PRONAR T679/5, Operator'S Manual, Page: 76 / 116

PRONAR T679/5 SECTION 5
5.4
Raise the wheel (opposite to the side where chocks are placed).
Lifting jack should be positioned in the place indicated by the arrow in
figure (5.1). Lifting jack must be suitable for the weight of the trailer.
Checking wheel axle bearings for slackness
Turning the wheel slowly in both
directions check that movement is
smooth and that the wheel rotates
without excessive resistance.
Turn the wheel so that it rotates very
quickly, check that the bearing does not
make any unusual sounds.
Holding the wheel above and below, try
to feel any slackness.
You may use a lever placed under
the wheel supporting the other end of
the lever on the floor.
Lower the lifting jack, relocate the
chocks to the other wheel and repeat
the inspection procedure for the other
wheels.
TIP
If hub cover is damaged or missing, contamination and dampness enter the
hub, which causes significantly faster wear of bearing and hub seals.
Bearing life is dependent on working conditions of trailer, loading, speed of
travel and lubrication conditions.
If slackness is felt, adjust bearings. Unusual sounds coming from bearing may be symptoms
of excess wear, dirt or damage. In such a case, the bearing and sealing ring should be
replaced with new parts (if they are not suitable for further operation) or cleaned and greased
again.
FIGURE 5.2 Checking bearings for
slackness