Dixon ZTR 4515B Reparaturanleitung PDF herunterladen (Seite 7)

310-2400/2600 IZT

HYDRAULIC SCHEMATIC

Figure 2 provides an illustration of the hydrau-

lic oil circuits. The oil supply for the hydraulic

system of the 310-2400 IZT

and charged 310-

2600 IZT is also utilized for lubricating the

components of the final drive assembly.

The input shaft and pump cylinder block are

turned in one direction only by the engine/drive

belt/pulley combination. Output of the oil flow is

controlled by the direction and amount that the

variable swashplate is angled. As the pump

pistons compress they force the oil to flow

through one of two passageways (forward or

reverse) in the center section to the motor

cylinder block and motor shaft. Since the motor

has a fixed displacement angle it is forced to

turn with the flow of oil. As the angle of the

pump swashplate is increased the amount of

oil being pumped will increase and cause a

higher speed output of the motor. Reversing

the angle of the swashplate will reverse the

direction of oil flow.

During the operation of the transaxle, fluid is

“lost” from the hydraulic loop through leak

paths designed into the product for lubrication

purposes (around pistons, under the rotating

cylinder blocks, etc.). This “lost” fluid returns to

the transaxle housing, then is pulled back into

one of the check valves depending upon the

direction of vehicle operation. All of this oil

must pass through an internal filter.

Oil is forced through the filter by low inlet pres-

sure only on the 310-2400, but is pulled by a

charge pump circuit on the 310-2600.

The motor cylinder block mounts onto a

splined motor shaft which drives the gear train.

A charge pump is included on the IZT to

supply this makeup flow. The make up flow is

controlled (or directed) by the check valves.

Each check valve will either be held opened or

closed (depending upon the direction of

vehicle operation) by the system operating

pressure (closed) or by charge pressure

(open) from the charge pump.

The charge pump maintains a continuous flow

of oil as long as the input shaft is turning. All of

the oil being pulled into the charge pump first

must pass through an internal filter. Any oil not

needed by the transmission for make up flow is

discharged through the charge relief valve.

The charge relief valve maintains the charge

pressure at no more than 40 PSI (2.76 bar).

The bypass feature in the 310-2600 has a

mechanical lever which lifts the motor block off

of the center section running surface, allowing

any oil flowing from the pump block to be

discharged into the housing without turning the

motor.

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