DAF LF45, LF55 Series. Manual — part 331
©
200416
2-1
General
ENGINE BRAKE, CE ENGINE
ΛΦ45/55 series
4
7
2. GENERAL
2.1 LOCATION OF EXHAUST BRAKE COMPONENTS
1.
Exhaust brake valve
2.
Air pipe
3.
Operating cylinder, exhaust brake
4.
Butterfly valve
1
3
4
2
i400858
ENGINE BRAKE, CE ENGINE
2-2
©
200416
General
7
ΛΦ45/55 series
4
2.2 SYSTEM DESCRIPTION, EXHAUST BRAKE
Note:
The engine brake is an exhaust brake.
Switching on the exhaust brake
The exhaust brake consists of an engine brake
operating switch fitted to the steering column and
an operating cylinder (3) connected to the
butterfly valve (4) in the exhaust pipe.
If the exhaust brake operating switch is activated,
a signal is passed to the engine management
system's electronic unit. The operating switch
has the positions "off" and "automatic". In the
"automatic" position the engine management
system's electronic unit engages the exhaust
brake whenever this is appropriate and possible.
Of course, the electronic unit disengages the
exhaust brake when required.
If the exhaust brake is engaged by the electronic
unit, the unit energises the exhaust brake valve
(1), causing supply pressure to flow to the
operating cylinder. The cylinder closes the
butterfly valve in the butterfly valve housing. The
exhaust pipe is then almost completely closed off.
The engine management system's electronic unit
also interrupts the fuel supply to the various
cylinders. The engine now acts as a compressor,
creating a braking action.
The higher the engine speed, the greater the
braking action of the engine brake.
Switching off the exhaust brake
If the engine brake control switch is pushed back,
the butterfly valve will be re-opened and the fuel
supply to the various cylinders will be re-instated.
1
3
4
2
i400858
1.
Exhaust brake valve
2.
Air pipe
3.
Butterfly valve operating cylinder
4.
Butterfly valve
©
200416
3-1
Inspection and adjustment
ENGINE BRAKE, CE ENGINE
ΛΦ45/55 series
4
7
3. INSPECTION AND ADJUSTMENT
3.1 INSPECTION AND ADJUSTMENT, EXHAUST BRAKE
Checking exhaust brake
1.
Check the exhaust brake for smooth
operation by pressurising the exhaust brake
cylinder yourself.
Setting the exhaust brake
1.
Remove the air pipe from the operating
cylinder.
2.
Slacken lock nut (1) on the piston rod.
3.
Remove the attachment nut (2) from the
operating cylinder and take the operating
cylinder off the support.
4.
Open the butterfly valve fully (exhaust brake
inactive), indicated by the mark (3) on the
butterfly valve shaft, and press the lever (4)
against the stop.
5.
Set the piston rod length by rotating the
operating cylinder in such a way that it can
be fitted on the support.
6.
Turn the piston rod one more full turn in the
ball joint to give the operating cylinder the
correct pre-tension.
7.
Fit the operating cylinder on the support
using the attachment nut (2) and fit the air
pipe.
8.
Tighten the lock nut (1).
9.
Connect the air pipe to the operating
cylinder.
i400859
1
4
3
2
ENGINE BRAKE, CE ENGINE
3-2
©
200416
Inspection and adjustment
7
ΛΦ45/55 series
4
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