SECTION 10: FRONT AXLE
6
DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Final Version – Rev.2 April 2016)
7. Disconnect air lines from front brake
chambers, and cover line ends and fittings to
prevent the entry of foreign matter.
CAUTION
Position the air lines and electric wires so they
will not be damaged while removing the front
axle assembly.
8. Proceed with steps a, b and c, while referring
to Section 16:
‘’Suspension’’.
a) Disconnect sway bar links from axle
brackets.
b) Remove shock absorbers.
c) Disconnect five radius rods: one
transversal and two longitudinal from
subframe, and two upper rods from axle.
9. Remove the bolts and nuts fixing the axle to
the left-hand and right-hand side air bellows
mounting supports.
10. Using the jacks, slowly lower the axle
assembly, and carefully pull away from
underneath vehicle.
4.2 REPLACEMENT
Reverse front axle “
Removal”
procedure. Ensure
cleanliness of air bellows support mounting
plates.
NOTE
Refer to Section 16: Suspension for
recommended tightening torques.
5. SERVICE INSTRUCTIONS FOR STEER
AXLE
5.1
STEERING KNUCKLE KINGPIN
INSPECTION
MAINTENANCE
An inspection should be made at intervals of
30,000 miles (48 000 km) or twice a year
whichever comes first.
Check permissible slackness in the kingpins as
follows:
Aspects to be considered are:
Lateral slackness
Vertical slackness
NOTE
Before commencing checks, apply parking
brake, raise wheels off ground and support axle
on stands.
5.1.1
Checking Lateral Slackness
Following regular and thorough greasing
practices will maximise bushing life. This
procedure measures the upper bearing & lower
bushing wear due to side and vertical loading.
While this is being carried out, the brake must
be applied.
1. Place a set-square with its stock on ground
and its blade against tire wall.
2. Place a mark on the ground to indicate
position of stock end.
3. Insert a lever through bottom cut-out of
wheel and lever it upwards thus moving set-
square outboard.
4. Mark the changed position of the stock end.
5. Maximum allowable stock displacement (for
22.5" wheels) is
0.315 in (8mm)
.
6. If displacement exceeds stated allowance
then need for bushing / bearing attention
and possible renewal, is in evidence.
NOTE
To avoid inaccurate measurements, be careful
not to let the knuckle turn while moving
assembly in and out. Applying brakes will help
lock wheel assembly.
5.1.2
Checking Vertical Slackness
1. This is measured by a dial indicator
anchored to axle beam and having its
pointer placed vertical against knuckle top.
2. Place a jack against underside of knuckle
and, while applying a lifting force, observe
any movement on indicator dial.
3.
If vertical movement is evident and it
exceeds 0.030” (0.76mm)
then readjust-
ment of knuckle is required by adjusting
thickness of bearing adjusting shims. In this
case, refer to:
Dana Parts & Service Instructions S84U
Steer Axle KING PIN REWORK_ Manual NO
1985 B iss A.
