Cub Cadet BDU-10/21 - Manual (Page 4)

BDU-10/21
BDU-10/21 Page 4
General Description
The BDU-21L transmission offers an optional Implement
(auxiliary) pump. The auxiliary circuit provides a rated flow
of 1.5 gpm (5.67 l/min) and 500 PSI (34.5 bar) 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.
The BDU-21L offers an Easy Ride Valve option. The Easy
Ride Valve acts like a high pressure spike suppressor in
the system loop. The valve opens under high acceleration
loads. The result is a dampening of the aggressiveness,
without affecting the overall efficiency of the transmission.
BDU-10S Hydrostatic Flow Illustration
BDU-21L Transmission with Easy Ride Valve
Option