Toro 05145SL Rev B Groundsmaster 3505 D Service Manual

Lift Circuit (Raise)
Atwosectiongearpumpisdirectlycoupledtothethehy-
drostat which is driven by the engine. Gear pump sec-
tion (P2) supplies hydraulic flow for raising and lowering
the  cutting units,  operating the  steering  system and
maintaining 100 to 150 PSI (6.9 to 10.3 bar) to the low
pressure side of the traction circuit (charge). The pump
section (P2) takes its suction from the hydraulic reser-
voir.
When the cutting units are to be raised,  the lift control
valve is  positioned by  moving the lift  control lever  to
RAISE. Flow is directed to the 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 block to the hydrostat (charge).
During conditions of not lifting or lowering cutting units,
flow from the gear pump (P2) is by--passed through the
steering control  valve, lift control  valve and hydraulic
manifold directly to the hydrostat and the charge relief
valve. Flow then returns to the hydraulic tank.
When  the lift  control  lever is  released  from RAISE,
springactionreturns  thevalvetoitsoriginal   position and
by--passesflowbacktothehydrostat(charge),stopping
lift cylinder movement. The cylinder position is locked in
place by the load holding checks in the lift control valve.
Groundsmaster 3505--D
Page 4 -- 13
Hydraulic System
Product Specification
CategoriesLawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals
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- 210 pages
Document TypeService Manual
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)
Canada 1-888-225-4886 USA 1-888-384-9939, Lawn Mower
Document File TypePDF
Publishertoro.com
Wikipedia's PageToro Company
CopyrightAttribution Non-commercial
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