Helio O Series Owner's Manual page 34

Hub removal
Whenever the hub equipment on your axle must be removed for
inspection or maintenance the following procedure should be
performed:
1. Elevate and support the trailer unit per manufacturer's
instructions;
2. Remove the wheel;
3. Remove the grease cap by carefully prying progressively
around the flange of the cap. If the hub is an oil lube type, then
cap can be removed by unscrewing it counterclockwise while
holding the hub stationary;
4. Remove the cotter pin from the spindle nut. The cotter pin is for
single use only. As soon as it's removed, it must be replaced by
a new cotter pin;
5. Unscrew the spindle nut (counterclockwise) and remove the
spindle washer;
6. Remove the hub from the spindle, being careful not to allow
the outer bearing cone to fall out. The inner bearing cone will
be retained by the seal.
Seal inspection and replacement
Whenever the hub is removed, inspect the seal to assure that
it's not nicked or torn and is still capable of properly sealing the
bearing cavity. If there is any question of condition, replace
the seal. To replace the seal:
1. Pry the seal out of the hub with a screwdriver. Never drive the
seal out with the inner bearing as you may damage the bearing;
2. Apply a PERMATEX sealant to the outside of the new seal;
3. Tap the new seal at its place. Using a clean wood block.
Bearing Inspection and lubrification
Wash all grease and oil from the bearing cone using a suitable
solvent. Dry the bearing with a clean lint-free cloth and inspect
each roller completely. If any pitting, spalling or corrosion is
present, then the bearing must be replaced. The bearing cup
inside the hub must be inspected.
Bearings must always be replaced in sets of a cone and a cup. In
case of doubt, Hélio strongly recommends that all maintenance
and repair work be performed by qualified and competent
professionals.
When replacing the bearing cup proceed as follows:
1. Place the hub on a flat work surface with tue cup to be replaced
on the bottom side;
2. Using a brass drift punch, carefully tap around the small
diameter end of the cup to drive out;
3. After cleaning the hub bore area, replace the cup by tapping in
with the brass drift punch. Be sure the cup is seated all the way
up against the retaining shoulder in the hub.
Along with bearing adjustment, proper lubrication is essential to
the current function and reliability of your trailer axle. Bearings
should be lubricated every 6 months or 9000 km, as indicated in
Maintenance schedule chart.
1. Place a quantity of grease into the palm of your hand;
2. Press a section of the widest end of the bearing into the outer
edge of the grease pile closest to the thumb forcing grease into
the interior of the bearing;
3. Repeat while rotating the bearing from roller to roller;
4. Continue this process until you have the entire bearing
completely filled with grease ;
5. Before reinstalling, apply a light coat of grease on the bearing
cup.
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