Toro 01088SL Rev F Service Manual Groundsmaster 3500 D Preface Publication

Lift Circuit (Up)
Raise Cutting Units
When the  cutting units are  to be  raised, the 2--spool
valve is positioned by moving the cutting unit shift lever
to RAISE. Flow is directed to cap ends of the lift cylin-
ders. Hydraulic  pressure against  the cylinder pistons
moves their shafts causing the cutting units to raise. At
the same time, the pistons push the hydraulic fluid out
of the lift cylinders and back through the hydraulic man-
ifold to the hydrostat.
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
10.0
bar) to the low pressure side of the traction circuit.
The pump takes its suction from the hydraulic reservoir.
When the cutting unit shift lever is released, spring ac-
tion returns  the valve  to its original  position and  by--
passes flow back to the hydrostat stopping lift cylinder
movement. The cylinder position is locked  in place by
the load holding checks in the lift control valve.
During conditions of not lifting or lowering cutting units,
flow from the gear pump (P2) is by--passed through the
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.
Groundsmaster 3500--D
Page 4 -- 15
Hydraulic System (Rev. D)
Product Specification
CategoriesLawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals
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- 256 pages
Document TypeCatalog
LanguageEnglish
Product BrandToro. Customer Service Representatives are available by phone: Monday - Friday 7:30 a.m. to 9:00 p.m. (CDT) - Saturday 8:00 a.m. to 8:00 p.m. (CDT) - Sunday 10:00 a.m. to 8:00 p.m. (CDT)
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