Toro 03113SL Rev E Greensmaster 3150 Service Manual

Traction Forward and Reverse
Forward
Reverse
The hydrostat is driven directly by the engine. The trac-
tion circuit of the hydraulic system acts essentially as a
closed loop. Taking its suction  directly from the return
side of the wheel motors of the traction circuit, the hy-
drostat supplies oil flow to the wheel motors through the
supply side of the traction circuit.
The traction circuit operates essentially the same in re-
verse as it does in the forward direction. However, the
flow through the circuit is reversed.
With the engine running and traction pedal in the neutral
position, the hydrostat supplies no flow tothe wheel mo-
tors. When the traction pedal is pressed to the reverse
position, the linkage from the pedal positions the swash
plate in the hydrostat so oil flows out the bottom port of
the pump. Oil  flow out of the  bottom port goes to  the
wheel motors and turns them in the reverse direction.
With the engine running and traction pedal in the neutral
position, the hydrostat supplies no flow tothe wheel mo-
tors. When the traction pedal is pressed to the forward
position, the linkage from the pedal positions the swash
plate in the hydrostat so oil flows out the top port of the
pump. Oil flow out of the top port goes to the wheel mo-
tors and turns them in the forward direction.
Oil flowing outofthewheel motors returns tothetopport
ofthe hydrostat and iscontinuously pumped outthebot-
tom port.
Oil flowing out of the wheel motors returns to the bottom
portofthehydrostat  andis continuously pumped outthe
top port.
Thecharge circuitfunctions thesame  in reverse as itdid
in the forward direction.
Traction Circuit Cooling
Hydraulic oil is supplied to the traction  circuit from the
gear pump (P2) though the steering  control valve and
back through thecharge circuitcheck valves. This oilre-
places oil  losses from  flow through the  internal case
drain, internal bleed valve, and small amounts of leak-
age.  Charge  circuit  pressure  is  maintained  by  the
charge relief valve (R4) that is attached to the hydrostat
back plate.
The traction circuit is cooled by a bleed off circuit in the
hydrostat.Thebleedoffcircuitincludesaninternalbleed
valve which allows about 1 gpm of hydraulic oil to pass
from the reverse side of  the hydrostat while operating
the traction  unit in the  forward direction. The  internal
bleed valve closes when operating the traction in the re-
verse direction.
Note:
The bleed valve threads into the hydrostat back
plate. Access to the bleed valve requires removal of the
back plate from the hydrostat.
Note:
While operating the traction unit in the reverse
direction  under light  loads,  a slight  surge in  ground
speed may be experienced.
Greensmaster 3150
Page 4 -- 11
Hydraulic System (Rev. E)
Product Specification
CategoriesLawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals
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- 306 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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Toro 03113SL Rev E Greensmaster 3150 Service Manual SKU UPC Model
kurt on May 29, 2014.

Safety switches not working


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