DAF CF65, CF75, CF85 Series . Manual — part 483
©
200324
2-7
General
XE ENGINE, ENGINE BRAKE
CF65/75/85 series
4
10
DEB operation, hydraulic
DEB disengaged
1.
Solenoid valve
2.
Control valve
3.
Operating piston
4.
Main piston
5.
Spring plate
6.
Bridge piece
7.
Exhaust valve
8.
Exhaust valve rocker
9.
Valve clearance set screw
10. DEB set screw
Note:
Rockers A and B are not one and the same rocker
(see "Hydraulic control of exhaust valves").
A. Exhaust valve rockers
B. Exhaust valve rockers
The solenoid valve (1) is not activated.
Lubricating oil cannot pass to the hydraulic part of
the DEB.
In addition, a spring plate (5) ensures that the
main piston (4) remains in the top position.
i 400159
7
6
3
2
10
1
9
4
5
8
A
B
XE ENGINE, ENGINE BRAKE
2-8
©
200324
General
10
CF65/75/85 series
4
DEB engaged
The solenoid valve (1) is activated. Lubricating oil
can pass to the hydraulic part of the DEB.
The pressure of the lubricating oil, at least 1.5
bar, moves the control valve (2) upwards against
the spring pressure and lifts the ball from its seat.
The high-pressure area of the DEB is now filled
with lubricating oil.
The oil causes the main piston (4) to move down,
until it rests on the set screw (9) of the rocker (8).
i 400174
7
6
3
2
10
1
9
4
5
8
A
B
©
200324
2-9
General
XE ENGINE, ENGINE BRAKE
CF65/75/85 series
4
10
During the next upward movement of the rocker
(8), the main piston (4) will be moved upwards.
The main piston (4) begins to build up pressure,
causing the ball in the control valve (2) to close off
the oil supply.
i 400175
7
6
3
2
10
1
9
4
5
8
A
B
XE ENGINE, ENGINE BRAKE
2-10
©
200324
General
10
CF65/75/85 series
4
If the main piston (4) continues to move up, this
movement is transferred hydraulically to the
operating piston (3).
The operating piston (3) moves downwards
against the spring pressure, opening one exhaust
valve.
In the case of loss of oil during operation, this will
automatically be compensated for by the control
valve (2).
i 400176
7
6
3
2
10
1
9
4
5
8
A
B
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