Toro 05145SL Rev B Groundsmaster 3505 D Service Manual

Lift Circuit (Lower)
Circuit operation for lowering the cutting units is similar
to raising them. However, pressure is relieved from the
lift cylinders and this  action allows the cutting units to
lower.
When the lift control lever is released, spring action re-
turns the  valve to its original  position and by--passes
flow back to the hydrostat (charge). The pilot valve re-
mains shifted to allow the lift cylinders to float until the
lift control valve is moved to the raise position.
During conditions of not lifting or lowering cutting units,
flow from  gear pump  (P2) is  by--passed through  the
steering control  valve, lift control  valve and hydraulic
manifold directly to thehydrostat (charge). Flow thenre-
turns to gear pump (P1) inlet.
The logic  cartridge valve (LC1)  in the manifold  block
maintains 250 PSI (17.2 bar) back pressure  on the lift
cylinders. This counterbalance pressure transfers cut-
ting unit weight to the machine to improve traction.
When the cutting units are to be lowered, the lift control
valve is  positioned by  moving the lift  control lever  to
LOWER. Pressure from gear pump (P2) is used to shift
thepilotvalveinthecontrolvalve.Thisshiftedpilotvalve
allows hydraulic pressure to relieve from the cap end of
the lift cylinders. Flow from the cap end of the lift cylin-
ders causes the cutting units to lower. At the same time,
the fluid relieved from  the cap end of the lift  cylinders
goes into the rod end of the cylinders and back through
the hydraulic manifold block to the hydrostat (charge).
Groundsmaster 3505--D
Page 4 -- 15
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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