Toro Reelmaster 3100-D Service Manual page 100

Shift Sidewinder Right
Shift Sidewinder Left
Hydraulic System: Hydraulic Flow Diagrams
The gear pump (P2) is directly coupled to the hydrostat through gear pump
(P1). It supplies hydraulic pressure (charge pressure) for raising and lowering
the cutting units, operating the sidewinder unit, and replenishing the closed
loop traction circuit (charge pressure). The pump takes its suction directly from
the hydraulic tank.
During conditions of not lifting or lowering the cutting units, flow from the gear
pump is by−passed through the power steering valve, 2−spool valve, and
hydraulic manifold directly to the hydrostat and the charge relief valve. Flow then
returns to the hydraulic tank.
When the sidewinder is to be shifted right, the 2−spool valve is positioned by
moving the cutting unit shift lever to RIGHT. Flow is directed to the cap end of
the sidewinder cylinder. Hydraulic pressure against the cylinder piston moves
the rod causing the sidewinder cylinder to extend right. At the same time, the
piston pushes the hydraulic fluid out of the cylinder, back through the spool and
hydraulic manifold, and to the hydrostat. When the cutting unit shift lever is
released, spring action returns the valve to its original position and by−passes
flow back to the hydrostat and stopping cylinder movement. The cylinder
position is locked in place since there is no complete circuit of flow to or from
the sidewinder cylinder when the lever is released.
When the sidewinder is to be shifted left, the 2−spool valve is positioned by
moving the cutting unit shift lever to LEFT. Flow is directed to the rod end of the
sidewinder cylinder. Hydraulic pressure against the cylinder piston moves the
rod causing the sidewinder to retract left. At the same time, the piston pushes
the hydraulic fluid out of the cylinder, back through the spool and hydraulic
manifold, and to the hydrostat. When the cutting unit shift lever is released,
spring action returns the valve to its original position and by−passes flow back
to the hydrostat stopping cylinder movement. The cylinder position is locked in
place since there is no complete circuit of flow to or from the sidewinder cylinder
when the lever is released.
Page 5–24 Reelmaster ® 3100-D/3105-D
20252SL Rev A