2016 OWNERS MANUAL / 0389
•  When the grease appears to be the new clean grease, remove the 
grease gun. 
•  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.
Wheels
Because they are often exposed to water, trailer wheels and tires re-
quire more attention than the wheels on a family vehicle. The three 
major items to check are lug nuts, lubrication and tire pressure.
Maintain the proper torque on the lug nuts attached to the wheel 
bolts. Failure to do so may result in serious injury or death and/or 
property damage. An authorized MasterCraft dealer can provide 
the proper torque specifications (measured in foot-pounds).
Keep the wheel bearings lubricated. Inspect the wheel bearings 
for proper lubrication before each use. Failure to do so may cause 
wheel failure and possible wheel loss, which may result in serious 
injury or death and/ or property damage.
Aluminum wheels also require attention to routine maintenance, 
particularly in keeping them clean. Failure to do so may result in 
damage that is not covered by warranty.
The trailer and wheels should be washed weekly during boating 
season, and after every use if the trailer has been submerged in 
salt or brackish water. Use a soft brush, mild detergent and/or mild 
degreaser. A quality spray-on wheel cleaner may also be used.