Service Manual

Transmission Hydraulic Support System
The charge pump incorporated into the BDP-1 0L units Since either of the main hydraulic passages can be
supplies fluid to keep the closed loop charged, prevent- at high pressure,
two (2) charge check valves are
ing cavitation and providing cooling oil flow for the
used to direct make-up fluid into the low pressure side
system. An inlet filter is required to insure that only of the closed loop. These check valves are located in
clean fluid enters the system. The charge relief valve
is the pump end cap.
designed to maintain the charge pressure at 25 to 70
PSI at 3600 RPM input speed.
FILTER