Jim: If you still haven't located the cause of your problem, here are
a couple of other possible sources you might want to check out, all of
which could cause slippage under load. First, make sure that all the
set screws on your drive gears are tight. Secondly, make sure that
your air motor is fastened down securely. Check that all the screws
holding it down are tight, and make sure that the adjustment that allows
you to vary the tilt of the body of the air motor is also tight. Let
us know how you make out.

Les Smith
lessmith@buffnet.net