500SEL (126.037) V8-5.0L (117.963) (1984)
Secondary pump
24 Primary pump check valve
64 Lubricating pressure
66 Secondary pump shaft valve
67 check valve
70 Primary pump
72 check valve
73 Centrifugal
74 Drive for governor
75 Secondary pump
76 Secondary pump cutoff piston
77 Oil filter
A Working pressure
SR Lubricating pressure
B2 Connection to shift side B2
o Oil sump outlet
RA Excess pumped oil flow back through nozzle (D) of working pressure control valve into suction passage of primary pump
D Nozzle
a,b,c
Restrictions
d,e
The secondary pump (75) is required only for towing and low-starting the car. It is designed as an external gear pump and is positioned in the rear
section of the transmission.
The secondary pump is driven it needed by the shalt of the centrifugal governor. Once the engine has started when the car is tow-started the
secondary pump is only disconnected again once either the car has come to a stop or the transmission has shifted into 4th gear.
When the system is pressureless, the drive of the secondary pump is not engaged again until the vehicle is stationary (deflection slopes on the
engaging gears).
Secondary pump operating. i.e. engine not running and car rolling (tow-starting procedure). brake band B2 begins to engage.