Patent ID: 7409890

Claim:
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.