Toro 05145SL Rev B Groundsmaster 3505 D Service Manual

Steering Circuit
Atwosectiongearpumpisdirectlycoupledtothethehy-
drostat which is driven by the engine. Gear pump sec-
tion  (P2)  supplies  hydraulic  flow  for   operating  the
steering system, raising and lowering the cutting units
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
reservoir.
Left Turn
When a left turn is  made with the engine running, the
turning of the steering wheel positions the steering con-
trol valve so that flow goes through the top of the valve.
Flowenteringthesteeringcontrol   valveattheIN(P)port
goes through the spool and is routed to two places. As
in a right turn, most of the flow through the valve is by--
passed out the AUX (E) port back through the lift control
and to the hydrostat (charge). Also like a right turn, the
remainder of the flow is drawn through rotary meter (V1)
but goes out port (L) to the steering cylinder.  Flow ex-
tends the  steering cylinder  piston for a  left turn.  The
rotary meter (V1) ensures that the oil flow to the cylinder
is proportional to the amount of the turning on the steer-
ing wheel. Fluid leaving the steering cylinder flows back
through the steering control valve then through the OUT
(T) port and to the hydrostat (charge).
With the engine running and the steering control valve
in the centered position, flow enters the steering control
valve at the  IN (P) port  and goes through the  control
valve, by--passing the  rotary meter (V1)  and steering
cylinder. Flow leaves the control valve through the AUX
(E) port to be available for the lift circuit and then to the
hydrostat (charge).
Right Turn
When a right turn is made with the engine running, the
turning of the steering wheel positions the control valve
so that flow goes through the bottom of the valve. Flow
enteringthesteeringcontrolvalveattheIN(P)portgoes
through thevalve andisroutedtotwoplaces.First,most
of the flow through the valve is by--passed out the AUX
(E) port back through the lift control valve to the hydros-
tat. Second, the remainder of the flow is drawn through
the rotary meter (V1) and out port (R) to the steering cyl-
inder.Flow tothe steering cylinder retracts the piston for
a right turn. The rotary meter (V1) ensures  that the oil
flow to the cylinder is proportional to the amount of the
turning on the steering wheel. Fluid leaving the steering
cylinder flows back  through the steering control valve
then through  the  OUT (T)  port and  to the  hydrostat
(charge).
The steering control valve returns to the neutral position
when turning is complete.
The steering control valve returns to the neutral position
when turning is complete.
Groundsmaster 3505--D
Page 4 -- 17
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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