2021 OWNERS MANUAL / 410
• 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:
• 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.)
• 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 nec-
essary to lubricate the wiper lip of the seal for long life and sealing
contaminants out. If excessive leakage is occurring however, con-
tact an authorized MasterCraft Dealer for assistance.
Trailers equipped with the UFP actuator will also be equipped with
a Trailer Buddy Axle utilizing the VAULT bearing protector with
specially formulated Hybrid Oil™ lubricant. The VAULT combines
the benefits of oil and grease, lubricating and protecting the wheel
bearings in a sealed pressurized chamber impenetrable by out-
side elements.
The system has a number of unique features not found on conven-
tional trailer axles. Every possible leak point on the front and rear
of the hub is sealed. The slight (3-6 psi) pressure within the VAULT
system generated inside the hub chamber will not damage the
inner oil seals. The pressure inside the hub is needed to keep water
out of the hub chamber when the hub is submerged underwater
during launch and retrieval.
Inspection or replenishment of the lubricant is not required as part
of the routine maintenance. At ambient temperatures the oil is thick,
with a viscosity approaching grease. As the bearing temperature
rises during towing, the oil thins out, replenishing the bearings with
lubricant and dissipating heat. For optimal performance, only UFP’s
Hybrid Oil Lubricant should be used in this system.
Adding or changing the lubricant in the VAULT system is neither
necessary nor recommended during the first five years of service.
After that time, the maintenance requirements should be undertak-
en only by an authorized MasterCraft dealer and only the lubricant
specified above should be used.
2021MCOwnerManualFINAL.indd 410 8/26/20 1:55 PM
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