6 controllers send a variable zero to
24 volt output that is divided by a resistor and applied to both
motor PCP’s. Node-1 controller checks that drum block-up
limit switches are closed and no system faults are present.
Pump EDC tilts swashplate in the raising direction to satisfy
pressure memory. Node-1 controller compares drum holding
pressure to value in pressure memory. When system
pressure is high enough, Node-6 controller sends a 24 volt
output to enable drum 2 brake release solenoid HS-20. Drum
brake solenoid shifts to block drain port and opens port to
low-pressure side of drum system to release brake from
drum shaft.
Each pump EDC tilts swashplate in the lowering direction as
hydraulic fluid flow is from pump ports to motor ports. Return
fluid is from motor outlet ports to pump inlet ports.
Node-3 controller output voltages to each pump EDC and
Node-3 and 5 controllers output voltage to each motor PCP
is relative to control handle movement. As control handle is
moved back, an output voltage increases the pumps
swashplate angles.
NOTE: If drum 1 is selected to be operated at the same
time, Node-4 controller sends a 24 volt output to
disable drum 1 to drum 2 diverting solenoid HS-16.
Drum 2 speed is reduced up to one half.
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.
Node controllers continuously balance drum system
pressures and monitor motor displacement angle so motor
displacement goes to minimum when control handle is fully
forward, if motor torque requirements are not too high. Node-
1 controller monitors motor displacement and controls motor
speed by regulating the hydraulic fluid flow through the
pumps.
When drum 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 each pump EDC that moves swashplate to
FIGURE 1-27
HS-7
HS-20
HS-16
HS-21
Brake
Diverting
Valve
Motors
(PCP)
Pump
(EDC)
Pressure
Sender
Pump
(EDC)
16-1019
Accessory Pump
(Low-Pressure)
Accessory
Pump (Low-
Pressure)

Manitowoc 16000 Specifications

General

Brand	Manitowoc
Model	16000
Category	Construction Equipment
Language	English