Cub Cadet 3000 Series - Manual (Page 122)

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Cub Cadet 3000
The BDU-21L transmission offers an optional
Implement (auxiliary) pump. The auxiliary circuit
provides a rated flow of 1.5 gpm and 500 PSI
operating pressure at a 3200 RPM pump speed.
Fluid from the charge pump flows first to the
implement control valve, then to the charge relief
valve and charge check valves in the center section.
This requires an “open center” type control valve to
allow fluid flow to return to the transmission. A check
valve is included to allow oil to be drawn into the
charge circuit should flow returning from the
implement circuit be insufficient to charge the closed
loop. A relief valve must be included in addition to the
implement control valve.