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Chapter 5
5.11
CHECKING THE CLEARANCE OF THE AXLE BEAR-
INGS
DANGER
Before starting work, read the instructions for the lift
and follow the manufacturer's instructions.
The jack must stand firmly against the ground and
the spring plate.
Ensure that the trailer will not roll when checking the
looseness of the axle bearings.
Checking bearing looseness can only be carried out
when the trailer is connected to the tractor and the
loading box is empty and not lifted.
THE SCOPE OF ACTIVITIES
• Hitch trailer to tractor, immobilize
tractor with parking brake.
• Place the tractor and the trailer on firm
and level ground for straight driving.
• Locking wedges should be placed
under the trailer wheel opposite to
the lift wheel. Ensure that the trailer
will not roll during inspection.
• Raise the wheel (located on the op-
posite side of the placed wedges).
The jack should be placed under the
spring plate securing the road axle
to the spring - figure (5.1). The jack
must be suited to the trailer weight.
• Turn the wheel slowly in two direc-
tions. Check that the movement is
smooth and the wheel rotates without
excessive resistance and jamming -
figure (5.9).
• Turn the wheel so that it rotates very
5.14
PRONAR T679/4M
Technical inspection schedule
Figure 5.9
Clearance inspection
quickly, check that the bearing does
not make any unusual sounds.
• Try to feel looseness by moving the
wheel.
• Repeat for each wheel separately, re-
membering that the jack must be on
the opposite side of the wedges.
• If play is felt, adjust the bearings -
figure (6.3). Unnatural sounds coming
from the bearing may be symptoms
of excessive wear, dirt or damage.
In this case, the bearing together
with the sealing rings should be re-
placed or cleaned and regreased.
When checking bearings, make sure
that any noticeable looseness comes
from the bearings, not the suspension
526-I.10-1
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