DAF CF65, CF75, CF85 Series . Manual — part 962

©

200423

3-5

Inspection and adjustment

STEERING BOX

ΧΦ65/75/85 series

7

3

16. Turn the steering wheel fully left (RHD fully

right) until the end stop is reached. Fit a

torque wrench to the steering wheel nut and

pull on the torque wrench with a tightening

torque of 35 Nm. The maximum reading on

the pressure gauge should be 80 bar.

This will correctly re-adjust the wheel

deflection limiting valve, which has its end

stop at the steering box cover.

17. Run the engine at idling speed and turn the

steering wheel fully right (RHD fully left) until

the end stop is reached. The pressure

should not exceed approx. 100 bar; this

pressure should not be continued for more

than 5 seconds.

18. While the steering wheel is at its end stop,

loosen the lock nut one turn and screw in the

adjusting bolt, while securing the lock nut at

the same time.

Screw in the adjusting bolt, until the pressure

is reduced to a maximum of 80 bar. This will

correctly re-adjust the wheel deflection

limiting valve, which has its end stop against

the adjusting bolt.

19. Set the engine speed to 1200 - 1400 rpm.

The final limiting pressure should not exceed

80 bar.

Screw the adjusting bolt in further if the

pressure is too high.

Note:

Do not screw in the adjusting bolt further than

is strictly required, as the other wheel

deflection limiting valve could lose its

previous setting in this way, in which case

the adjusting procedure must be repeated

from the start.

There is also the chance that the wheel

deflection limiting valve will open too early,

thus reducing the pressure too fast so that

maximum wheel deflection is not reached.

20. Tighten the lock nut to the specified

tightening torque. See 'Technical data'.

21. Turn the steering wheel fully left (RHD fully

right) until the end stop is reached. Set the

engine speed to 1200 - 1400 rpm and check

the final limiting pressure.

LHD

RHD

35Nm

S7 00 562

RHD

LHD

max.
100 bar

S7 00 563

STEERING BOX

3-6

©

200423

Inspection and adjustment

3

ΧΦ65/75/85 series

7

22. Measure the length of the part of the

adjusting bolt that protrudes from the

steering box (distance A in drawing). The

total length (including the nut) should not

exceed 26 mm.

If the adjusting bolt protrudes further from the

steering box than the above-mentioned

length, an adjusting bolt of the wrong length

has been used or the wheel deflection

limiting valves have been incorrectly set.

In that case, the total length of the adjusting

bolt should be checked, and the adjusting

procedure repeated.

The adjusting bolt should not

protrude further from the steering

box than is specified, in order to

keep a sufficient screw thread length

in the housing. A larger dimension

could result in loss of the bolt and

loss of steering power.

23. Remove the jack.

24. Remove the T-piece and the pressure

gauge.

25. Fit the delivery line.

26. Check the steering oil level in the reservoir

after connecting the pressure gauge and top

up the oil if required.

27. Bleed the steering gear. To do so, run the

engine at idling speed for approx. 2 minutes,

without steering.

28. Retighten the steering wheel nut to the

specified tightening torque. See 'Technical

data'.

3

2

1

A

S7 00 045

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©

200423

3-7

Inspection and adjustment

STEERING BOX

ΧΦ65/75/85 series

7

3

3.2 INSPECTION AND ADJUSTMENT, PRESSURE POINT

Inspection of the pressure point
1.

Place the sector shaft in the central position,

by aligning the markings on the sector shaft

and on the steering box.

2.

Remove the steering rod from the pitman

arm.

Note:

When a steering rod has been removed, the

input shaft must not be rotated more than

1.5 turns (counting from the central position)

because otherwise the setting of the wheel-

deflection limiting valves will be changed.

3.

Check whether the sector shaft is still in the

central position, using the markings.

4.

Take hold of the pitman arm and carefully

move it in its direction of rotation to feel

whether there is play. Make sure that the

input shaft is not rotated more than 1.5 turns,

counting from the central position.

There should be no play in the central

position of the steering box. Outside the

central position of the steering box, play is

allowed.

5.

If play can be felt, this can be remedied using

the adjusting bolt (1).

S7 00 024

S7 00 027

S7 00 593

1

2

STEERING BOX

3-8

©

200423

Inspection and adjustment

3

ΧΦ65/75/85 series

7

Adjusting the pressure point
1.

Check whether the sector shaft is still in the

central position, using the marks.

2.

Loosen the lock nut (2) one turn.

3.

Loosen the adjusting bolt (1) one turn until

noticeable play can be felt.

4.

Slowly turn the adjusting bolt (1) to the right,

until no play can be felt at the pitman arm.

The torque used should not exceed 15 Nm.

5.

Turn the adjusting bolt another

 to ∂ turn

clockwise.

If the adjusting bolt is turned

clockwise too far, the steering wheel

will not return to its central position

by itself after making a turn. The

steering force at the central position

will increase and the directional

stability characteristics of the

vehicle will deteriorate.

6.

Tighten the lock nut (2) to the specified

tightening torque. See 'Technical data'.

Make sure that the adjusting bolt (1) does not

turn too.

7.

Check the pitman arm to see whether there

is still play. You should not feel any play for a

 of a turn to the left and right of the central

position of the input shaft.

8.

If play can still be felt, the adjusting

procedure should be repeated.

9.

Fit the steering rod on to the pitman arm.

10. Make a test run and check the vehicle's

directional stability and check whether the

steering wheel returns to the central position

after taking a turn.

S7 00 024

S7 00 593

1

2

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