Hydrostatic assembly

A method of increasing an output associated with a 1st hydraulic piston drive unit in a hydrostatic assembly without using additional servo assemblies, the hydrostatic assembly comprising:

• a housing;
• a pivot axis;
• the 1st hydraulic piston drive unit comprising:
• a cylinder block with ports,
• pistons within the cylinders in the cylinder block, and
• a drive shaft mounted to the housing;
• common means for adjusting displacement of the 1st hydraulic piston drive unit, the common means mounted on the pivot axis and capable of rotation;
• a 3rd hydraulic piston drive unit comprising:
• a cylinder block with ports,
• pistons within the cylinders in the cylinder block, and
• a drive shaft mounted to the housing;
• 2nd means for adjusting displacement of the 3rd hydraulic piston drive unit, the 2nd means mounted on the pivot axis and capable of rotation independently of the common means;
• at least one fluid passage connecting the ports of the cylinder block in the 1st hydraulic drive unit to the ports of the cylinder block in the 3rd hydraulic drive unit,
• the method comprising:
• providing a 2nd hydraulic piston drive unit comprising:
• a cylinder block with ports,
• pistons within the cylinders in the cylinder block, and
• a drive shaft mounted to the housing;
• coupling the drive shaft of the 2nd hydraulic piston drive unit to the drive shaft of the 1st hydraulic piston drive unit;
• and
• employing the common means to simultaneously adjust displacement of the 1st and 2nd hydraulic piston drive units.