2016 OWNERS MANUAL / 0391
different 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 may 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
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 indicates there is something
potentially wrong 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
ruse 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 torqueing 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
at right.
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