Manitowoc 16000 Service And Maintenance Manual

Reference Only
Manitowoc Published 05-09-17, Control # 014-28 1-39
16000 SERVICE/MAINTENANCE MANUAL INTRODUCTION
1
LOAD/LUFFING DRUM 3
System Components
See Figure 1-29, Figure 1-30, and Figure 1-31 for the
following procedure.
The Load/luffing drum 3 is located in the boom butt. The
drum can be configured for either luffing jib operation or as
an auxiliary drum. If drum 3 is rigged for luffing jib operation it
can not be used as a load drum.
One hydraulic pump drives one motor gearbox on left side
end of drum 3. The left travel pump is dedicated to operate
drum 3 though a diverging valve. The left track and drum 3
can not be operated at the same time. Hydraulic connections
between the pump and motor form a closed-loop system that
is controlled with control handle movement and node
controllers. The far load drum control handle on the right side
console operates drum 3 when configured a load drum.
When configured as a luffing jib the control handle on left
side console operates drum 3. The control handle is
inoperable when drum 3 park brake is applied.
Hydraulic charge pressure from system charge pump
supplies hydraulic make-up fluid to low-pressure side of
motor. A pressure sender in high-pressure side of pump leg
provides system pressure information to Node-1 controller.
Low-side pressure supplies hydraulic pilot pressure to
operate motor servos. A fixed orifice between pump ports A
and B allows for smoother drum operation.
When load drum 3 motors rotate, a speed sensor at motor
rotor monitors and sends an input voltage to Node-1
controller. Node-2 controller sends an output voltage to
rotation indicator in control handle. As drum rotates faster,
the rotation indicator on top of control handle pulsates with a
varying frequency that indicates drum rotational speed. The
handle command in percent from neutral is shown on
Diagnostic Screen.
Continuous changing of closed-loop fluid occurs with
leakage in pump, motor, and external sequence/flow valve.
Sequence/flow valve opens at 200 psi (14 bar) and removes
4 gallons per minute (15 l/m) of hot fluid from system by
discharging exhausted fluid into motor case where the fluid
returns to tank.
Load Drum 3 Brake and Pawl
Hydraulic pressure to operate drum 3 brake is from low-
pressure side of system. Hydraulic pressure to operate drum
pawl is from low pressure accessory system.
When drum 3 brake switch is in on - park position, drum
brake release solenoid HS-25 is disabled so brake is applied
to drum shaft. Drum 3 pawl in solenoid HS-26 is enabled to
keep pawl applied to drum flange. Drum pump does not
stroke in response to control handle movement.
When drum 3 brake switch is placed in off - park position,
brake release solenoid HS-25 remains applied. Brakes
remain applied until Node-6 controller sends a 24 volt output
to release the brake. Node-6 controller sends a zero volt
output signal to drum pawl in solenoid HS-26 and a 24 volt
output to enable pawl out solenoid HS-27 to release pawl.
The drum circuit is active, waiting for a control handle
command.
Raising
See Figure 1-29 and Figure 1-31 for the following procedure.
When drum 3 control handle is moved back for raising, an
input voltage of 2.6 volts or more is sent to Node-1 controller.
Node-4 controller sends a 24 volt output to enable left travel
to drum 3 diverting solenoid HS-28. Node-3 controller sends
a variable zero to 24 volt output that is divided by a resistor
and applied to pump 2 EDC in the raising direction. Node-6
controller sends a variable zero to 24 volt output that is
divided by a resistor and applied to motor PCP. Node-1
controller checks that drum block-up limit switches are
closed and no system faults are present.
Pump EDC tilts swashplate in 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 3 brake release solenoid HS-25. Drum
brake solenoid shifts to block drain port and opens port to
low-pressure side of drum system to release brake from
drum shaft.
The pump EDC tilts swashplate in the raising direction as
hydraulic fluid flow is from pump port to motor port. Return
fluid is from motor outlet port to pump inlet port.
Node-3 controller output voltage to pump EDC and Node-6
controller output voltage to motor PCP is relative to control
handle movement. As control handle is moved back, an
output voltage increases the pump swashplate angle.
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
FIGURE 1-29
HS-25
HS-27
HS-28
Brake
Diverting
Valve
Motor
(PCP)
Pump
(EDC)
Pressure
Sender
Pawl
HS-26
16-1021
Accessory Pump
(Low-Pressure)

Manitowoc 16000 Specifications

General

Brand	Manitowoc
Model	16000
Category	Construction Equipment
Language	English