Motor Worm Gear Removal

Silly question, but other than the overall  length they look identical... does the "broken" loco have that much more room in the trucks for a longer gear?

The mesh/mating surface appears identical, if it won't fit, it would be a lot easier to just cut the long gear straight off below the mesh point.

Rob,

I'm actually trying to fix the engine that uses the longer gear, so I need to "extend" the great on the smaller motor to be the same length as the bigger one.  I want to pull the long gear of the bad motor and put it in the good motor that has the small gear, but I'm not sure how to pull the gear off the shaft.

Is the reach really that different on two similar diesels? That the last 1/3 of the gear is the mesh point? That's a huge difference.

Good luck.  There's been a couple threads about different tools, pullers, etc.  I don't think you're going to get it off without one.  I tried to do exactly this last week, and I heated up the worm to probably 400 degrees, and had it clamped in some cloth.  Significant hammer blows to a punch on the end of the shaft inside the worm did nothing but wreck my punch.

Ended up tossing the motor and worm.  Going to buy one from MTH website

Jeff

FWIW, pulling the gear off isn't going to be easy!  I bent my gear puller after one success, I now have another hardened pin to give it another go.  You will need significant heat, I use my hot air tool set to 350C to heat them pretty well, then start cranking on the gear puller jackscrew.

Yeah, that is what I was afraid of. I did check the shorter gear motor in the e-unit and it barely caught the truck gear, so I think another option I'll try before ruining tools getting the gear off is to grind the collar to be thinner. I think just adding one or two more gear mesh connections will work. If not, it will be time for heat and tools...

Thanks for all the replies.

I think grinding the motor mount is a bad idea, but maybe that's just me.  I doubt you can grind it enough to get a decent mesh.  If you barely get the gears together, my guess is the steel worm will eat the bronze worm gear pretty quickly.

Do it right and move the worm.  If you can't do it, send it to Frank Timko, he can move it to the new motor.

I’d agree with John, grinding the motor mount is a bad idea,…complete motors are available from mthpartsandsales.com if you’d prefer to go that route……..it’s very tough to try & save a motor attempting to remove the gear. I don’t and can’t guarantee success every time I do them…..it’s usually 50/50 if the gear is gonna wreck coming off,….those gears are on there with same force that can crush submarines like soda cans….😉

Pat