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A hydraulic motor assembly having a motor and gear reduction set mounted in a housing. The housing may be formed of separate components, including the external surface of the ring gear and the hydraulic motor port block. The motor assembly may also include pressure relief valves or neutral valves in

A hydraulic motor assembly having a motor and gear reduction set mounted in a housing. The housing may be formed of separate components, including the external surface of the ring gear and the hydraulic motor port block. The motor assembly may also include pressure relief valves or neutral valves in the motor port block and a brake assembly mounted in the port block or on the motor housing to provide braking for the output axle.

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What is claimed is: 1. A hydraulic motor assembly for use with a separate hydraulic pump, the motor assembly comprising: a motor housing and a port block engaged to the motor housing, whereby the motor housing and port block cooperate to form a motor sump in which a motor cylinder block is mounted,

What is claimed is: 1. A hydraulic motor assembly for use with a separate hydraulic pump, the motor assembly comprising: a motor housing and a port block engaged to the motor housing, whereby the motor housing and port block cooperate to form a motor sump in which a motor cylinder block is mounted, the port block having a motor running surface formed thereon and hydraulic porting comprising a pair of passages formed therein; a pair of kidneys formed in the motor running surface of the port block, wherein each kidney is in hydraulic communication with one of the pair of passages in the hydraulic porting and in hydraulic communication with the motor cylinder block; a pair of externally opening inlets located in the port block, wherein both inlets are hydraulically connected to the hydraulic porting for providing hydraulic fluid from the separate pump to the hydraulic porting and a path for hydraulic fluid to return from the hydraulic porting to the separate pump; and a neutral valve located in the port block and providing a fluid path between the pair of passages. 2. The hydraulic motor assembly as set forth in claim 1, wherein the neutral valve extends generally parallel to the externally opening inlets. 3. The hydraulic motor assembly as set forth in claim 1, wherein the externally open inlets are located on one side of the port block and the neutral valve is located on the opposite side of the port block. 4. The hydraulic motor assembly as set forth in claim 1, wherein the neutral valve is generally collinear with one of the pair of externally opening inlets. 5. The hydraulic motor assembly as set forth in claim 1, comprising a second neutral valve providing a fluid path between the pair of passages. 6. The hydraulic motor assembly as set forth in claim 5 wherein the two neutral valves are parallel. 7. The hydraulic motor assembly of claim 1, further comprising an axle housing engaged to the port block, wherein the port block is located between the motor housing and the axle housing. 8. A vehicle comprising: a first hydraulic pump having a first pump housing; and a first hydraulic motor assembly, hydraulically connected to the first hydraulic pump, wherein the hydraulic motor assembly comprises: a first motor housing located separate from the first pump housing; a first port block engaged to the first motor housing and having a motor running surface formed thereon; a first inlet and a second inlet formed in the port block, wherein both the first and second inlets are open external to the hydraulic motor assembly and are hydraulically connected to the first hydraulic pump; a first hydraulic port formed in the port block and connected to the first inlet and a second hydraulic port formed in the port block and connected to the second inlet; and a first neutral valve positioned in the port block to control fluid flow between the first hydraulic port and the second hydraulic port. 9. The vehicle of claim 8, further comprising a second hydraulic pump having a second pump housing and being hydraulically connected to a second hydraulic motor assembly, wherein the second hydraulic motor assembly comprises a second neutral valve located in a second port block. 10. The vehicle of claim 8, further comprising an oil reservoir providing a source of oil for the first hydraulic pump. 11. The vehicle of claim 10, further comprising an oil cooler connected to at least one of the group comprising the first hydraulic pump, the first hydraulic motor, and the oil reservoir. 12. The vehicle of claim 8, wherein the first hydraulic motor assembly further comprises a second neutral valve positioned in the port block to control fluid flow between the second hydraulic port and the first hydraulic port. 13. The vehicle of claim 12, further comprising a second hydraulic pump and a second hydraulic motor assembly, wherein the second hydraulic motor assembly comprises a third neutral valve located in a second port block. 14. The vehicle of claim 13, wherein the second hydraulic motor further comprises a fourth neutral valve located in the second port block. 15. A hydraulic motor assembly for use in connection with a separate hydraulic pump located in a pump housing, the hydraulic motor assembly comprising: an axle housing; an axle shaft mounted within and extending from the axle housing; a motor housing located separate from the pump housing; a hydraulic motor located within the motor housing and driving a motor shaft; and a port block located between the axle housing and the motor housing, comprising: first and second inlets opening external to the hydraulic motor assembly for connection to the separate hydraulic pump; a first hydraulic port providing a hydraulic connection between the first inlet and the hydraulic motor, a second hydraulic port providing a hydraulic connection between the second inlet and the hydraulic motor; and a first neutral valve positioned in the port block to provide a fluid path between the first hydraulic port and the second hydraulic port. 16. The hydraulic motor assembly of claim 15, further comprising a second neutral valve positioned to provide a fluid path from the second hydraulic port to the first hydraulic port. 17. The hydraulic motor assembly of claim 15, wherein the motor shaft drives a plurality of gears that then drive the axle shaft. 18. The hydraulic motor assembly of claim 17, wherein the plurality of gears comprises a ring gear and an exterior portion of the ring gear is located between the port block and the axle housing. 19. The hydraulic motor assembly of claim 15, wherein the first neutral valve is generally collinear with the first inlet.