De-stroking dual hydrostatic pump

Details De-stroking dual hydrostatic pump De-stroking dual hydrostatic pump

2008-04-08

2008-04-08

Leslie, Michael (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

C060S391000, C060S486000

Reexamination Certificate

active

07353651

ABSTRACT:
A zero turning radius mower has a dual hydrostatic pump with right and left pump arms. A linkage between the pump arms and a pair of control levers destrokes both sides of the pump simultaneously if engine speed drops below a specified value. The linkage allows each pump arm to have a first stroke range if the engine powering the pump is above the specified value, and a second smaller stroke range if the engine powering the pump is below the specified value.

REFERENCES:
patent: 3459273 (1969-08-01), Leinhauser et al.
patent: 3500633 (1970-03-01), Livezey
patent: 3823650 (1974-07-01), Ring et al.
patent: 3898811 (1975-08-01), Seaberg
patent: 4589249 (1986-05-01), Walker et al.
patent: 6161637 (2000-12-01), Decker et al.
patent: 6935106 (2005-08-01), Korthals

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