DAF LF45, LF55 Series. Manual — part 503

7

LF45/55 series

General

STEERING BOX

2-9

Pressure point
The sector shaft has right toothing.
Both bearing races supporting the sector shaft
are eccentrically formed.
By turning both bearing races simultaneously in
the box, the distance between the sector shaft in
relation to the piston can be changed.
When adjusting the pressure point the bearing
races are turned until the middle tooth of the
sector shaft (the largest tooth) engages the
piston toothing correctly.

Note:
Adjustment of the pressure point should only
take place in a workshop designed for this
purpose and using the required special tools.

Steering box angle sensor on version with
steered trailing swivel axle
An angle sensor (4) is fitted to the steering box
on the version with a steered trailing swivel axle
The angle sensor sends data on the steering
angle to the RAS-EC system electronic unit.

The angle sensor and the protective cover (5)
are fitted to the attachment cover (3). The carrier
(2) transfers the rotation of the sector shaft to
the angle sensor.
The carrier is connected to the sector shaft by
tension bushes (1).

1

2

3

4

5

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7

STEERING BOX

General

LF45/55 series

2-10

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7

LF45/55 series

Inspection and adjustment

STEERING BOX

3-1

3. INSPECTION AND ADJUSTMENT

3.1 INSPECTION AND ADJUSTMENT, WHEEL-DEFLECTION LIMITING VALVES

Inspecting wheel-deflection limiting valves
1.

If the vehicle has a steered trailing swivel
axle, remove the RAS-EC system fuse.

2.

Connect the pressure gauge to the T-piece
in the delivery pipe using the special tool
(DAF no. 0535653). Connect the T-piece as
quickly as possible to prevent air getting
into the system.
Check the steering oil level in the reservoir
after connecting the T-piece and top up the
oil if necessary.

Only use couplings and pipes which
are suitable for the maximum
system pressure.

3.

Bleed the steering gear.

4.

Jack up the front axle.

5.

Warm up the steering oil as described
below, until the pipes are at least warm to
the touch.
-

Set the engine speed at
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.

-

Repeat this procedure until the pipes
are at least warm to the touch.

Note:
If the steering oil is too cold, considerably
higher pressures will be measured.

6.

Turn the steering wheel fully to the left.

7.

Set the engine speed at 1200 - 1400 rpm.

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STEERING BOX

Inspection and adjustment

LF45/55 series

3-2

8.

Fit a torque wrench with a dial to the
steering wheel attachment bolt and tighten
the bolt to a tightening torque of 45 Nm on
the torque wrench.

Note:
The pressure must never exceed the
maximum permissible final limiting
pressure. If the pressure rises too high, the
valve should be reset before the
measurement is continued.

9.

The pressure gauge will indicate the final
limiting pressure. Compare the reading to
the specified value, see “Technical data”.
Do not maintain this pressure for more than
5 seconds.
If the reading is outside the specified
values, the final limiting valve should be
readjusted.

10. Carry out the measurement once again,

with the steering wheel turned fully to the
right.
The left-hand and right-hand pressures do
not need to be exactly the same.

11. Remove the jack.

12. Remove the T-piece.

13. Check the steering oil level in the reservoir

and top up if necessary.

14. Bleed the steering gear.

15. Retighten the steering wheel attachment

bolt to the specified tightening torque, see
“Technical data”.

16. If the vehicle has a steered trailing swivel

axle, fit the RAS-EC system fuse.

45Nm

45Nm

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