2017 OWNERS MANUAL / 420
dierent models, so verify the proper size with an authorized
MasterCraft dealer.
Take special care to ensure that the replacement lug nut is the
correct type and size. While the threads of the v may match, the lug
nut 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.
Ensuring that lug nuts on trailer wheels are tight and properly
torqued is an important responsibility for maintaining your trailer in
a safe operating condition. Inadequate and/or inappropriate lug nut
torque (tightness) is a major reason that lug nuts can loosen during
use. Loose lug nuts can rapidly lead to a wheel separation from the
hub, with potentially serious safety consequences.
Check the lug nut tightness often, especially during the first few
hundred miles of the trailer’s use. You should always check the
torque prior to beginning any long trip and every time a wheel is
Ensure that any product used is specifically indicated for use on
aluminum. (Many cleaners are too harsh and will result in pitting or
other damage to the wheel surface.) Many car washes use strong
chemicals and should be avoided when that is the case.
Removing road film, contaminants and brake dust (all of which
retain moisture) is critical to ensuring that the wheels will retain
their luster and quality finish for a long period of time. Any exposure
to a harsh winter climate, particularly road salt and/or chemicals, or
submersion in salt water at any time, requires immediate cleaning.
NEVER CLEAN WHEELS THAT ARE HOT.
Allow wheels to cool or cool them with running water. If the wheels
are too hot, significant damage can occur to the wheels.
removed and reset.
You must use a torque wrench to accurately indicate the amount
of torque that you are applying to the lug nut. Four-way wrenches,
ratchets, and similar tools can be useful for short-term emergency
repairs but are not appropriate tools for accurately checking lug nut
torque.
Keep a record of the date and approximate mileage when the lug
nut torque is checked. Note any lug nut(s) that lost torque. Investi-
gate the reason(s) if the lug nut torque is not maintained over more
than one retightening because this can be indicative of a possible
problem with the lug nuts, nut studs, wheels and/or hubs and that
should be corrected.
Contact an authorized MasterCraft dealer immediately if any per-
sistent lug nut loosening (or any other lug, wheel or axle problem)
occurs.
In the event of a wheel separating from the trailer during use, notify
an authorized MasterCraft dealer. Seek prompt professional as-
sistance in assessing the trailer and its gear, and retain but do not
reuse involved lug nuts, wheels and studs. Do not repair or service
the trailer yourself. Instead, call a trained, authorized MasterCraft
service technician.
Use the following pattern to tighten lug nuts. On first torquing pass
tighten to 45 ft.-lbs. On second pass tighten to 70 ft.-lbs. On third
pass tighten to 90 ft.-lbs. On fourth pass tighten to a reading be-
tween 110 ft. lbs-120 ft.-lbs. Follow the pattern shown in the photos
on the next page.
Wheels must always be cool or cold to the touch prior to cleaning.
Failure to allow wheels to cool suciently can result in damage
that is not covered under warranty.
It is also important to seal the wheels with a sealant that reduces
static and resists brake dust. Check at an automotive supply store
for an appropriate sealant.
Lug Nuts or Wheel Bolts
Loose wheel mounting nuts (lug nuts) can cause more than just an
annoying wheel wobble—it’s possible to lose a wheel. Before each
trip check for loose or missing lug nuts/wheel bolts.
Ensure that all lug nuts are secure prior towing a MasterCraft
trailer. Failure to do so can cause a wheel to disengage from the
hub. This can cause damage to the trailer that may not be covered
under warranty. Serious injury or death to the driver, any passen-
gers and/or other motorists can occur.
When tightening the lug nuts, use a correctly sized wrench. The
wrong size can round o the lug nuts and render them useless. If
you lose a lug nut, replace it promptly. The correct size varies with
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