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TMS800E SERVICE MANUAL UNDERCARRIAGE
Published 01-29-2014, Control # 496-00
NOTE: The park brake in the carrier cab must be set
before the outrigger controls will operate.
The outrigger extend/retract momentary switch located on
the right side console in the superstructure cab must be used
in conjunction with the outrigger selector switch to control the
operation of the stabilizer and extension cylinders. Push the
top of the switch to select the extend function or bottom of
switch to select the retract switch.
The integrated outrigger valve spool shifts allowing flow to
either the extend or retract line as applicable. If the top of the
switch is pushed down to extend, flow continues through the
open solenoid valve to the piston side of the cylinder. If the
stabilizer is to be extended, the flow first unseats the cylinder
check valve then extends the cylinder. The oil from the rod
end flows through the integrated outrigger valve, and then to
the reservoir.
When the bottom of the outrigger switch is pushed to retract
position, the flow through the selector valve is directed to the
rod side of the cylinder. The oil in the piston side flows
through the open solenoid back to the integrated outrigger
valve. If a stabilizer cylinder is to be retracted, then pilot
pressure from the pressurized retract line unseats the
cylinder check valve allowing oil to flow from the piston side
through the open solenoid valve to the integrated outrigger
valve. The integrated outrigger valve directs the flow to the
reservoir.
The front stabilizer functions similar to any of the other
outrigger cylinders. The front stabilizer will retract when the
outrigger extend/retract switch is positioned to the retract
position. After operating the main outrigger control, the
center front stabilizer must be reset before operating the
crane. A pressure switch is used to sense pressure in the
barrel end of the cylinder after extension. When the pressure
reaches 310.26 ± 1.38 bar (4500 ± 20 psi), the switch causes
the red center front stabilizer overloaded indicator to be
illuminated on the superstructure operator’s display and a
warning buzzer to sound. This alerts the operator that the
center stabilizer circuit senses over pressurization indicating
an overload condition. The inline relief valve prevents over
pressurization of the center front stabilizer cylinder as the
cylinder is being extended. The valve is installed in line
between the solenoid valve and the cylinder, and is set at
13.79 bar (200 psi).
Reference Only
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