Toro Reelmaster 3100-D Service Manual page 94

Mow
Backlap
Hydraulic System: Hydraulic Flow Diagrams
The gear pump (P1) is directly coupled to the hydrostat which is driven by
the engine. Taking its suction directly from the hydraulic tank, the gear pump
supplies fluid flow to the manifold block and to the reel motors.
Solenoid valve (SV) is de−energized with the engine running when either the
reels on/off switch is OFF, the cutting units are up, or the transport/mow switch
is in TRANSPORT. SV by−passes flow from the reel motors directly to the
hydraulic reservoir.
Solenoid valve (SV) is energized with the engine running when the reels on/off
switch is ON, the cutting units are down, and the transport/mow switch is in
MOW. Flow is diverted to the reel motors.
Fluid flows from port (P1) across the logic cartridge valve. The logic cartridge
valve maintains a pressure differential of 5.5 bar (80 PSI) across the speed
control valve. Any excess flow above what the speed control valve is set
for, is by−passed to the reservoir through the logic cartridge valve. With the
backlapping valve in the mow position, fluid flows through the valve, out port
(M1), and to reel motors that are connected in series.
Fluid flows through the rear, right front, and then left front reel motors as it turns
the motors in the mow direction. The fluid then returns into manifold block port
(M2) and then to the hydraulic tank.
If cutting unit circuit pressure exceeds relief pressure of 207 bar (3000 PSI)
during deck motor operation, solenoid valve (SV) shifts to allow circuit pressure
relief.
Backlapping operation is the same as mowing operation, except for the position
of the backlap valve (MR). When the backlap valve (MR) is in the backlap
position, fluid flows through the left front, right front, and then rear reel motors.
Page 5–18 Reelmaster ® 3100-D/3105-D
20252SL Rev A