DAF CF65, CF75, CF85 Series . Manual - part 954

 

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DAF CF65, CF75, CF85 Series . Manual - part 954

 

 

©

 200423

3-9

Inspection and adjustment

STEERING GEAR, GENERAL

ΧΦ65/75/85 series

7

2

Note:

When the cock (4) is closed, the steering 

wheel should never be turned. The peak 

pressures involved could damage the pump 

or the test case.

3.

Open the cock (4).

4.

Compare the reading with the specified 

value, see 'Technical data'.

Testing the pump output
1.

Activate the output meter (7) using the 

switch (8).

2.

Set the engine speed to 1200 - 1400 rpm.

3.

Close the cock (4) until the pressure 

gauge (10) indicates the specified pump 

output pressure. See 'Technical data'.

4.

Take the pump output reading at the output 

meter (7) and compare this value with the 

specified value. See 'Technical data'.

Testing the steering pump flow control valve
1.

Activate the output meter (7) using the 

switch (8).

2.

Slowly increase the engine speed, until the 

output meter (7) reading no longer rises. 

Check whether the output is stable and 

compare the measured reading with the 

specified reading, see 'Technical data'.

3.

Increase and decrease the engine speed 

and check whether the output increases 

evenly and then remains stable.

4.

Slowly close the cock (4) until the pressure at 

the pressure gauge (10) has increased to 

approx. 50 bar. While closing the cock, 

check whether the pressure gauge (10) 

needle starts to fluctuate.

Testing the internal steering box leakage
1.

Check whether the connection between the 

"Tank" connection and the steering oil 

reservoir has been established. The 

connection to the reservoir should continue 

to the bottom of the reservoir, to prevent 

foaming.

50

100

150

200

250

5

10

15

20

25

  9

7
8

2

4

6

5

10
11

  1
  3

S7 00 020

50

100

150

200

250

5

10

15

20

25

  9

7
8

2

4

6

5

10
11

  1
  3

S7 00 020

STEERING GEAR, GENERAL

3-10

©

 200423

Inspection and adjustment

2

ΧΦ65/75/85 series

7

2.

Open the non-return valve (5).

3.

Close the cock (4) completely.

4.

Adjust the pressure to 30 bar under the 

maximum system pressure using the non-

return valve (5).

5.

Open the cock (4) completely.

6.

Activate the output meter (7) using the 

switch (8).

7.

Activate the steering gear and fit a 15-mm 

filler piece, special tool (DAF no. 0535996), 

between the adjusting bolt and the axle stop.

Be careful when fitting the 15-mm 

filler piece between the adjusting 

bolt and the axle stop, because there 

is a danger of limbs getting trapped. 

8.

Fit a torque wrench with a dial to the steering 

wheel nut and tighten the nut to a tightening 

torque of 45 Nm on the torque wrench.

9.

Read off the leak-off oil quantity and 

compare this quantity with the maximum 

admissible leak-off oil quantity. See 

'Technical data'.

10. Carry out the measurement for the other 

wheel deflection.

50

100

150

200

250

5

10

15

20

25

  9

7
8

2

4

6

5

10
11

  1
  3

S7 00 020

S7 00 598

}

45Nm

45Nm

S7 00 565

©

 200423

3-11

Inspection and adjustment

STEERING GEAR, GENERAL

ΧΦ65/75/85 series

7

2

11. If an excessive internal leakage is measured 

for a vehicle equipped with a slave cylinder 

(see 'Technical data'), the measurement 

should be repeated with the slave cylinder 

disconnected.

-

Mark the slave-cylinder lines and 

remove these from the steering box.

-

Fit suitable plugs into the slave cylinder 

line connections to plug the steering 

box.

-

Place the lines from the slave cylinder in 

a reservoir, as the slave cylinder will 

force the oil from the lines while 

steering.

Note:

Never connect the slave cylinder lines to 

each other. The volumes of the left- and 

right-hand cylinder halves are not equal, 

resulting in a pressure build-up in the slave 

cylinder while steering.

-

After the slave cylinder has been 

disconnected, measuring should be 

repeated and the reading compared 

with the maximum admissible value. 

See 'Technical data'.

12. If the steering gear "jams", the test should be 

repeated with a set pressure of 15 - 30 bar.

Testing the steering-wheel nut attachment
As the steering wheel nut might be slackened by 

the torque wrench, the steering wheel nut should 

be re-tightened to the specified tightening torque. 

See 'Technical data'.

Removing the test case
1.

Remove the hoses and connect the delivery 

line.

2.

Reconnect the slave cylinder lines, if these 

have been removed.

3.

Check the steering oil level and top up as 

necessary.

4.

Bleed the system.

5.

Inspect the line connections for leaks.

6.

Remove the jack.

7.

With an EMAS-controlled trailing axle install 

the fuses for the EMAS system.

STEERING GEAR, GENERAL

3-12

©

 200423

Inspection and adjustment

2

ΧΦ65/75/85 series

7

3.3 INSPECTION OF SECOND CIRCUIT OF THE DUAL-CIRCUIT SYSTEM

Test the operation of the second 

circuit in an open yard, devoid of 

traffic. This test may not be 

performed on the public road.

1.

Drive at a speed of 30 km/h.

2.

Put the gear lever in neutral position and 

switch off the engine with the contact key.

Make sure that the key is only turned 

back one position. If, by accident, 

the key is turned back too far, it 

could be removed, thus activating 

the steering wheel lock and blocking 

the steering gear.

3.

After switching off the engine, check whether 

warning indicator 1 of circuit 1 lights up.

4.

Carry out the test at a vehicle road speed of 

30 to 15 km/h.

Turn the steering wheel a 

 to ∂ turn to the 

left and to the right.

5.

If the steering gear is not equipped with a 

slave cylinder, the required steering force 

should not exceed the force required when 

the engine is running.

If the steering gear is equipped with a slave 

cylinder, the required steering force may 

exceed the force required when the engine is 

running, because the slave cylinder is 

switched off.

At a vehicle road speed of less than 

10 km/h, the vehicle will steer very 

heavily.

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