Sidewinder Circuit
The gear pump (P2) is directly coupled to the hydrostat
through gear pump (P1). It supplies hydraulic pressure
(charge pressure) for operating the power steering sys-
tem, raising and lowering the cutting units, operating the
sidewinder unit, and maintaining 100 to 150 PSI (6.9 to
draulic 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
thevalvetoitsoriginalpositionandby--passesflowback
to the hydrostat and stopping cylinder movement. The
cylinderpositionislockedinplacesincethereisnocom-
plete circuit of flow to and from the sidewinder cylinder.
10.0
bar) to the low pressure side of the traction circuit.
The pump takes its suction from the hydraulic reservoir.
During conditions of not lifting or lowering the cutting
units,flow fromthegearpump isby--passedthroughthe
power steering valve, 2--spool lift/sidewinder valve, and
hydraulic manifold directly to the hydrostat and the
charge relief valve. Flow then returns to the hydraulic
tank.
Shift Sidewinder Left
When the sidewinder is to be shifted left, the 2--spool
valve is positioned by moving the cutting unit shift lever
toLEFT.Flowisdirectedtotherodendofthesidewinder
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 hy-
drostat stopping cylinder movement. The cylinder posi-
tion is locked in place.
Shift Sidewinder Right
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 side-
winder cylinder. Hydraulic pressure against the cylinder
piston moves the rod causing the sidewinder cylinder to
extend right. Atthesame time,thepistonpushes thehy-
Groundsmaster 3500--D
Page 4 -- 19
Hydraulic System (Rev. D)
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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| Tags | Toro Groundsmaster 3500 D |
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| Language | English |
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