Jump to content

Unofficial Home of Old Simplicity & Allis-Chalmers Garden Tractors

  • Sign in to follow this  

    Page 2



    The inline piston type pump shown in (Fig. 3) has a series of pistons arranged in a circular pattern within a cylinder block. The engines rotary motion is transferred to the cylinder block by the shaft. The ends of the pistons contact a circular plate held at an angle. As the cylinder block rotates, the pistons are pushed into their bores, where they pressurize oil in the cylinder. The pressurized oil flows through passages from the ends of the cylinders to a hydraulic motor.

    Click for a closer view

    Inline piston motors (Fig. 4) are constructed like the pump, and in many instances use identical parts. Oil passages at the ends of the cylinders transport the pressurized oil to the
    ends of the motor pistons.

      The opposite ends of the pistons contact a stationary plate fixed at an angle. The pressure in the cylinder causes the piston to slide across the angled face resulting in movement of the cylinder   block. The rotational energy is transmitted through the motor housing by a drive shaft to move the tractor.

    During the second half of the pump rotation, the pistons withdrawing into their cylinders create a negative pressure (or vacuum) which allows the oil which is not under pressure during the second half of the motor rotation, to return to the cylinder. In effect, oil is constantly flowing from pump to motor under positive pressure, and returning from motor to pump under negative pressure.

    Click for a closer view

    Click for a closer view

    [Source: Simplicity publication, Hydraulic Systems Training Information, #840172, Principles and Operation of Tractor Hydraulic Systems]

      Report Post
    Sign in to follow this  

    User Feedback

    Recommended Comments

    There are no comments to display.

    Create an account or sign in to comment

    You need to be a member in order to leave a comment

    Create an account

    Sign up for a new account in our community. It's easy!

    Register a new account

    Sign in

    Already have an account? Sign in here.

    Sign In Now