Cub-cadet P Series Manuel d'utilisateur télécharger pdf (Page 15)

10 P Series

Figures 10 represents a graphical schematic of the

P Series Pump with standard charge pump. Figure

10 provides a graphical illustration of the hydraulic

oil circuit.

The input shaft and pump cylinder block are turned

in one direction only by the engine/drive belt/pulley

combination or direct drive gear box.

The oil is drawn through an external lter by the

charge pump. The lter prevents contaminants

within the reservoir from entering into the charge

pump gerotor.

The charge pump supplies uid to keep the closed

loop pressurized, preventing cavitation and provid-

ing cooling oil ow for the system.

The charge relief valve is used to maintain charge

at a predetermined pressure.

Output of the system oil ow is controlled by the

direction and amount that the swashplate is

angled. As the pump pistons compress, they force

oil into one of two passageways (“A” or “B”) in the

system hydraulic circuit. Oil is supplied externally

under pressure to an external load, (e.g., a vehicle

wheel motor).

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 wheel motor.

Reversing the angle of the swashplate will reverse

the direction of the oil ow. During the operation

of the pump, uid is “lost” from the hydraulic loop

through leak paths designed into the product for

lubrication and cooling purposes (around pistons,

under the rotating cylinder block, etc.). This “lost”

uid returns to the reservoir through the case drain.

This uid must be made up in the loop. The charge

pump makes up this uid loss.

The makeup ow is controlled (or directed) by the

system check valves. The check valves are used

to direct makeup uid into the low pressure side

of the closed loop. Each check valve will either be

held open or closed, depending upon the direction

of the vehicle operation: Closed in a pressurized

system passage, open in a low pressure, “charged”

system passage.

Figure 10. P Series Pump With Standard Charge Pump

GRAPHICAL SCHEMATIC

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 135 136

Commentaires sur ces manuels

Pas de commentaire

Cub-cadet P Series Manuel d'utilisateur Page 15

Commentaires sur ces manuels