DAF CF65, CF75, CF85 Series . Manual — part 1197

©

200423

3-27

Inspection and adjustment

EXPLANATORY NOTES ON THE MAINTENANCE ACTIVITIES

ΧΦ85 series

5

3.29 CHECKING AND ADJUSTING LOAD-SENSING LEAF-SPRING

CONTROL VALVE

Explanatory notes on instruction plate
This plate is mounted on the rear door pillar on
the left-hand side of the vehicle. The data on axle
loads and delivery pressures are listed on the
instruction plate in the sequence of the axles
beneath the vehicle. Therefore, "1" refers to the
(first) front axle, "2" to the next 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

1425287

2

1.8

2.0

3.0

4.0

8.0

10.0

11.5

13.0

2

1.8

1.8

2.2

3.1

6.4

7.6

8.2

8.2

1

5.7

5.7

5.8

6.1

7.4

7.8

8.0

8.0

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 p3

PRESSURE BELLOWS

BALG DRUCK

PRESSION COUSSIN

PRESS. CUSCINI ARIA

PRESION FUELLES

bar

±0.4

±0.2

W475 721 004 0

1396041

i = 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

L = 140 mm

a = 15 ±2

G=11.0

L

p1

p2

p4

R600479

EXPLANATORY NOTES ON THE MAINTENANCE ACTIVITIES

3-28

©

200423

Inspection and adjustment

5

ΧΦ85 series

Checking and adjusting load-sensing leaf-
spring control valve
1.

Measure the weight plus load of the rear
axle(s).

2.

Check the attachment of the control lever
and its ease of operation.

3.

Check whether the correct valve and the
correct springs have been fitted (for
information, see the instruction plate).

4.

Check the length of the control lever (see "L"
on the instruction plate).

5.

Connect pressure gauge (4) to the test
connection close to connecting point

 on

the load-dependent control valve (input
pressure).

6.

Connect pressure gauge (2) to the test
connection on one of the brake cylinders
(service brake connection) of the rear axle.

7.

Make sure that the reservoir pressure is
higher than 8.5 bar throughout the testing
process.

8.

Depress the brake pedal until gauge (4)
indicates a reading of 8 bar.

9.

Read the brake pressure of the rear axle
from the pressure gauge (2) and check that
this value matches the one listed on the
instruction plate in the table under "delivery
pressure p2" to the rear axle.

1/4

4

2

2

R600562

1

©

200423

3-29

Inspection and adjustment

EXPLANATORY NOTES ON THE MAINTENANCE ACTIVITIES

ΧΦ85 series

5

10. Correct, if necessary, the brake pressure by

moving the rubber sleeve (1) in relation to the
vertical connecting rod. On no account
change the length L of the (horizontal)
control lever.

11. Remove the rubber sleeve (2) and move the

control lever towards maximum load. Check
that the delivery pressure is now allowed
through with little or no reduction.

Note:
The small socket head screw in the centre of the
valve must not be adjusted.

L

R600781

1

2

EXPLANATORY NOTES ON THE MAINTENANCE ACTIVITIES

3-30

©

200423

Inspection and adjustment

5

ΧΦ85 series

3.30 INSPECTION, FLUID LEVEL OF HYDRAULIC TRAILING-AXLE DEVICE

1.

Make sure that the trailing axle wheels are
fully lowered and on the ground.

2.

Check the fluid level. The liquid level must be
between the "min." and "max." level mark. If
necessary, top up.

3.31 INSPECTION, PIVOT POINTS OF THE HYDRAULIC TRAILING-AXLE DEVICE

1.

Check the play on the pivot points when
operating the hydraulic trailing axle.

3.32 CHECKING THE DIFFERENTIAL FOR LEAKS

1.

Visually inspect the differential for leaks.