Manitowoc 16000 Service And Maintenance Manual

Reference Only
Manitowoc Published 05-09-17, Control # 014-28 1-57
16000 SERVICE/MAINTENANCE MANUAL INTRODUCTION
1
Jacking Cylinders
See Figure 1-53 and Figure 1-54 in the flowing procedure.
There is one jacking cylinder on each corner of the
counterweight base. The jacking cylinders are for raising the
counterweight wheels off ground to allow wheeled
counterweight assembly to stand by itself when not attached
to crane, wheel positioning, or to aid in tire maintenance.
Struts must be pined to each jack cylinder to stabilize the
counterweight assembly when it is not attached to crane.
Each jacking cylinder has a counterbalance valve at each
cylinder port to provide smooth operation when operating.
Counterbalance valves lock cylinder in position and also
provide relief protection for the cylinder. The jacking three
position spool valves are motor spooled where both cylinder
ports and tank port of valve spool section are connected in
center position.
Each jacking cylinder has an end of travel sensor that stops
jacking cylinder travel at a preset position and sends an input
voltage signal to Node-1 controller. Each jacking cylinder
end of travel sensor is normally open. All jack end of travel
switches must be closed before the wheeled counterweight
assembly can travel or swing.
MAX-ER base level sensor indicates the counterweight base
roll and pitch to ± 4.5 degrees from zero and sends an input
voltage to Node-1 controller.
Power is available to hand-held wireless remote control
when, engine is running, MAX-ER function mode is selected,
and power button is pressed. Jacking cylinders can not be
extended/retracted until electrical cables and hydraulic lines
are connected between rear of crane and telescopic beam of
wheeled counterweight assembly.
When operating, the left travel handle can control the
operation of the jacking cylinders when travel is parked and a
MAX-ER chart is selected. Moving the left travel handle
forward enables all jacking cylinders down. Moving the left
travel handle back enables all jacking cylinders up. The left
travel jacking cylinder extend/retract is similar to the hand-
held wireless remote control operation described next.
Jack Cylinder(s) Extend
When selected jack or jack all switch is moved and held in
extend position, an input signal from wireless transmitter is
sent to a receiver on the crane. The receiver sends the input
signal to Node-1 controller. Node-7 sends a 24 volt output to
enable the selected jack cylinder solenoid (HS-74 in this
example) and shifts the valve to the extend position.
Node-3 controller also sends a variable zero to 24 voltage to
enable proportional relief solenoid HS-68 to provide
approximately 4,500 psi (310 bar) pressure to jack system.
Hydraulic pressure from accessory pump flows through
pressure control pilot valve, six bank manifold valve, and
enters free-flow check valve section of counterbalance
valve. Fluid pressure on piston end of selected jack cylinder
extends jack cylinder to raise the wheeled counterweight
base.
Hydraulic fluid from rod end of jack cylinder is blocked by
free-flow check valve section of counterbalance valve and
flow restraining section of relief valve preset for a relief
setting of approximately 2,000 psi (138 bar). Rod end
cylinder pressure opens restraining section of
counterbalance valve, allowing fluid to exit valve. Return
hydraulic fluid passes through six bank manifold valve before
returning to crane hydraulic tank through a return line.
When desired jack cylinder extension is reached, release
selected jack switch to lock jack cylinder(s) in position.
Hydraulic fluid at piston end of jack cylinder counterbalance
valve supports the weight and gravity force of the wheeled
counterweight assembly.
When selected jack switch is released, an input signal is sent
to Node-1 controller. Node-7 controller sends a zero volt
output to hydraulic solenoid HS-74 to return valve to center
position.
Node-3 sends a variable voltage output to accessory system
proportional relief solenoid HS-68 to provide approximately
400 psi (28 bar) system pressure.
Jack Cylinder(s) Retract
When selected jack or all switch is moved and held in retract
position, an input signal from wireless transmitter is sent to a
receiver on the crane. The receiver sends the input signal to
Node-1 controller. Node-7 sends a 24 volt output to enable
the selected jack cylinder solenoid (HS-75 in this example)
and shifts the valve to the retract position.
Node-3 controller also sends a variable zero to 24 voltage to
enable proportional relief solenoid HS-68 to provide
approximately 4,500 psi (310 bar) pressure to jack system.
DANGER
Tipping Hazard!
Wheeled counterweight assembly can tip:
• Extend and retract jacking cylinders slowly to
maintain counterweight base as level as possible.
• Do not extend jacking cylinders if wheeled
counterweight assembly is not attached to crane and
wheels are not at stand alone position.
• Make sure struts are pinned to jacking cylinders when
raising base with jacking cylinders.
• Read and understand counterweight jack procedure
before operating MAX-ER wireless remote control.

Manitowoc 16000 Specifications

General

Brand	Manitowoc
Model	16000
Category	Construction Equipment
Language	English