DAF CF65, CF75, CF85 Series . Manual - part 1128

©

 200518

3-21

Inspection and adjustment

EXPLANATORY NOTES ON THE MAINTENANCE ACTIVITIES

ΧΦ65/65 (II) series

5

Version: Knorr SN 7000
1.

Check the transition between the ribbed part 

of the rubber cover and the smooth part (A). 

If the smooth part is rolled inwards, the brake 

shoe and brake disc thicknesses must be 

checked.

A

A

A

R600730

EXPLANATORY NOTES ON THE MAINTENANCE ACTIVITIES

3-22

©

 200518

Inspection and adjustment

5

ΧΦ65/65 (II) series

3.25 INSPECTION AND ADJUSTMENT, LOAD-DEPENDENT CONTROL VALVE, 

AIR SUSPENSION

Explanatory notes on instruction plate 
for CF65

This plate is mounted on the rear door pillar of the 

vehicle. The information on the instruction plate 

relates to the axle loads, the delivery pressures 

and bellows pressures, following the sequence of 

the axles beneath the vehicle. 

"1" refers to the (first) front axle, "2" to the 

following axle, etc.

If the vehicle is fitted with a relay valve in the front 

axle brake circuit, the box beneath the valve 

illustration will be blank. Throughout the column, 

a value of 8.1 bar has been filled in for "delivery 

pressure p2" under axle "1".

If the vehicle is equipped with a control valve 

instead of the relay valve mentioned, the box will 

contain a pressure ratio, e.g. "i = 1 : 1.5". The 

"delivery pressure p2" of axle "1" then indicates 

variable readings.

These values can be used to check the brake 

pressure values of the front axle and to carry out 

the inspection/adjustment below at the same 

time. To do this, connect a pressure gauge to the 

test connection of one of the front axle brake 

cylinders.

AUTOM. LASTAFHANKELIJKE REMKRACHTREGELING
AUTOM. LOAD SENSING DEVICE
AUTOM. LASTABHAENGIGE BREMSKRAFT REGELEINR.
DISPOSITIF DE CORRECTION AUTOM. DE FREINAGE
REGOLATORE AUTOM. DELLA FORZA FRENANTE
REGULADOR AUTOM. DEL ESFUERZO DE FRENANDA

TYPE   -  TIPO   :   FA

1425289

2

1.8

2.5

4.0

5.0

6.0

10.0

11.5

13.0

2

2.0

2.1

2.8

3.5

4.3

7.3

8.3

8.3

3

1

5.7

5.8

6.0

6.3

6.6

7.7

8.1

8.1

12

0.2

0.5

1.3

1.8

2.3

4.2

4.9

5.6

1

ASLAST                          G

AXLE LOAD

ACHSLAST

CHARGE SOUS ESSIEU

CARICO ASSE

CARGA EJE

    

x10

4

 N

UITGESTUURDE DRUK   p2

DELIVER

Y PRESSURE

AUSGESTEUER

TER DRUCK

PRESSION DELIVREE

PRESSIONE USCIT

A

PRESION DE SALIDA

                 bar

BALG DRUK                     p43

PRESSURE BELLOWS

BALG DRUCK

PRESSION COUSSIN

PRESS. CUSCINI ARIA

PRESION FUELLES

                  bar

±0.4

±0.2

W475 721 003 0

1  =  1  :  1.5

MEEREGEL

VENTIEL

EMPTY

-LOAD V

A

LV

E

LAST

-LEER VENTIEL 

V

A

LVE CHARGE-VIDE

V

A

LVOLA VUOTO-CARICO

V

A

LVULA V

ACIO-CARGA

p1 = > 8.5 bar

p4 = 8.0 bar

p1

p2

p4

p43

R600472

©

 200518

3-23

Inspection and adjustment

EXPLANATORY NOTES ON THE MAINTENANCE ACTIVITIES

ΧΦ65/65 (II) series

5

Explanatory notes on instruction plate for 
CF65 (II)

This plate is mounted on the rear door pillar of the 

vehicle. The information contained on the plate 

relates to the axle loads, the output pressures 

and bellows pressures, in accordance with the 

order of axles beneath the vehicle.

So "1" is the front axle and "2" the rear axle. 

"G" stands for the load in kg.

These values can be used to check the brake 

pressure values of the front axle and to carry out 

the inspection/adjustment below at the same 

time. To do this, connect a pressure gauge to the 

test connection of one of the front axle brake 

cylinders.

Inspection and adjustment, load-dependent 
control valve, air suspension
1.

Check that the correct valve has been fitted 

(see instruction plate).

2.

Connect pressure gauge (4) to the test 

connection close to connecting point 

 on 

the load-dependent control valve (input 

pressure).

3.

Connect pressure gauge (2) to the test 

connection on one of the brake cylinders 

(service brake connection) of the rear axle.

4.

Connect a pressure gauge (43) with a 

pressure-reducing valve to the simulation 

connection near connections 41 and 42 of 

the load sensing valve (= simulated 

adjustable bellows pressure).

5.

Make sure that the reservoir pressure is 

higher than 8.5 bar throughout the testing 

process.

6.

Set the simulated bellows pressure to its 

second lowest value, as indicated on the 

instruction plate.

7.

Depress the brake pedal until the pressure 

gauge (4) indicates a pressure of 8 bar.

R600951

43

1/4

4

2

2

R600473

1

41 42

r

s

EXPLANATORY NOTES ON THE MAINTENANCE ACTIVITIES

3-24

©

 200518

Inspection and adjustment

5

ΧΦ65/65 (II) series

8.

Read the brake pressure of the rear axle on 

pressure gauge 2 and check that this brake 

pressure matches the one listed on the 

instruction plate in the table under "output 

pressure p2" to the rear axle.

9.

If the measured value is not correct, 

depressurise connection (43) and, using a 

special tool (DAF no. 1329464), turn the 

adjusting nut (s):

-

brake pressure too high: unscrew the 

adjusting nut

-

brake pressure too low: screw in the 

adjusting nut.

Note:

When depressurising the simulation 

connection (pressure gauge 43), the air hose 

must remain connected to prevent the 

(actual) bellows pressure from accidentally 

activating the valve.

The small socket head screw in the centre of 

the valve must not be adjusted.

10. Repeat the procedure described in point 6 

until the measured brake pressure value is 

within the tolerance limits.

11. Set the simulated bellows pressure to its 

second highest value, as indicated on the 

instruction plate.

12. Depress the brake pedal until the pressure 

gauge (4) indicates a pressure of 8 bar.

13. Read pressure gauge (2) and check that this 

brake pressure matches the pressure 

indicated in the table on the instruction plate.

14. If the measured reading is not correct, 

depressurise connection (43) and turn 

adjusting bolt (r) using a Torx screwdriver:

-

brake pressure too high: screw in the 

adjusting bolt

-

brake pressure too low: unscrew the 

adjusting bolt.

Note:

When depressurising the simulation 

connection (pressure gauge 43), the air hose 

must remain connected to prevent the 

(actual) bellows pressure from accidentally 

activating the valve.

The small socket head screw in the centre of 

the valve must not be adjusted.

15. If the adjusting bolt (r) has been turned, 

repeat the procedure from point 6.

R600478