PRONAR T680, Operator'S Manual, Page: 104 / 147

Pronar T680 SECTION 5
5.6
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.
Moving the wheel try to detect slackness.
You may use a lever placed under the wheel supporting the other end
of the lever on the floor.
Repeat the procedure for each wheel individually, remembering that the jack
must be on the side opposite to the chocks.
If slackness is felt, adjust bearings. Unusual sounds coming from bearing may be symptoms
of excessive wear, dirt or damage. In such an event the bearing, together with sealing ring,
should be replaced with new parts, or cleaned and greased again During inspection of
bearings ensure that possibly detected slackness comes from the bearing and not from the
suspension system (e.g. slackness of leaf spring pins etc.).
TIP
If hub cover is damaged or missing, contamination and dampness enter the hub, which
causes significantly faster wear of bearings and hub seals.
Life of bearings is dependent on working conditions of the trailer, loading, speed of travel
and lubrication conditions.
Check condition of hub cover, if necessary replace it with a new cover. Inspection of bearing
slackness may only be conducted when the trailer is hitched to a tractor and the load box is
empty.
Check wheel axle bearings for slackness:
•
after travelling the first 1,000 km,
•
after intensive use of trailer,
•
every six months use or every 25,000 km.