Patent ID: 7131268

Claim:
A pump unit comprising: a common housing; a first hydraulic pump and a second hydraulic pump, both being of a variable displacement type and accommodated within said common housing; said first hydraulic pump and said second hydraulic pump respectively including a first pump shaft and a second pump shaft, both of which have rotating shaft centers substantially parallel to each other, and a first control shaft and a second control shaft designed for controlling the input/output flow rates of said first and second hydraulic pumps; a first neutral position return mechanism for urging said first control shaft in such a direction as to return said first hydraulic pump to a neutral position thereof; a second neutral position return mechanism for urging said second control shaft in such a direction as to return said second hydraulic pump to a neutral position thereof; said first and second control shafts protruding outwardly from the same side of said common housing; and said first and second neutral position return mechanisms mounted on said same side of the common housing; wherein said first and second neutral position return mechanisms are disposed on a common base plate detachably mounted on said same side of the common housing.