Pto Circuit - Toro Groundsmaster 7210 Service Manual

PTO Circuit

Hydraulic System: Hydraulic Schematics
The transmission of the Groundsmaster 7210 machine consists of a hydraulic,
multi-plate clutch that is used to engage the PTO. The hydraulic flow for the PTO
clutch engagement is provided by the transmission-charge pump.
When the PTO switch is turned on, the transmission solenoid valve is energized
to allow the hydraulic flow to engage the PTO clutch. As the PTO clutch engages,
an integral PTO brake is released at the same time to allow the rotation of the
driveshaft and cutting deck (or implement). An orifice and accumulator in the
transmission prevent sudden engagement of the PTO.
The Groundsmaster 7210 machine has a hydraulic accumulator built
into the transmission that stores energy by compressing a spring.
This pressure must be released before disconnecting or doing any
work on the hydraulic system; refer to
Hydraulic System (page
The pressure to the PTO clutch is limited by the pressure valve in the
transmission. The pressure-valve setting is 1,930 to 2,340 kPa (280 to 340 psi).
When the PTO switch is turned off, the transmission solenoid valve is
de-energized and the PTO clutch is disengaged. The integral PTO brake
is applied to control the stopping rate of the driveshaft and cutting deck (or
implement).
WARNING
Releasing Pressure from the
4–11).
Page 4–22 Groundsmaster 7210
16222SL Rev C