the worm is treaded on the end for the spanner nut that holds the brake hub onto the worm. on the trust end there are 3 tapped holes for 3 hardened bolts and a lock plate that hold the thrust bearings on the worm.the thrust bearing cap applies pressure to the thrust bearing race that is adjusted by the plastic shim/gaskets. usually .002-.004" thrust end play. the ring gear lash/backlash adjustment is done with the eccentric bearing hubs on the spider typically its .006". alignment left and right is the shims on the eccentrics. these are standard tolerances for worm machines. and the reason there is not much adjustments is because the initial machining was precise. its not like a cheaper hollister- whitney machine where a rough cast is done and each component has a 1/4" of shim to make adjustments. each way has advantages. that little 22ct moves 3500# cars up to 500fpm. pretty impressive for such a small gear.

Great description. Clear and accurate. Thanks.

thanks greenpants. i will have to speak to my otis mate as this is not the description i was given although i dont think we have any geared machines going 500fpm. maybe its a machine not used here.

cheers mate thanks.

otis used these 17ct, 22ct, and 29ct machines from the early 70's on through the early 90's it replaced to #1 and #2 machines. then they went with the 18atf which is a good machine but a throw away gear box. which we don't make anymore, oops. nowadays everybody has gone gearless and they are working on a gen2 mod machine which will replace most smaller geared machines. everything else we just buy hollister-whitney.

thanks mate next time im in a otis motorroom ill check the machine label. very interesting. cheers mate have a good 1.

hey, was up ... i am located in el salvador... and i have lots of old otis controllers , relay logic..i would like to know if you could help me out with some wiring diagram... thanks