Motor vehicles – Steering by driving – Independently operable drive motors
Patent
1984-08-30
1986-11-25
Love, John J.
Motor vehicles
Steering by driving
Independently operable drive motors
180306, B62D 1102
Patent
active
046243330
ABSTRACT:
An improved method and apparatus for the cold weather startup of a hydrostatic transmission in a skid-steer loader is disclosed wherein the flow of hydraulic fluid is directed through the hydraulic system for operating the work implement to heat up the hydraulic fluid before being directed into the hydrostatic transmission prior to engaging the drive to the transmission. By disconnecting the drive between the engine and the hydrostatic transmission, the fluid in the hydrostatic transmission can be warmed before engaging the drive to reduce the startup problems due to inherent resistances of cold hydrostatic transmissions. Utilization of the hydraulic control valve for controlling the operation of the work implement to direct the flow of hydraulic fluid over a relief valve built therein permits the hydraulic fluid to be heated quickly.
REFERENCES:
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patent: 3808813 (1974-05-01), Spinks
patent: 4117899 (1978-10-01), Sugaser et al.
patent: 4146294 (1978-09-01), Johnston
patent: 4161992 (1979-07-01), Abels et al.
patent: 4168757 (1979-09-01), Mather et al.
Dukes Mark C.
Love John J.
Marquette Darrell F.
Miller Larry W.
New Holland Inc.
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