Theory of Operation
In the off (L) position, shut-off lever pulled rearward to
The pilot shut-off valve is a manual-operated,
the LOCK position, pilot oil to the controllers and
two-position, three-way rotary valve. The shut-off valve
solenoid valve manifold is blocked and the pilot oil now
is rotated by pushing or pulling the pilot shut-off lever.
flows to the flow regulator valve (H). Pilot oil that flows
The valve is located under the cab.
to the flow regulator valve when shut-off valve is
locked is part of the warm-up circuit. The inlet ports for
In the on (G) position, shut-off lever pushed forward to
the controllers are open to hydraulic oil tank through
the UNLOCK position, pilot oil flows to inlet ports of
the shut-off valve and solenoid valve manifold.
the pilot controllers, propel pilot controller, and
solenoid valve manifold. Return oil from the controllers
flows to the shut-off valve and then through the
solenoid valve manifold and back to the hydraulic oil