Toro Groundmaster 31900, Service Manual

Page: 107 / 355

Auxiliary Valve Circuit (Optional) (continued)
When the auxiliary valve control switch is in the idle position, the valve allows
hydraulic fluid to pass through the auxiliary valve manifold, out port P2, and on to
the main hydraulic manifold. When the auxiliary valve control switch is set to the
left position, solenoid S1 is energized and fluid flow is directed to the A port of
the auxiliary valve manifold (male quick disconnect fitting). When the auxiliary
valve control switch is set to the right position, solenoid S2 is energized and
fluid flow is directed to the B port of the auxiliary valve manifold (female quick
disconnect fitting).
When the hydraulic component controlled by the auxiliary valve reaches the end
of its stroke, or if the component is prevented from moving, the relief valve (R4)
in the steering control valve opens and directs the hydraulic flow through the
main manifold and back to the gear pump (P2) until the auxiliary valve control
switch is released. The auxiliary valve circuit pressure is limited to 7,000 to
7,500 kPa (1,015 to 1,088 psi).
Groundsmaster ® 3200, 3300 and 3310 Page 5–21 Hydraulic System: Hydraulic Flow Diagrams
19240SL Rev A