Lower And Upper A-Arm Ball Pin Bushing Repair; Inspection; Stripping Down; Assembly - PREVOST H3-41 Maintenance Manual

SECTION 16 : SUSPENSION
4.12
LOWER AND UPPER A-ARM BALL PIN
BUSHING REPAIR
The assembly work may be done only by a
recognized specialized workshop. Ensure that
old and new parts do not get mixed up with each
other. For this reason, all the old parts are to be
scrapped immediately after a joint has been
stripped down. A complete repair set must be
used for each joint repaired, i.e. use of only part
of a repair set is not permissible.

4.12.1 Inspection

Take off the load from the joint by lifting the front
of the vehicle. Apply a load on the joint in all six
degrees of freedom (axial, radial, etc) with a
suitable lever bar. After the load is taken off, the
joint has to spring back into its starting position.
Free play is not acceptable.
Separation of rubber from ball pin or external
joint shell is in accordance with "normal wear
characteristics".
When the following characteristics are noted, the
joint is to be changed:
-Free play;
-Radial cracking of the external sheet-metal
race.
Ball pin
External joint shell
Radial cracking of the
sheet-metal race
FIGURE 26: BALL PIN BUSHING

4.12.2 Stripping Down

Strip down the defective joint through removal of
retaining ring, annular spacer and ball pin
bushing assembly and thereafter clean out
housing bore and locking circlips groove.

4.12.3 Assembly

Execute assembly of the new joint parts in the
following sequence:
36 PA1621 Maintenance Manual All Series | Section revised October 2018
1. Complete lubrication of the contact surface
2. Insert ball pin bushing assembly. In case of
3. Place joint in receiving fixture and mount
4. When
P artial separation
is permitted
FIGURE 27: LOWER A-ARM BALL PIN BUSHING
between housing bore and ball pin bushing
through application of the grease.
NOTE
Apply grease, only in the case of repair kit
(Prevost # 611114)).
the two-bolt type, ensure that the bolt bores
are in the correct position in relation to the
axis of the tube.
annular assembly tool on the housing.
Position annular spacer and retaining ring in
the housing using axial load of the assembly
matrix. If the ends of the annular spacer are
not in contact with each other, the opening
must be located 180° from the opening of
the retaining ring. Pay attention during
assembly to ensure that the retaining ring
eyelets are located on both sides of the
housing shaft axis (retaining ring eyelet lug
points to tube), and that retaining ring is
properly engaged in the groove of the
housing.
repairing
assemblies, the necked down-bolt must
regularly be replaced with a new one.
defective ball pin
16047