Primary pressure regulation valve (page 5 of 5)

When the selector lever is moved to the "L" position, the engine braking piston moves towards the right, and the lubricating oil drains out of the circuit. The spring (14) can push the coil (15) of the engine braking valve towards the left.

The primary pressure regulation valve is then pushed to the left by the engine braking actuation rod, without the help of the selector cam (which follows the depression of the accelerator pedal).

In the "L" position a minimal pedal pressure will cause a change in the transmission speed, since the engine braking valve immediately acts on the primary pressure regulating valve.

1. "L" position
2. Sliding sensor
3. Pulley ratio (low)
4. Pulley ratio (high)
5. Engine braking lever
6. Engine braking piston
7. Pitot pressure
8. Safety valve
9. Modulation linkage
10. To primary pulley
11. Circuit pressure
12. Lubricating valve
13. Primary pressure regulation valve
14. Spring
15. Coil
16. Selector cam
17. Engine braking actuation rod
18. Engine braking valve
19. Lubrication pressure
20. To outlet