Toro Groundsmaster 5900 Series Service Manual page 118

Reverse Direction
Hydraulic System: Hydraulic Flow Diagrams
The traction circuit operates essentially the same in reverse low range as it does
in the forward direction. However, the flow through the circuit is reversed. Oil
flow from piston pump port B is directed to traction manifold port P2. Pump flow
is then routed in parallel to both halves of the front wheel motors through port
R of the motors. Flow exits the motor sections through motor ports A1 and A2.
Flow from motor port A1 returns to the piston pump through the traction manifold
P1 port and then is routed back to pump port A. Return flow from the front wheel
motor A2 port is routed to the opposite rear wheel motor (right front to left rear
through unshifted PD5 and PD2, left front to right rear through unshifted PD4
and PD3). Flow from the rear motors returns through unshifted traction manifold
valve PD1, manifold port P1 and to piston pump port A. Oil flow in reverse keeps
all wheel motors at their maximum displacement to allow a lower traction speed
along with CrossTrax TM
Operation of the traction manifold shuttle valve (SH), steering orifices (OR1 and
OR2), relief valve (RV1) and check valves (CV1 and CV2) is the same in reverse
low speed as it is in the forward direction.
4WD operation for enhanced traction.
Page 5–18 Groundsmaster ® 5900 & 5910
16227SL Rev B