Toro 10176SL Service Manual Models 30448 30446 Groundsmaster 4000 4010 D D Preface

Steering Circuit
A four section gear pump is coupled to the piston (trac-
tion) pump. The  third gear pump section supplies  hy-
draulic flow to  both the steering and lift/lower circuits.
Hydraulic flow from this pump section is delivered to the
two circuits through a proportional flow divider that is lo-
cated in the fan drive manifold. This  flow divider splits
pump flow  approximately 50% for  the steering circuit
and 50% for the lift/lower circuit.
(V1) and out the L port. Pressure retracts the steering
cylinder piston for a left turn. The rotary meter ensures
that the  oil flow  to the  cylinder is  proportional to the
amount of the turning on the steering wheel. Fluid leav-
ing the cylinder flows back through the spool valve then
through the T port and to the hydraulic reservoir.
The steering control valve returns to the neutral position
when turning is completed.
Steering circuit pressure is limited to 1350 PSI (93 bar)
byareliefvalvelocated   inthesteeringcontrol  valve.Cir-
cuit pressure can be measured at a test port in the hy-
draulic supply tube.
Right Turn
When a right turn is made with the engine running, the
turningofthesteeringwheelpositionsthespoolvalveso
that flow goes through the bottom of the spool. Flow en-
tering  the steering  control  valve at  the  P port  goes
through the spool and is routed to two places. As in aleft
turn,mostoftheflow   through the valve is by--passedout
the PB port back to the oil filter and traction charge cir-
cuit. Also like  a left turn,  the remainder of  the flow is
drawn through rotary  meter (V1) but goes out  port R.
Pressure extends the steering cylinder piston for a right
turn. The rotary meter ensures that the oil flow to the cyl-
inder is proportional to the amount of the turning on the
steering wheel.  Fluid leaving  the cylinder  flows back
through the spool valve then through the T port and to
the hydraulic reservoir.
With the steering wheel in the neutral position and the
engine running, flow enters the steering control valve at
the P port and goes through the steering control spool
valve, by--passing the  rotary meter (V1)  and steering
cylinder. Flow leaves the control valve through the PB
port to the oil filter and traction charge circuit.
Left Turn
When a left turn is  made with the engine running, the
turningofthesteeringwheelpositionsthespoolvalveso
thatflowgoesthroughthetopofthespool.Flowentering
the steering control valve at the P port goes through the
spool and is routed to two places. First, most of the flow
through the valve is by--passed out the PB port back to
the oil filter and traction charge circuit. Second, the re-
mainder of the flow is  drawn through the rotary meter
The steering control valve returns to the neutral position
when turning is completed.
STEERING CYLINDER
STEERING CYLINDER
PISTON MOVEMENT
STEERING CYLINDER
PISTON MOVEMENT
NO PISTON MOVEMENT
R
L
R
L
R
L
1
350
1350
PSI
1350
PSI
PSI
T
PB
P
T
PB
P
T
PB
P
STEERING
CONTROL
STEERING
CONTROL
STEERING
CONTROL
NEUTRAL POSITION
LEFT TURN
RIGHT TURN
Figure 14
Groundsmaster 4000--D/4010--D
Page 4 -- 23
Hydraulic System
Product Specification
CategoriesLawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals
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- 340 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)
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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