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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. Pressure relief valves or neutral valves may be located in the motor port block

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. Pressure relief valves or neutral valves may be located in the motor port block.

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1. A hydraulic motor assembly having an external casing, the motor assembly comprising:a motor housing forming an internal volume and having an external surface forming part of the external casing; a port block engaged to the motor housing and having a motor running surface formed thereon and hydrau

1. A hydraulic motor assembly having an external casing, the motor assembly comprising:a motor housing forming an internal volume and having an external surface forming part of the external casing; a port block engaged to the motor housing and having a motor running surface formed thereon and hydraulic porting formed therein; at least one pressure relief valve located in the hydraulic porting; a hydraulic motor mounted on the motor running surface; a motor shaft mounted in the housing and engaged to the hydraulic motor; an axle mounted in and extending out of one end of the housing, wherein the axle is driven by the motor shaft; a ring gear having a gear surface formed on an internal surface thereof; and a gear train engaged to the motor shaft, wherein at least part of the wear train runs on the gear surface. 2. A hydraulic motor assembly as set forth in claim 1, further comprising a plurality of pressure relief valves located in the port block.3. A hydraulic motor assembly as set forth in claim 1, wherein the ring gear has an external surface forming a part of the external casing.4. A hydraulic motor assembly as set forth in claim 2, wherein the hydraulic motor comprises an axial piston motor having pistons which move in a direction parallel to the motor shaft.5. A hydraulic motor assembly as set forth in claim 4, wherein the pistons have a spherically shaped nose.6. A hydraulic motor assembly as set forth in claim 1, wherein the gear train comprises a first planetary gear reduction set driven by the motor shaft and running on the ring gear.7. A hydraulic motor assembly as set forth in claim 6, further comprising a second planetary gear reduction set driven by the first planetary gear reduction set.8. A hydraulic motor assembly as set forth in claim 7, where the first and second planetary gear reduction sets are both running on the gear surface of the ring gear.9. A hydraulic motor assembly having an external casing, the motor assembly comprising:a motor housing forming an internal volume and having an external sure forming part of the external casing; a port block engaged to the motor housing and having a motor running surface formed thereon and hydraulic porting formed therein; at least one neutral valve located in the hydraulic porting; a hydraulic motor mounted on the motor running surface; a motor shaft mounted in the housing and engaged to the hydraulic motor; an axle mounted in and extending out of one end of the housing, wherein the axle is driven by the motor shaft; a ring gear having an external surface forming a part of the external casing and an internal surface having a gear surface formed thereon; and a gear train engaged to the motor shaft wherein at least part of the gear train runs on the gear surface. 10. A hydraulic motor assembly as set forth in claim 9, further comprising a plurality of neutral valves located in the port block.11. A hydraulic motor assembly as set forth in 10, wherein the hydraulic motor comprises an axial piston motor having pistons which move in a direction parallel to the motor shaft.12. A hydraulic motor assembly as set forth in claim 9, wherein the gear train comprises a first planetary gear reduction set driven by the motor shaft and running on the ring gear.13. A hydraulic motor assembly as set forth in claim 12, further comprising a second planetary gear reduction set driven by the first planetary gear reduction set.14. A hydraulic motor assembly as set forth in claim 13, where the first and second planetary gear reduction sets are both running on the gear surface of the ring gear.