Toro 08162SL Model 30413 Groundsmaster 4100 D Service Manual

Traction Circuit: Transport (2WD)
The traction circuit piston pump is a variable displace-
ment pump  that is directly  coupled to  the engine fly-
wheel. Pushing the traction pedal engages a hydraulic
servo valve  which controls the  variable displacement
piston pump swash plate to create a flow of oil. This oil
isdirectedtothefrontwheelandrearaxlemotors.Oper-
ating pressure on the high pressure side of the closed
traction circuit loop is determined by the amount of load
developedatthefixeddisplacementwheelandaxlemo-
tors.  As the  load increases,  circuit  pressure can  in-
crease to  relief valve settings:  4000 PSI (274  bar) in
forward and 5000 PSI (343 bar) in reverse. If pressure
exceeds the  relief setting, oil  flows through  the relief
valve to the low pressure side of the closed loop traction
circuit. The traction circuit provides operation  in either
4WD (mow) or transport (2WD).
Forward Direction
With the transport/4WD switch in the transport position,
solenoid valve (SV) in the 4WD control manifold is ener-
gized. The solenoid valve spool shifts to direct charge
pressure  that shifts  the PD1  and  PD2 control  valve
spools. The shifted PD1 valve prevents hydraulic  flow
from the piston pump to the rear axle motor. With flow
blocked to the rear axle motor, all pump flow is directed
to the  front wheel  motors to allow  a higher  transport
speed in the forward direction.
Without flow  to the  rear axle motor,  the rotating  rear
wheels drive the axle motor so it acts like a pump. Inlet
oil to the axle motor is provided by a check valve that al-
lows charge oil into the rear axle motor circuit. Oil leav-
ing the axle motor enters the 4WD  control manifold at
port M2 and is directed back to the axle motor through
the shifted PD1 cartridge and manifold port M1. Toallow
forrearwheelloopcoolingwheninforwardtransportop-
eration, a small amount of oil exits through the shifted
PD1 and PD2 cartridges that returns to the reservoir.
Traction circuit pressure (forward and reverse) can be
measured at test ports on the sides of the machine.
The  traction  circuit  pump  and  motors  use  a  small
amount of hydraulic fluid for internal lubrication. Fluid is
designed to leak across traction pump and motor com-
ponents into the case drain. This leakage results in the
lossofhydraulicfluidfromtheclosedlooptractioncircuit
that must be replaced. The charge circuit is designed to
replace this traction circuit leakage.
Reverse Direction
The traction circuit operates essentially the same in re-
versetransport(2WD)asitdoesintheforwarddirection.
However, the flow through the circuit  is reversed. The
shifted solenoid valve (SV) and directional valves PD1
and PD2 in the 4WD manifold prevent oil flow from the
rear axle motor. Oil flow from the hydrostat is therefore
directed to only the front wheel motors. This  oil drives
the front wheel motors in the reverse direction and then
returns to the hydrostat. Oil circulation through the rear
axle motor loop is the same as in the transport (2WD)
forward direction.
The gear pump section that supplies oil to the steering
and lift/lower  circuits also  provides charge oil  for the
traction circuit. This gear pump is driven directly off the
tractionpump.Itprovidesaconstantsupplyofchargeoil
to the traction circuit to make up for oil that is lost due to
internal leakage in the traction pump and motors.
Charge pump flow is directed through the oil filter and to
the low pressure side of the closed loop traction circuit.
A filter bypass valve allows charge oil flow to the closed
loop if the filter becomes plugged. Charge pressure is li-
mited to 250 PSI (17 bar) by a relief valve located in the
oil filter manifold. Charge pressure can be measured at
the charge circuit pressure test port on the oil filter man-
ifold.
Groundsmaster 4100--D
Page 4 -- 13
Hydraulic System
Product Specification
CategoriesLawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals
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- 298 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)
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Publishertoro.com
Wikipedia's PageToro Company
CopyrightAttribution Non-commercial
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One thought on “Toro 08162SL Model 30413 Groundsmaster 4100 D Service Manual

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    mower about the yard. The US will be getting a revised 2011 Jeep Wrangler but the diesel option will not be offered in the United States.

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