Toro 04130SL Rev C Service Manual Multi Pro 5700 D Preface Publication

Hydraulic Flow Circuits
Traction Circuit
The traction circuit piston pump is  a variable displace•
ment pump  that is  directly coupled  to the  engine fly•
wheel. Pushing the top of the traction pedal rotates the
pump swash plate to create a flow of oil for forward ma•
chine  movement. Pushing  the bottom  of  the traction
pedal rotates the pump swash plate to cause oil flow for
reverse machine movement. This  oil is directed to the
rear wheel motors. Operating pressure on the high pres•
sure side of the closed traction circuit loop is determined
by the amount of load developed at the fixed displace•
ment wheel motors. As the load increases, circuit pres•
sure can increase  to relief valve settings: 4000  PSI in
either forward or reverse. If pressure exceeds the relief
setting, oil flows through the relief valve to the low pres•
sure side of the closed loop circuit.
The  piston (traction)  pump  and wheel  motors use  a
small amount of hydraulic oil for internal lubrication. Oil
is designed to leak across pump and motor parts into the
case drain. This leakage results in the loss of hydraulic
oil from the closed loop traction circuit that must be re•
placed.
The piston (traction) pump incorporates a charge pump
that provides make–up  oil for the  traction circuit. This
gerotor gear pump  is driven by the  piston pump drive
shaft. It provides a constant supply of charge oil to the
traction circuit to make up for oil that is lost due to inter•
nal leakage in the piston pump and wheel motors.
Charge pump flow is directed through the oil filter and to
the low pressure side of the closed loop traction circuit.
Pressure in the charge circuit is limited by a relief valve
located in the charge plate adapter on the rear of the pis•
ton pump. Charge pump pressure can be measured at
the auxiliary test port on the side of the piston pump.
Traction circuit  pressure  (forward or  reverse) can  be
measured by installing a tee  fitting and gauge into the
traction system hydraulic lines.
Multi Pro 5700–D
Page 4 – 9
Hydraulic System
Product Specification
CategoriesLawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals
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- 212 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
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Wikipedia's PageToro Company
CopyrightAttribution Non-commercial
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