Toro Groundsmaster 4300-D Service Manual page 83

PTO Engaged (continued)
Groundsmaster ® 4300-D
16226SL Rev C
creates a pressure increase at the logic cartridge that shifts the logic cartridge
and allows fluid return from the deck motors.
The maximum mow circuit pressure is limited at each deck manifold circuit by the
proportional relief valve (PRV1/PRV2). The deck relief valve pressure is 17,500
kPa (2,500 psi) for the rear cutting unit circuit and 24,100 kPa (3,500 psi) for the
front cutting unit circuit. Mow circuit pressure can be measured at port G1 (rear
cutting unit circuit) or G3 (front cutting unit circuit) of the deck control manifold.
The brake relief and logic cartridges control the stopping rate of the blades when
the proportional relief valves are de-energized as the PTO switch is turned O
or if the decks are raised; refer to
(page 4–22).
Mow Circuit Cutting Deck Blade Braking
Page 4–21 Hydraulic System: Hydraulic Flow Diagrams
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