Manitowoc 14000 Service Maintenance Manual

Reference Only
Manitowoc Published 09-05-14, Control # 226-02 1-43
14000 SERVICE MANUAL INTRODUCTION
1
Clutch/brake pedal can remain applied during normal
operation as clutch/brake pedal is disabled until the node-3
controller selects free fall.
Clutch/brake springs are hydraulically released by the clutch/
brake pedal and the node-3 controller. The clutch/brake shaft
and third planet gear carrier are free to rotate, allowing drum
to free fall around main drive shaft (Figure 1-23
). Clutch/
brake pedal pressure controls drum speed as the clutch/
brake proportional valve controls releasing spring pressure
to friction discs and outer plates of the clutch/brake.
Free Fall — Hoisting
See Figures 1-24 and 1-25.
The following description is for front drum while operating in
free fall. Operation of rear drum is the same, except for
different drum, brake, pawl and clutch/brake.
Front drum hoisting in free fall operates the same as full
power (See Drum 1 (Front Drum) System topic). When
hoisting the load, free fall clutch/brake is applied.
Begin applying front free fall drum clutch/brake pedal as
control handle is moved to neutral position. When control
handle neutral switch opens, an input signal to node-1
controller. Node-3 controller sends a zero output voltage to
disable drum 1 brake solenoid valve HS-1 and to apply drum
brake before pump de-strokes.
Free Fall — Lowering
See Figures 1-24 and 1-25.
When front drum brake is applied, node-3 controller sends a
24 volt output signal to shift free fall enable solenoid valve
HS-6, blocking flow to tank.
When the front clutch/brake pedal is released, an input
signal is sent to the node-1 controller. Node-3 controller
sends a variable 0 to 24 volt output signal to the front drum
clutch/brake proportional valve HS-2. Up to 3,000 psi (207
bar) of pressure pushes against piston to start compressing
clutch/brake springs to release the clutch/brake.
Hydraulic pressure to piston is in direct proportion to clutch/
brake pedal movement as controlled by node-1 and node-3
controllers. The clutch/brake proportional valve HS-2
pulsates on/off between brake and tank, depending on
command or back-pressure. Moving clutch/brake pedal fully
applies clutch/brake without slipping.
WARNING
Falling Load Hazard
When operating in free fall, load will lower uncontrolled if
front drum clutch/brake pedal is not applied.
Be ready to apply drum clutch/brake pedal so lowering
speed can be controlled and load can be stopped
immediately, when necessary.
WARNING
Falling Load Hazard
When operating in free fall, load will lower uncontrolled if
front drum clutch/brake pedal is not applied.
Be ready to apply front drum clutch/brake pedal so
lowering speed can be controlled and load can be
stopped immediately, when necessary.
CAUTION
Clutch/Brake Motor Damage
Do not move a drum handle in either direction from
neutral while a load is free falling. First stop the load with
drum clutch/brake pedal. Damage to clutch/brake and/or
motor drive system could occur.
Do not turn free fall off or turn off drum brake while a load
is free falling. Stop loads with clutch/brake pedal, then
turn free fall off or turn off drum brake.

Manitowoc 14000 Specifications

General

Brand	Manitowoc
Model	14000
Category	Construction Equipment
Language	English