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Published 01-14-2021 Control # 707-01
CARRIER
TMS9000-2 SERVICE MANUAL
on the right hand side console. There is also a control panel
on either side of the crane behind the front outriggers.
A sight bubble level is mounted on the right side console in
the cab and on each of the side control panels. The sight
bubble level provides the operator with a visual indication of
crane level attitude.
Theory Of Operation
When the outrigger extension cylinder is activated, it extends
or retracts the outrigger beam within the outrigger box. The
jack cylinder is mounted to the end of the beam. The jack
cylinder applies force to the outrigger beam vertically. This
sequence of events provides for lifting and stabilizing the
crane for operation.
The appropriate Extension/Jack Switch must be depressed
before the Outrigger Extend/Retract Switch is pressed.
Depressing one of the outrigger selector switches causes
that solenoid valve (located on the integrated outrigger
valve) to open. As the selector switch is moved, the selector
valve shifts, allowing flow to either the extend or retract line,
as applicable. If the selector switch is in the EXTEND
position, the flow continues through the open solenoid valve
to the barrel side of the cylinder. If a jack is to be extended,
the flow first unseats the check valve then extends the
cylinder. The oil from the rod end flows to the selector valve
and through the swing bank on the way to the reservoir.
When the selector switch is in the RETRACT position, the
flow through the selector valve is to the rod side of the
cylinder. The oil in the barrel side flows through the open
solenoid back to the selector valve and through the swing
bank on the way to the reservoir.
The front jack functions similar to any of the other outrigger
cylinders. A pressure switch is used to sense pressure in the
barrel end of the cylinder after extension. When the pressure
reaches 31,028 kPa (4500 psi), the switch causes a red light
to be illuminated on the superstructure front console. This
alerts the operator that the center jack is approaching an
overloaded condition.
The in line relief valve prevents over pressurization of the
center front jack cylinder. The valve is installed in line
between the solenoid valve and the cylinder, and is set at
1379 kPa (200 psi).
Maintenance
For troubleshooting and maintenance, please refer to the
symptoms, causes and solutions on the next few pages.
Fo
r
Reference
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