DAF LF45, LF55 Series. Manual — part 236

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200508

2-5

Description of components

PNEUMATIC GEARBOX CONTROL

ΛΦ45/55 series

3

3

2.4 NEUTRAL POSITION VALVE

The neutral position valve is mounted on the

selector shaft housing. Inside the selector shaft is

a slot that corresponds to the neutral position of

the selector shaft. The neutral position valve pawl

drops into this slot. When a gear is engaged, the

neutral position valve pawl moves out of the slot,

thereby switching the valve. In the neutral

position the system pressure is sent to the

electropneumatic downshift protection valve. In

the event of a gear change, the gear lever and the

neutral position valve will be moved through the

neutral position. At that moment the neutral

position valve sends the system pressure from

connection (21) to the electropneumatic

downshift protection valve.

V3 00 476

PNEUMATIC GEARBOX CONTROL

2-6

©

200508

Description of components

3

ΛΦ45/55 series

3

2.5 RANGE GROUP ENGAGING CYLINDER

The range group engaging cylinder is mounted

on the rear of the gearbox.

The engaging cylinder is supplied from the

electropneumatic downshift protection valve.

V3 00 479

L

H

©

200508

3-1

Inspection and adjustment

PNEUMATIC GEARBOX CONTROL

ΛΦ45/55 series

3

3

3. INSPECTION AND ADJUSTMENT

3.1 PROGRAMMING PARAMETERS USING DAVIE

After a gearbox has been replaced by a gearbox

that uses a different reduction rate, it will be

necessary to reprogram the VIC by means of

DAVIE XD.

This is to ensure that the downshift protection

valve is enabled and disabled at the correct

vehicle speeds.

It is not possible to adjust the frequencies of the

gate protection and the range-change protection

with the standard program of DAVIE XD. If the

vehicle configuration is changed, this should

always be reported.

PNEUMATIC GEARBOX CONTROL

3-2

©

200508

Inspection and adjustment

3

ΛΦ45/55 series

3

3.2 SIMULATING SPEED SIGNAL

The speed signal can be simulated with DELSI

(DAF no. 0694941). DELSI must be connected to

the speed sensor connector.

Before connecting DELSI to the speed sensor

connector, an adapter cable must be made.

The adapter cable must consist of the following

wiring:

When the speed sensor connector is

disconnected, a fault is stored in the tachograph.

This fault can be deleted using DAVIE XD.

V300425

2

4

3

1

K100873

Pin 1: speed sensor, power supply
Pin 2: speed sensor, earth
Pin 3: speed sensor, "real-time"

speed/distance signal

Pin 4: not in use