Hydraulic Systems
21
Charge pump
Charge Pump
While the transmission is in operation there is a
constant loss of oil (by design) within the
components of the pump and motor. For example,
holes in the end of each piston allow a small amount
of oil to form a cushion between the slipper’s face
and the thrust washer. This oil must be continuously
replenished. Built in to the system is pump called a
charge pump. This pump can be a gear pump, or a
gerotor pump. Both of these pumps are fixed
displacement. Fixed displacement means that the
pump’s output is fixed by the RPM of the engine. It
cannot be varied except by increasing or decreasing
the speed of the engine. Excessive oil not required
by the drive circuit opens the charge relief valve and
flows back to the reservoir.
Charge Circuit
Oil is lost during use through designed in leakage areas.
•
•
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Replenishes lost oil used for:
Cooling
Lubrication
One piston is shown here illustrate the principle that
the drive pressure increases so does the lubrication
pressure for the piston slipper and swash plate
surface.
Hydrostatic Lubrication
•
As the drive pressure increases so does
the lubrication pressure
Drive
Pressure
Lubrication
Pressure
Piston
Toro University Technical Training
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
| Tags | Toro 09169SL |
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| Document Type | Catalog |
| Language | English |
| Product Brand | Toro. Customer Service Representatives are available by phone:
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| Document File Type | |
| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
| Copyright | Attribution Non-commercial |
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