DAF CF65 Series Service Manual page 340

XE ENGINE, ENGINE BRAKE
General
Protection against excessive lubricating oil
pressure
There are 2 springs above the control valve.
When the DEB is switched on, the control valve
will be moved upwards by the engine oil pressure
against the direction of the pressure of the inner
spring.
This clears the way for the lubricating oil to pass
to the high-pressure area of the DEB.
If the lubricating-oil pressure in the engine is too
≥
high ( 8 bar), the control valve will be moved
upwards against the pressure of both springs.
The control valve will move up further than usual,
preventing the route to the high-pressure area of
the DEB from being cleared.
The DEB will not function in this case.
Note:
A pressure in excess of 8 bar may result from:
- cold lubricating oil
- defective lubricating-oil pressure-relief valve
Position A:
DEB disengaged
Position B:
DEB engaged
Lubricating oil pressure between 1.5 and 8 bar
Position C:
DEB engaged
Lubricating-oil pressure approx. 8 bar
10
2-14
https://www.truck-manuals.net/
CF65/75/85 series
2
2
2
i 400196
©
200324
4
A
B
C