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.

}

}

}