In 15,000-miles of use (our 3000 steers 98% of the time) the only parts
that have broken are:
One (1) drive belt (it got over tightened and broke within a day)
One (1) the cogged nose piece on the motor
(the plastic pins that are driven by the motor
sheared off at about 10,000-miles)
The belts are easy to find/buy, but the nose piece is a pretty rare item. Usually you have to buy a motor assembly to get the extra nose piece.
That's what you really need at a minimum for spares.
Oriental, Bridgeton and Morehead City
all have second hand stores that might have what you need.
The belts and sometimes the nose piece can be found on E-Bay.
New Bern, NC