Toro Reelmaster 3100-D Service Manual page 92

Traction Circuit Cooling
Hydraulic System: Hydraulic Flow Diagrams
The traction circuit is cooled by a bleed off circuit in the piston pump. The piston
pump includes an internal bleed valve which allows a small amount of hydraulic
fluid to pass from the return side of the pump while operating the traction unit
in the forward direction. The charge circuit replenishes fluid that is bled from
the traction circuit by the bleed valve.
When operating the traction circuit in the reverse direction, the bleed valve
closes once reverse pressure reaches 13.8 to 20.6 bar (200 to 300 PSI) to
allow normal reverse operation.
Note: The bleed valve threads into the piston pump back plate. Access to the
bleed valve requires removal of the back plate from the piston pump.
Page 5–16 Reelmaster ® 3100-D/3105-D
20252SL Rev A