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2023 OWNER’S MANUAL
Vortex lubrication makes changing or adding grease easy because
the hub does not need to be removed. Most axles have a threaded
grease cap, and it is easy to remove and replace.
Vortex requires Lucas Oil Marine grease, a premium lithium-
based complex grease that is fortified with rust and oxidation
inhibitors, and high-pressure additives that provide a high degree
of moisture resistance and wash-out properties.
Use only Lucas Oil Marine Grease when adding or replacing grease
in the Vortex hub. Using any other grease will void the warranty.
Adding Grease or Removing Hubs
The Vortex hub/spindle is designed to be a no-maintenance hub
for six (6) years. Remove the Vortex grease cap, unscrewing
threaded caps in a counterclockwise rotation. On the press-in
style caps, simply remove the rubber plug in the center to grease
the bearings, or knock gently with a hammer, preferably a rubber
mallet, if removing the entire hub.
Use a standard grease gun loaded with Lucas Oil Marine Grease to
pump the grease into the zerk fitting located on the end of
the spindle.
1. Pump the grease into the zerk fitting while slowly rotating the wheel.
Grease will flow out of the hub around the front bearing.
2. When the grease appears to be the new clean grease, remove the
grease gun.
3. Replace the Vortex grease cap. With the threaded cap, turn in a
clockwise rotation until the o-ring on the cap is in contact with
the hub surface. Turn an additional one-quarter (1/4) turn to seal
the Vortex cap to the hub. (Similar to installing an oil filter in an
automobile.) On the press-in style cap, tap it on until fully seated.
Be careful to avoid damaging the cap while re-installing.
If the bearings need to be adjusted or replaced, the work should be
done only by an authorized MasterCraft dealer. Failure to contact
MasterCraft for preapproval during the warranty period will void
the warranty.
The wheel bearings have been precisely torque-set at the
factory. To assure the bearings are in good working order, check
the bearing adjustment at least once a year by following this
procedure:
1. Jack up one side of the trailer. (Be certain to use jack stands and use
chocks on each of the trailer wheels to keep the trailer from moving
during the inspection.)
2. Grip the edge of the tire and see if it can be rocked or moved. If the
outer edge of the tire moves more than a small amount, the bearings
may need to be readjusted.
A slight amount of oil seepage at the rear seal is normal and
necessary to lubricate the wiper lip of the seal for long life and
sealing contaminants out. If excessive leakage is occurring
however, contact an authorized MasterCraft Dealer for assistance.
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