Manitowoc 14000 Service And Maintenance Manual

Reference Only
INTRODUCTION 14000 SERVICE MANUAL
1-36
Published 09-10-14, Control # 065-24
fluid flow is from pump outlet port B to motor inlet port.
Return fluid is from motor outlet port to pump inlet port A.
Node 4 controller output voltage to pump EDC and to motor
PCP is relative to control handle movement. As control
handle is pushed forward, pump swashplate angle is
increased. When system pressure exceeds the ECOR
(electric compensating over-ride) valve setting of 3600 psi
(248 bar), the valve shifts to direct flow from shuttle valve into
maximum displacement side of servo cylinder. The ECOR
valve over-rides the command from servo PC valve,
increasing motor displacement and output torque and
reducing output speed. When ECOR valve closes, control of
the motor returns to servo PC valve.
Node controllers are continuously balancing system
pressures and motor displacement angle so motor
displacement goes to minimum when control handle is fully
forward, if motor torque requirement is not too high. Node 1
controller monitors motor displacement and controls motor
speed by regulating hydraulic fluid flow through the pump.
Weight of the boom attempts to drive motor faster than return
fluid can return to low-pressure side of pump. System charge
pump maintains fluid supply at a positive pressure to motor.
Pump swashplate position restricts the returning fluid flow.
Pressure builds on fluid return side of closed-loop, acting as
a hydraulic brake to control lowering speed.
When control handle is moved toward neutral position,
node 1 controller compensates for hydraulic system leakage
or changing engine speed. This shifts motor back to
maximum displacement for slower output speed to slow
drum rotation.
When control handle is moved to neutral position, node 4
controller sends a zero output voltage to drum 4 pump EDC
that moves swashplate to center position. Node 1 controller
stores load holding pressure in pressure memory. After
control handle center switch opens, Node 4 controller sends
a zero output to disable brake release solenoid HS-11. Drum
4 brake valve shifts to block pilot pressure to brake and
opens a line to tank. When brake applies, an input signal is
sent to node 1 controller. Node 4 controller sends a zero volt
output to pump EDC to de-stroke pump.
X
X
X
Charge Pressure from
Drum 3/Left Travel Pump
To other Low
Pressure Accessories
Suction
Manifold
Drum 4 Pump #4
Boom Raise
Boom Lower
350 psi
(24 bar)
Pawl
Drum
Brake
Drum 4
Opens at 200 psi (14 bar)
Pressure
Sender
.060
Equalizing
Line
FIGURE 1-21
HS-11
HS-12
HS-13
4 g/m 15 L/m
14CSM1-111
A
B

Manitowoc 14000 Specifications

General

Brand	Manitowoc
Model	14000
Category	Construction Equipment
Language	English