Manitowoc MLC300 Service And Maintenance Manual

Reference Only
Manitowoc Published 11-22-17, Control # 257-02 8-15
MLC300 SERVICE/MAINTENANCE MANUAL UNDERCARRIAGE
8
CARBODY TRACK TENSION CYLINDERS
See Figure 8-6 and Figure 8-8 for the following descriptions.
The crawler track tension cylinders are controlled by the
setup remote.
Setup Remote Control
The setup remote control communicates with the CCM-10
control module via the controller area network bus (CAN
Bus). The crane control modules use the CAN Bus to
communicate with each other.
To operate the setup remote, it must be turned on as
instructed in the MLC300 Operator Manual.
Neutral
When the setup remote is not transmitting:
• Pump 3 hydraulic flow through system B (right valve
assembly) decreases.
• The isolation valve B shifts to neutral to block pump flow
to the crawler track tension solenoid valves.
• The crawler track tension solenoid valves shift to neutral
to block pump flow to the crawler track tension cylinders.
• The counterbalance valves lock the crawler track
tension cylinders in position.
Retract
When a retract command is initiated by the setup remote, the
setup remote receiver communicates the retract command
to the CCM-10 and IOC30 control modules via CAN Bus C.
The following then occurs:
• The CCM-10 control module increases the pulse-width
modulation (PWM) current to pump 3 to increase system
B hydraulic flow.
• The IOLC30 control module sends 24 V
DC
to the side A
solenoid on the system B isolation valve, energizing the
solenoid. The valve spool shifts to a position that routes
hydraulic fluid to the crawler track tension solenoid
valves.
• The CCM-10 control module relays the retract command
to the CCMB11 control module via CAN Bus B. The
CCMB11 control module then sends 24 V
DC
to the
corresponding solenoid on the selected crawler track
tension valve, energizing the solenoid. The valve spool
shifts to a position that routes hydraulic fluid to the rod
end of the crawler track tension cylinder.
• Fluid flows into the rod end of the cylinder. At the same
time, pilot pressure opens the counterbalance valve at
the barrel end of the cylinder. As hydraulic fluid fills the
rod end of the cylinder, the rod retracts. This action
forces hydraulic fluid out of the barrel end of the cylinder,
through the open counterbalance valve, and back to the
tank.
Extend
When an extend command is initiated by the setup remote,
the setup remote receiver communicates the retract
command to the CCM-10 and IOC30 control modules via
CAN Bus C. The following then occurs:
• The CCM-10 control module increases the PWM current
to pump 3 to increase system B hydraulic flow.
• The IOLC30 control module sends 24 V
DC
to the side A
solenoid on the system B isolation valve, energizing the
solenoid. The valve spool shifts to a position that routes
hydraulic fluid to the crawler track tension solenoid
valves.
• The CCM-10 control module relays the extend
command to the CCMB11 control module via CAN
Bus B. The CCMB11 control module then sends 24 V
DC
to the corresponding solenoid on the selected crawler
track tension valve, energizing the solenoid. The valve
spool shifts to a position that routes hydraulic fluid to the
counterbalance valve at the barrel end of the crawler
track tension cylinder.
• At the counterbalance valve, hydraulic fluid flows
through the barrel end check valve and into the barrel
end of the cylinder. As hydraulic fluid fills the barrel end
of the cylinder, the rod extends. This action forces
hydraulic fluid out the rod end of the cylinder, through
the open crawler track tension valve, and back to the
tank.

Manitowoc MLC300 Specifications

General

Brand	Manitowoc
Model	MLC300
Category	Construction Equipment
Language	English