DAF CF65, CF75, CF85 Series . Manual — part 1111

©

200448

2-1

Inspection and adjustment

FAG

ΧΦ65/75/85 series

9

7

2. INSPECTION AND ADJUSTMENT

2.1 INSPECTION AND ADJUSTMENT, HEIGHT-CONTROL VALVE

1.

Measure the joint axle load of the leading

rear axle and the driven rear axle.

2.

Check the DAF number of the rear axle leaf

spring. The number is indicated on the front

of the leaf spring.

3.

Look up the axle load ratio of the vehicle

concerned. The axle load ratio is indicated

on the vehicle identification plate, fitted on

the left-hand side door post.

4.

Check the adjustment of the pressure-

limiting valve and adjust it if necessary.

5.

Check whether the bolt (A) is located in the

lower position of the slotted hole. Check

whether the bolt (A) is well tightened

6.

Measure the length l of the lever (B) and

check the lever length on the basis of the

value indicated in the table concerned, see

"Technical data". Adjust the lever length, if

necessary, to the length stated in the table.

7.

Fit a T-piece fitted with a test connection in

the pipe from the pressure-relief valve to the

air bellows.

8.

Connect a calibrated pressure gauge to the

test connection.

9.

Measure the bellows pressure. Look up in

the correct table, see "Technical data', the

relevant bellows pressure at the total axle

pressure measured and compare it with the

bellows pressure measured.

10. If the bellows pressure has to be adjusted,

the connection rod (C) between the lever and

the rear axle body must be extended or

shortened. Extending increases the pressure

and shortening decreases the pressure.

C9 00 436

A

B

C

l

W9 09 002

FAG

2-2

©

200448

Inspection and adjustment

7

ΧΦ65/75/85 series

9

11. After adjusting, operate the height-control

valve by hand by moving the lever (B) up and

down.

12. Let the height-control valve return to the

initial position and check the bellows

pressure once again. Repeat this procedure

several times.

Note:

After the connection rod length has been

adjusted, the axle load ratio of the steered

leading rear axle and the driven axle

changes will have changed in relation to one

another. It is therefore necessary to check

the setting of the ALR valve.

13. Check the setting of the pressure-relief

valve.

©

200448

2-3

Inspection and adjustment

FAG

ΧΦ65/75/85 series

9

7

2.2 INSPECTION AND ADJUSTMENT, PRESSURE-LIMITING VALVE

1.

Connect a pressure gauge to the output pipe

(pipe connection 2).

2.

Increase and reduce the input pressure. The

output pressure should immediately also rise

and fall to under the set limiting pressure.

3.

Enter the input pressure and check whether

the limiting pressure corresponds with the

value indicated. See "Technical data".

4.

Adjust the valve by tightening or slackening

the adjustment bolt. Tightening the adjusting

bolt increases the pressure, slackening

decreases the pressure.

W909003

FAG

2-4

©

200448

Inspection and adjustment

7

ΧΦ65/75/85 series

9

2.3 INSPECTION AND ADJUSTMENT, PRESSURE-RELIEF VALVE

1.

Fit a T-piece fitted with a test connection in

the pipe from the pressure-relief valve to the

air bellows.

2.

Connect a pressure gauge to the test

connection.

3.

Pressurise the bellows.

4.

Switch on the electropneumatic valve, by

which means the bellows are vented.

5.

Check whether the residual pressure agrees

with the value indicated, see "Technical

data".

6.

The residual pressure can be adjusted by

tightening or slackening the adjustment bolt

of the pressure-relief valve. Tightening the

adjusting bolt increases the pressure,

slackening decreases the pressure.

Note:

If the pressure-relief valve is replaced, make

sure that when connecting the pressure-

relief valve that it is connected in the correct

manner. Pipe connection 2 is connected to

the pipe from the electropneumatic valve and

pipe connection 1 is connected to the pipe to

the air bellows.

W909004