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cations and prices subject to change without notice. Download latest update to this manual on-line.
OVERVIEW
Hub & Spindle FAQ
Q: I REMOVED MY FRONT HUB AND A SPACER FELL OFF.
WHAT IS IT?
A: J&J’s 3/4 inch spindle is cut radially. The wheel bearing needs
a
fl
at surface to work against, so a spacer is used to cover the
beveled edge of the spindle. Reinstall the spacer with the beveled
edge facing the go kart frame: a little bit of red or green thread
locker can be used to help hold the spacer in place.
Q: EVEN AFTER REPLACING THE FRONT HUB BEARINGS,
THE HUB TURNS HARD AND IS GOING THROUGH BEARINGS
QUICKLY.
A: When the bearings are replaced, it is a good idea to also replace the inner spacer that goes between them. If this
spacer becomes worn, the bearings receive too much lateral preload when the hub is tightened to the spindle. The excess
preload creates drag and causes premature bearing failure.
Front hubs and spindles: J&J pioneered the billet-machined hubs for concession go-karts. Easily-replaced lug studs are
simply threaded through the hub
fl
ange.
Sealed bearing design: two double-sealed bearings with an inner spacer make this the most popular con
fi
guration.
Tapered roller design: 1” tapered spindle and Timken®-style roller bearings and seals are used in severe conditions and on
electric go-karts where weight is a consideration. This setup requires a special hub to accommodate bearings and seals.
The spindle is fabricated from an automotive 4x4 universal joint. It is very rugged and is serviced in the same manner as
its automotive counterpart.