We have a gearmotor sitting here we'd like to rebuild and get running again. All it needs is a new pinion seal which we have, along with the gasket that fits between the gear housing and motor.

Here is the gearmotor: DAYTON Gearmotor, AC, 14 RPM - Gearmotors - 6K325|6K325 - Grainger Industrial Supply

The application is a chain drive assembly in a coffee roaster that turns both the roasting drum and a rotating arm in the cooling chamber - not a lot of load, but a great deal of heat (upwards to around 450-500 degrees.)

When we split the case, we're going to lose the oil - we can try to contain what's left and reclaim it, but some has already been lost. All I can find in the specs is that it uses a "Permanent Heavy Duty Gear Oil" but doesn't go into specifics. It has a filler plug so, that implies it was meant to be filled/re-filled.

For those who might know, what would work as a suitable replacement gear lube for this unit?

Thanks in advance.

 

Those kind of gearboxes will run fine with just plain old 80-90wt gear lube, done it many times.
Just be certain you have good seals and gaskets.

 

Sweet! Thanks

That's what I was thinking, but wanted a second opinion.

I'd rep ya, but I need to "spread it around" first...

 

Is the gearbox directly in the heat, or does the chain keep it out of the worst heat?
You might try a premium synthetic gear lube over std gear lube in a higher heat application.

 

It would be located in the base of the roaster and to the rear so, it won't be seeing nearly as much heat as the topside (around the drum) - the heat up there is causing hardened bolts to turn blue...

 

Try using stainless steel bolts up there, sounds wrong but it works in our machinery.........use lots of anti-seize on the bolts.
You might try using a motor and gear box rated for hostile environments next time too.

 

This gearbox was the original that the roaster was built with - it had been replaced some time ago after the pinion seal got screwed up and we wanted to rebuild it just to have one around as a backup.

The roaster is similar to this one: Diedrich Manufacturing, Inc. - Diedrich Coffee Roasters - Coffee Roasting Equipment - it's an older model IR-12 so, there are some cosmetic differences (it's all black, for example) and it doesn't have that fancy control screen...

Thanks again.