MASTERCRAFT TRAILERS
26-6
As part of the regular maintenance, keep the axle assembly properly lubricated. This procedure is best
performed by your MasterCraft dealer. The fill plug in the hub nose must be removed so that 80- to 90-
weight motor oil can be added. “Never-seize compound” is applied to the fill plug, which is re-installed and
torqued to 7-ft-lbs.
Lug Nuts or Wheel Bolts
Loose lug nuts can cause
more than just an annoying
wheel wobble–you could lose
a wheel. Before each trip check
for loose or missing lug nuts/
wheel bolts.
When tightening the lug
nuts, use the correct sized-
wrench. The wrong size can
round-off the lug nuts and ren-
der them useless. If you lose a
lug nut, replace it promptly. The
correct size varies with differ-
ent models, so you should verify
the information with your
MasterCraft dealer.
Take special care to ensure
that the replacmenent lug nut
is the correct type. While the
threads of the lug nut may match, it may be a size that
does not hold the wheel securely against the hub, even
when fully tightened. Be certain a replacement lug nut is
an exact match for the original.
Use the following pattern to tighten lug nuts. On
first torquing pass: Bring up to 45-ft-lbs. On sec-
ond pass: Bring up to 70-ft-lbs. On third pass:
Bring up to 90-ft-lbs.
Lubrication
Currently, trailers feature oil-bath bearings. Earlier models were equipped with easy lubricating hubs. How-
ever, water invades and seeps through the smallest opening. When a warm hub is submerged in cold water, any
air inside the hub will contact and draw water through the best of seals.
Trailers equipped with the Bearing Buddy II with Auto Check simplify the process of keeping watch for proper
lubrication. If the blue ring is fully extended (about 1/4-inch extruded), you have adequate lubrication. As the grease
dissipates, the ring will move back into the shell. When the blue ring is flush with the Bearing Buddy shell, it is time
to re-lubricate.
Your best protection against wheel bearing damage from the water is to always keep your wheel assembly
properly lubricated. If the wheels have been in the water, the bearings should be re-packed if the trailer remains
unused for two weeks or longer. When on a trip, make it a habit to check the wheel hubs every time you stop for
gas or refreshments. If the hub feels abnormally hot, the bearings should be inspected before continuing your trip.
Also keep the wheel bearings lubricated. Failure to do so may
cause failure and possible wheel loss, which may result in
serious injury or death or property damage.
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