Section 10: FRONT AXLE
PA1562
4
4.2 REPLACEMENT
Reverse front axle “Removal” procedure. Ensure
cleanliness of air bellows support mounting
plates.
NOTE
Refer to Section 16, ‘’Suspension’’, Section 14,
‘’Steering’’ and to paragraph 8 ‘’Specifications’’
at the end of this section for applicable checks
and recommended tightening torques.
5. SERVICE INSTRUCTIONS FOR STEER
AXLE
5.1 HUB BEARING INSPECTION
An inspection should be made at intervals of
30,000 miles (48 000 km).
• Apply parking brake, raise wheels off the
ground and support axle on stands. When
the wheels are raised, they should revolve
quite freely without roughness.
• Place magnetic base of a dial indicator on
brake caliper and position dial indicator stem
against a convenient marked spot on face of
hub flange.
• With dial indicator in position pull hard but
steadily on hub flange and oscillate at same
time until a steady reading is achieved.
• Without releasing the pressure, turn bearing
so that dial indicator stem contacts marked
spot and note reading on indicator.
• Push bearing flange hard and oscillate as
before until a steady reading is achieved.
• Without releasing the pressure, turn bearing
so that indicator stem again contacts the
marked spot and note new reading on
indicator.
• The difference between readings is the
amount of mounted end play in bearing unit.
• The mounted end play figure should not
exceed 0.050 mm (0.002”) for a new
bearing and 0.20 mm (0.008”) for a bearing
which has been in service.
NOTE
If original bearing unit is re-fitted, and end-float
is measured at 1 mm, with hub not fully
tightened to correct torque, then the retaining
clip within the unit is damaged and a new unit
must be fitted.
5.2 KING PIN INSPECTION
An inspection should be made at intervals of
30,000 miles (48 000 km).
Aspects to be considered are: Lateral slackness
and Vertical slackness.
NOTE
Before commencing checks, apply parking
brake, raise wheels off ground and support axle
on stands.
5.2.1 Checking Lateral Slackness
• While this is being carried out the brake
must be applied.
• Place a set-square with its stock on ground
and its blade against tire wall.
• Place a mark on ground to indicate position
of stock end.
• Insert a lever through bottom cut-out of
wheel and lever it upwards thus moving set-
square outwards.
• Mark changed position of stock end.
• Maximum allowable stock displacement is
given as follows: for 22.5” wheels = 8mm
(5/16”).
• If displacement exceeds stated allowance
then need for bush / bearing attention and
possible renewal, is in evidence.
5.2.2 Checking Vertical Slackness
• This is measured by a dial indicator
anchored to axle beam and having its
pointer placed vertical against swivel top.
• Place a jack against underside of swivel
and, while applying a lifting force, observe
any movement on indicator dial.
• If vertical movement is evident and it
exceeds 0.040” (1.02mm) then readjust-
ment of swivel is required by adjusting
thickness of bearing adjusting washers.
Refer to “DANA SPICER Maintenance Manual
Model NDS and Maintenance Manual NDS
Axles” annexed at the end of this section.
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