(Wurlitzer Catalogue Illustration courtesy of Q. David Bowers.)
View showing motor installed on organ ready to play. The small rectangular panel near the top of the case is for accessing and adjusting the pump stick bearings on the vacuum pump. The wider rectangular panel near the bottom of the case is for accessing and adjusting the pump stick bearings for the pressure pump. The two vertical metal plates about the same height as the worm gear box on the backside of the case are reinforcements for the bolts that hold the crankshaft bearings on the inside of the case. The small crank a little more than midway up the case is for adjusting the tempo (music roll speed).