Pto Circuit - Toro Groundsmaster 360 Service Manual

PTO Circuit

Hydraulic System: Hydraulic Flow Diagrams
The transmission of the Groundsmaster 360 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 (pulled up), 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 PTO driveshaft and the cutting deck. An orifice and accumulator in
the transmission prevent sudden engagement of the PTO.
The Groundsmaster 360 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 1,951 to 2,351 kPa (283 to 341 psi).
When the PTO switch is turned off (pushed down), 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. When
the transmission solenoid valve is de-energized, the hydraulic accumulator is
allowed to discharge stored hydraulic fluid back to the hydraulic tank.
WARNING
Releasing Pressure from the
4–5).
Page 4–26 Groundsmaster 360
16225SL Rev C