The BD hydrostatic transmission can be applied for the transfer and control of power. It provides an infinitely variable speed range between zero and maximum in both forward and reverse modes of operation.
The BDU transmission is a “ Z” style transmission with a variable displacement pump and a fixed displacement motor. The variable displacement pump features a cradle swashplate with a direct proportional displacement control. Reversing the direction of tilt of the swashplate reverses the flow of oil from the pump and thus reverses the direction of the motor output rotation. The fixed displacement motor uses a fixed swashplate. The pump and motor are of the axial piston design and utilize sphericalnosed pistons which are held against a thrust bearing by internal compression springs.
The fluid supply for the BDU-10L/21L/21H transmission is contained in an external reservoir and passes through an external filter prior to entering the transmission and feeding the fixed displacement gerotor charge pump. Excess fluid in the charge circuit is discharged over the charge relief valve back to the charge pump inlet. Constant flow across a small fixed orifice connecting the charge circuit to the transmission housing supplements the cooling flow.
The BDU-06s/10s transmission has a self-contained fluid supply and an integral filter. The fluid is forced through the filter by positive “head” on the fluid in the housing reservoir with an assist by the negative pressure created in the pump pistons as they create a vacuum. Charge check valves in the center section are used to control the makeup flow of fluid to the low pressure side of the loop. A spool type bypass valve is utilized in the transmission to permit moving the vehicle over short distances at low speeds without starting the engine.
The BDP-10L is a variable displacement pump to utilize the pump kit of the BDu-10L transmission and designed for vehicle application which is for propel or for auxiliary functions where the system pressure requirements and design life can be met within pump rating.
•  A complete transmission family to meet the needs of small vehicle application.
•  3 Transmission frame sizes: 6, 10, 21
•  PTO Capability on“Z”Style Transmission
•  Variable Pump Version of 10 Frame Size Available (10cm3)
•  Cost Effective,Compact, Lightweight Design
•  Low noise
•  High Efficiency
•  Worldwide Sales and Service