20
Hydraulic Systems
Components
Let’s look at the components that make up a complete hydrostatic drive system.
The pump consists of the following components:
Piston Group Assembly
Piston group assembly
This rotating piston group is mounted to the input
shaft and is driven by the engine. It consists of a
piston block with numerous precision machined
bores which house the pump pistons. The small
pump pistons consist of the piston and the piston
slipper. The slipper is usually a brass or aluminum
component which is connected to the piston and
moves the pistons when the pump is operating.
Swash plate
Swash Plate
The piston slippers pivot and slide against a
hardened washer called a thrust washer. The thrust
washer is located in the swash plate. The swash
plate pivots on two support pins and controls the
pump output. As the operator moved the traction
control pedal to increase travel speed the swash
plate angle increases.
Piston Group Operation
As the piston group spins the pistons are moved in
and out of their bores and they pump oil. As we saw
in the previous slides the quantity of the oil being
pumped is controlled by the angle of the swash plate.
As long as the swash plate is kept in the neutral
position, no oil will be pumped. As the operator
moves the traction control pedal the angle of the
swash plate increases, this in turn increases the
piston travel. As the piston travel increases the
amount of oil pumped increases and the travel speed
changes.
Toro University Technical Training
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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