DAF CF65, CF75, CF85 Series . Manual - part 960

 

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DAF CF65, CF75, CF85 Series . Manual - part 960

 

 

©

 200423

2-5

General

STEERING BOX

ΧΦ65/75/85 series

7

3

Wheel deflection limiting
To reduce the system pressure at the maximum 

wheel deflection, the piston is equipped with two 

wheel deflection limiting valves (3) and (8).

The pins (2) and (9) of the wheel deflection 

limiting valves touch their stops before the 

maximum wheel deflection is reached. The pin 

opens the valve (5) and both cylinder halves 

become connected, thus decreasing the system 

pressure.

The pin (2) of the wheel deflection limiting 

valve (3) touches the cover (1), and the pin (9) of 

the wheel deflection limiting valve (8) touches the 

adjusting bolt (10).

The wheel deflection limiting valves are automa-

tically adjusted when a new steering box is fitted.

The wheel deflection limiting valves are fitted into 

the piston using clamping bushes (4), thus 

making it possible for the valves to slide within the 

piston.

If a new steering box is fitted, the wheel deflection 

limiting valves protrude far enough from the 

piston so that they will touch the end stops (the 

cover and the adjusting bolt) well before the 

maximum wheel deflection is reached.

The first time the steering box is turned to its 

maximum steering position (both to the left and to 

the right) - with a front axle which is correctly 

adjusted for maximum wheel deflection - the 

2

9

3 4

5

5

6

7

1

8 4

10

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STEERING BOX

2-6

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 200423

General

3

ΧΦ65/75/85 series

7

wheel deflection limiting valves will be depressed 

to the correct depth in the piston, resulting in a 

correct valve adjustment.

If the wheel deflection is to be reduced (e.g. 

because wider tyres have been fitted), the 

adjustment of the wheel deflection limiting valves 

must be reset. This is done as follows:

Place the steering box in the central position, and 

screw adjusting bolt (10) further into the steering 

box.

By moving the piston towards the adjusting 

bolt (10), the wheel deflection limiting valve (8) 

will touch the adjusting bolt (10), thus pushing the 

valve (8) deeper into the piston. A distance pin (7) 

is fitted between wheel deflection limiting 

valves (3) and (8). If the valve (8) is pushed 

deeper into the cylinder, the valve will touch the 

pin (7), and the pin will subsequently push the 

valve (3) partially out of the piston.

By moving the piston in the direction of the 

cover (1) to the maximum wheel deflection, the 

wheel deflection limiting valve (3) will touch the 

cover and the valve will be pushed into the piston 

to the correct depth. This completes correct 

setting of the valve (3). During this action, the 

wheel deflection limiting valve (8) is also pushed 

partially out of the piston.

The correct setting of the wheel deflection limiting 

valve (8) is finally restored using the adjusting 

bolt (10).

1 2

4 5

6 7

8

9

11

3

15

10

12

13

14

16

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©

 200423

2-7

General

STEERING BOX

ΧΦ65/75/85 series

7

3

Mechanical linkage
If the hydraulic power steering is cut off, the 

torque on the input shaft (2) is mechanically 

transferred to the steering rod.

The input shaft (2) and the worm shaft (12) can 

rotate in relation to each other. This rotation is 

limited by an end stop.

While steering without the hydraulic power 

steering, the steering force at the input shaft (2) is 

transferred to the worm shaft (12) by the end 

stop.

The ball curve (10) converts the rotating 

movement of the worm shaft into the linear 

movement of the piston (13). The teeth of the 

piston (13) rotate the sector shaft (11) with the 

pitman arm attached to it.

Gear backlash
Because the gearing of the sector shaft (11) and 

the piston (13) are constantly engaged when 

driving straight forward, slight wear may occur. 

This wear can cause gear backlash. To eliminate 

this gear backlash, the sector shaft can be 

adjusted axially using an adjusting bolt. The 

adjusting bolt pushes the bevelled teeth of the 

sector shaft (11) deeper into the teeth of the 

piston (13), thus eliminating any play.

The sector shaft gearing (11) is such that the 

tooth engaging the piston teeth when the steering 

box is in its central position is slightly longer than 

the other teeth.

After the play in the central position of the 

steering box has been corrected, the piston 

should be prevented from jamming in other 

positions. As a result play is perceptible outside 

the central position.

STEERING BOX

2-8

©

 200423

General

3

ΧΦ65/75/85 series

7

 

 

 

 

 

 

 

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