Patent ID: 7255544

Claim:
A fixed displacement motor for a hydrostatic transmission having: a housing with a first port and a second port, having a first longitudinal end and a second longitudinal end; a shaft received within said housing having a first end extending through said housing first longitudinal end; a wear plate adjacently affixed to said housing; a gerotor set adjacently affixed to said wear plate; a manifold adjacently affixed to said gerotor set; a commutator assembly adjacently affixed to said manifold; an end cap adjacently affixed to said commutator assembly; wherein said housing has a first relief valve positioned within a first bore in fluid communication with said first port and a second relief valve positioned within a second bore in fluid communication with said second port, said first valve opens when hydraulic pressure within said first port reaches a predetermined amount and directs hydraulic fluid from said first port to said second port, bypassing said gerotor set, said second valve opens when hydraulic pressure within said second port reaches a predetermined amount and directs hydraulic fluid from said second port directly to said first port, bypassing said gerotor set.