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A hydrostatic transmission having a housing with a sump and a pair of hydraulic displacement units interconnected by first and second fluid passages. A pair of bypass valves can be opened to place said first and second fluid passages in fluid communication. A recess, formed in the lower part of the

A hydrostatic transmission having a housing with a sump and a pair of hydraulic displacement units interconnected by first and second fluid passages. A pair of bypass valves can be opened to place said first and second fluid passages in fluid communication. A recess, formed in the lower part of the housing, holds make-up oil and communicates with said first and second fluid passages when the bypass valves are opened. A passage extends upwardly from the housing recess and has its upper end normally sealed by seal means. A manually operable bypass rod extends lengthwise of the passage into the area of the housing recess and has structure associated therewith for causing opening of the bypass valves. The seal means is in the form of a washer fastened to the bypass rod whereby upward movement of the bypass rod to open the bypass valves moves the washer away from the upper end of the passage whereby air bubbles that have collected in the upper part of the passage during a bypass operation can rise out of the passage and escape into the upper part of the housing.

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A hydrostatic transmission comprising, a housing with a sump, a pair of hydraulic displacement units in said housing each having a rotatable cylinder block, means extending between said cylinder blocks providing a pair of ports coacting with each cylinder block, a first fluid passage connecting one

A hydrostatic transmission comprising, a housing with a sump, a pair of hydraulic displacement units in said housing each having a rotatable cylinder block, means extending between said cylinder blocks providing a pair of ports coacting with each cylinder block, a first fluid passage connecting one port of each pair, a second fluid passage connecting the second ports of each pair, a housing recess at the bottom of the housing for holding filtered make-up oil, a pair of bypass valves normally closed to prevent flow of pressure fluid from either of said first and second passages to said housing recess, means operable to open said bypass valves to connect the first and second passages for a bypass operation, a passage extending upwardly from said housing recess and opening to the upper interior of the housing, movable seal means at the upper end of the passage for sealing the passage, and means for opening the seal means in response to opening the bypass valves.