to the side. If the handle opens, the hitch
ball is not the right size, shape or the latch
parts have been damaged. If the latch is
damaged, contact an authorized Master-
Craf dealer for assistance.
Lights
Before each use make certain that all trail-
er lights are in proper working order to re-
duce the risk of serious injury, death and/or
property damage.
The MasterCraft trailer harness was
specically designed to mate with O.E.M.
automotive equipment. This harness is de-
signed to disengage the trailer brakes with
the use of the tow vehicle’s O.E.M. har-
ness.
Note: See an authorized MasterCraft
dealer if the tow vehicle does not have the
correct trailer harness.
Here are a few things to do to keep the
trailer lighting system in good working or-
der:
• Be sure the white ground wire is properly
connected to the trailer frame. Replace
any parts that are damaged or worn.
• A small amount of waterproof grease on
the plug contacts and light bulb bases
will help prevent rust and corrosion.
• Before every trip, check for burned out
or broken bulbs, cracked or broken light
lenses, etc.
Hubs, Wheel Bearings,
Axles and Lubrication
UFP-equipped trailers:
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™ lu-
bricant. The VAULT combines the benets
of oil and grease, lubricating and protecting
the wheel bearings in a sealed pressurized
chamber impenetrable by outside elements.
The system has a number of unique fea-
tures not found on conventional trailer ax-
les. Every possible leak point on the front
and rear of the hub is sealed. The slight
(3-6 psi) pressure within the VAULT sys-
tem 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 sub-
merged underwater during launch and re-
trieval.
Inspection or replenishment of the lubri-
cant 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, replenish-
ing the bearings with lubricant and dissi-
pating 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 rst ve years of
MasterCraft Trailers • 2014 MasterCraft Owners Manual Page 7-13
M A S T E R C R A F T T R A I L E R S