DAF LF45, LF55 Series. Manual - part 506

LF45/55 series

Removal and installation

STEERING BOX

4-1

4. REMOVAL AND INSTALLATION

4.1 REMOVAL AND INSTALLATION OF STEERING BOX ASSEMBLY

If the vehicle has been involved in a
collision, in which the steering box
or other steering gear components
(may) have been damaged, the
steering box must always be sent to
DAF for inspection or be replaced.
This requirement still applies even if
no external damage is visible. The
steering box may have sustained
internal damage in the collision,
causing it to be unreliable.

Removing steering box assembly
1.

Clean the steering box and the surrounding
area.

Place the steering gear in the central
position. This can be checked using the
marks on the steering box.

If the vehicle has a steered trailing swivel
axle, remove the angle sensor connectors
on the steering box.

Take the steering oil pipes off the steering
box. Collect the steering oil flowing out and
plug the openings of the pipes and on the
steering box, to prevent dirt entering.

Take the steering rod off the pitman arm.

Note:
If the steering rod is removed, the input
shaft must not be rotated more than 1 turn
(starting from the central position) because
otherwise the setting of the wheel-deflection
limiting valves will be changed.

Take the steering shaft off the input shaft of
the steering box.

If the vehicle has an airbag, use adhesive
tape or some other means to prevent the
steering wheel from turning.

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STEERING BOX

Removal and installation

LF45/55 series

4-2

If the steering wheel is rotated more
than 3 turns to the left or right from
the central position, this will
damage the airbag contact unit.

Ensure that the steering box is
supported securely or safely
suspended in a hoist.

Remove the steering box attachment
bolts/nuts the on the steering bracket. Take
the steering box off the vehicle.

Note:
If, in order to remove the attachment bolts,
the pitman arm must be rotated such that
the input shaft is more than one turn out of
the central position, the wheel-deflection
limiting valve stop bolts must be removed
from the steering box. This is to prevent the
sliding bush on the stop bolt from being
pushed too far onto the stop bolt.
Mark the position of the stop bolts and
make sure that they do not get mixed up
when they are replaced.

Note:
If the vehicle has a steered trailing swivel
axle, the angle of rotation of the pitman arm
must not be greater than 45

_. If the pitman

arm needs to rotate further, the steering box
angle sensor should be removed first.

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LF45/55 series

Removal and installation

STEERING BOX

4-3

Installing steering box assembly
1.

Carefully clean and inspect the threaded
holes and the stud bolt of the steering box.

If necessary, fit a new stud bolt and tighten
the stud bolt to the specified torque, see
“Technical data”.

Clean the contact surfaces of both the
steering box and steering bracket. The
contact surfaces must be absolutely free of
paint (a thin, factory-applied layer of paint is
permitted), dirt and grease.

In the case of a new or overhauled steering
box, fit the pipe connections.

Replace the attachment bolts. Because the
yield stress is exceeded when the
attachment bolts are tightened, they may
not be re-used.
Grease the new attachment bolts sparingly.
Do not apply too much lubricant. This could
result in connections coming loose.

Fit the steering box with the pitman arm to
the steering bracket.

Note:
If, in order to fit the attachment bolts, the
pitman arm has to be rotated such that the
input shaft is more than one turn out of the
central position, the wheel-deflection limiting
valve stop bolts must be removed from the
steering box. This is to prevent the sliding
bush on the stop bolt from being pushed too
far onto the stop bolt.
Mark the position of the stop bolts and
make sure that they do not get mixed up
when they are replaced.

S7 00 620

ᓻ 200322

STEERING BOX

Removal and installation

LF45/55 series

4-4

Note:
If the vehicle has a steered trailing swivel
axle, the angle of rotation of the pitman arm
must not be greater than 45

_. If the pitman

arm needs to rotate further, the steering box
angle sensor should be removed first.

Tighten the attachment bolts and nuts
evenly.
Tighten the attachment bolts to the
specified tightening torque, see “Technical
data”.

Fit the pipes to the steering box.

Fit the universal joint to the steering box
input shaft. The groove (A) in the coupling
must be aligned with the mark (B) on the
steering-box input shaft.

Check that the universal joint is
correctly in place on the input shaft
so that the attachment bolt can be
fitted in the notch (C).

10. Fit a new, original attachment nut and bolt in

the universal joint.

11. Tighten the attachment bolt to the specified

tightening torque, see “Technical data”.

12. If the vehicle has a steered trailing swivel

axle, fit the angle sensor to the steering
box.

13. Install the steering rod. Tighten the castle

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

14. Fill and bleed the steering gear.

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15. If the steering box input shaft has been

rotated more than one turn (starting from
the central position) with the steering rod
removed, the final limiting pressures must
be checked.

16. Take a test drive. During the test drive,

check that the steering gear is functioning
properly. After the test drive, check the
steering gear for leaks.

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