DAF 95XF. Manual - part 432

4

XE ENGINE BRAKE

General

95

XF series

2-8

DEB switched on

i 400174

7

6

3

2

10

1

9

4

5

8

A

B

The magnetic valve (1) is activated. Lubricating
oil can pass to the hydraulic section of the DEB.
The pressure of the lubricating oil, at least
1.5 bar, moves the control valve (2) 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).

7

©

 0008

4

95

XF series

General

XE ENGINE BRAKE

2-9

i 400175

7

6

3

2

10

1

9

4

5

8

A

B

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.

7

©

 0008

4

XE ENGINE BRAKE

General

95

XF series

2-10

i 400176

7

6

3

2

10

1

9

4

5

8

A

B

When 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).

7

©

 0008

4

95

XF series

General

XE ENGINE BRAKE

2-11

Switching off the DEB

i 400177

7

6

3

2

10

1

4

A

9

5

8

B

The magnetic valve (1) is no longer activated.
The spring pressure moves the control valve (2)
downwards, as the oil pressure under the
control valve (2) can flow back into the engine
through a hole in the magnetic valve (1).
The oil from the high-pressure area of the DEB
can now escape through a cleared opening
above the control valve (2).
This is effected by the main piston (4) being
moved up by the rocker.
The spring plate (5) holds the main piston (4) in
its top position.

7

©

 0008