PRONAR T679/3, Operator'S Manual, Page: 78 / 117

PRONAR T679/3 PRONAR T679/4 SECTION 5
5.4
Raise the wheels (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 positioned in rotation point of rocker
(1). Lifting jack must be suitable for the weight of the trailer.
Checking slackness of wheel axle bearings
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
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 bearing. 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