DAF CF65, CF75, CF85 Series . Manual — part 961

©

200423

3-1

Inspection and adjustment

STEERING BOX

ΧΦ65/75/85 series

7

3

3. INSPECTION AND ADJUSTMENT

3.1 INSPECTION AND ADJUSTMENT, WHEEL DEFLECTION LIMITING VALVES

Inspection of wheel deflection limiting valves
1.

Connect the pressure gauge

(DAF no. 0535653) to the delivery line using

a T-piece. Connect the T- piece as quickly as

possible to avoid air getting into the system.

Check the steering oil level in the reservoir

after connecting the T-piece and top up the

oil if required.

2.

Bleed the steering gear. To do so, run the

engine at idling speed for approx. 2 minutes,

without steering.

3.

Jack up the steerable axle(s).

4.

Warm the steering oil as described below,

until the lines are hand warm at least.

-

Set the engine speed to 1200 - 1400

rpm.

-

Activate the steering gear for 5 seconds

at its maximum, making sure that the

pressure does not exceed 50 bar.

-

Do not touch the steering wheel for 5

seconds.

-

Continue this operation until the

required temperature is reached.

Note:

If the steering oil is too cold, considerably

higher pressures will be measured.

5.

Turn the steering wheel fully left.

6.

Set the engine speed to 1200 - 1400 rpm.

7.

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.

8.

The pressure gauge will indicate the final

limiting pressure. Compare the reading with

the maximum permissible value. See

'Technical data'. If the value measured is too

high, the wheel deflection limiting valves

should be re-adjusted.

9.

Carry out the measurement once again, with

the steering wheel being turned fully to the

right.

10. Remove the jack.

11. Remove the pressure gauge.

S7 00 585

45Nm

45Nm

S7 00 565

STEERING BOX

3-2

©

200423

Inspection and adjustment

3

ΧΦ65/75/85 series

7

12. Check the steering oil level in the reservoir

after removing the pressure gauge and top

up the oil if required.

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

engine at idling speed for approx. 2 minutes,

without steering.

14. Retighten the steering wheel nut to the

specified tightening torque. See 'Technical

data'.

Adjusting the wheel deflection limiting valves
There are three adjusting procedures.

Procedure A, to be applied if:

-

a new or revised steering box is installed,

and the steering box input shaft has not been

rotated more than 1.5 turns before the

steering rod was connected to the steering

gear.

Procedure B, to be applied if:

-

the wheel deflection has been increased,

and the wheel deflection limiting valves have

not yet been adjusted according to

procedure C.

Procedure C, to be applied if:

-

the wheel deflection has been reduced.

-

the wheel deflection has been increased,

and the wheel deflection limiting valves have

already been adjusted according to

procedure C.

-

the steering box input shaft was rotated more

than 1.5 turns before the steering box with

the steering rod was connected to the

steering gear.

Note:

A steering box, whose wheel deflection limiting

valves have already been adjusted according to

procedure C, can be identified by the fact that the

factory-applied paint layer is missing from the

protruding thread of the adjusting bolt.

Adjusting according to procedure A
1.

Make sure that the steering box and the

steering bracket attachment bolts are

tightened to the specified tightening torques.

See 'Technical data'.

2.

Check the wheel deflection of the steerable

axle(s) before the steering rod is installed. If

necessary, the wheel deflection should be

adjusted using the wheel stop bolts on the

swivel axles.

3.

Install the steering rod.

©

200423

3-3

Inspection and adjustment

STEERING BOX

ΧΦ65/75/85 series

7

3

4.

Turn the steering wheel fully to the left and to

the right during a test drive.

Both wheel deflection limiting valves have

now been pushed to the right position in the

steering box piston and have adjusted

themselves.

Adjusting according to procedure B
1.

Turn the steering wheel fully to the left and to

the right during a test drive.

Both wheel deflection limiting valves have

now been pushed to the right position in the

steering box piston and have adjusted

themselves.

Adjusting according to procedure C

Note:

To adjust the wheel deflection limiting valves

the sealing plug should be replaced by an

adjusting bolt.

The required adjusting bolt (length 55 mm)

can be ordered as (DAF no. 1276448).

1.

Remove the sealing plug at the underside of

the steering box.

2.

Screw the adjusting bolt (3) which is fitted

with a lubricant seal (1) into the steering box,

until approx. 15 mm of thread protrudes from

the lock nut (2). Tighten the lock nut.

3.

Jack up the steerable axle(s) until the wheels

are clear of the floor.

4.

Remove the steering rod from the pitman

arm.

5.

Connect the pressure gauge

(DAF no. 0535653) to the delivery line using

a T-piece. Connect the T- piece as quickly as

possible to avoid air getting into the system.

Check the steering oil level in the reservoir

after connecting the T-piece and top up the

oil if required.

6.

Bleed the steering gear. To do so, run the

engine at idling speed for approx. 2 minutes,

without steering.

7.

Warm the steering oil as described below,

until the lines are hand warm at least.

-

Set the engine speed to 1200 - 1400

rpm.

-

Activate the steering gear for 5 seconds

at its maximum, making sure that the

pressure does not exceed 50 bar.

-

Do not touch the steering wheel for 5

seconds.

-

Continue this operation until the

required temperature is reached.

3

2

1

15 mm

S7 00 046

S7 00 585

STEERING BOX

3-4

©

200423

Inspection and adjustment

3

ΧΦ65/75/85 series

7

Note:

If the steering oil is too cold, considerably

higher pressures will be measured.

8.

Stop the engine.

9.

Screw the adjusting bolt (3) into the steering

box until the top of the adjusting bolt is flush

with the top of the lock nut (2).

Note:

The following actions can differ for versions

with left-hand and right-hand steering (LHD

and RHD). If so, the RHD situation is

described between brackets.

10. With the engine shut off, turn the steering

wheel fully to the right (RHD to the left) until

resistance is felt. Place a torque wrench on

the steering wheel nut and turn the steering

gear further until a tightening torque of 50

Nm is achieved.

This will press the wheel deflection limiting

valves into the "reset" position.

11. Remove the torque wrench and turn the

steering gear into the central position.

12. Fit the steering rod into the pitman arm.

13. Loosen the lock nut (2) and unscrew the

adjusting bolt 15 - 17 mm out of the lock nut.

14. Tighten the lock nut to a tightening torque of

20 - 30 Nm.

15. Start the engine and run it at idling speed.

3

2

1

S7 00 159

RHD

LHD

50Nm

S7 00 564

3

2

1

15-17 mm

S7 00 158