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Bearing and grease question - radial arm saw Montogomery Wards TCP 2610E

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Forum topic by KTNC posted 05-20-2018 03:35 PM 826 views 0 times favorited 4 replies Add to Favorites Watch
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KTNC

85 posts in 337 days


05-20-2018 03:35 PM

Topic tags/keywords: radial arm saw bearing replacement sealed bearing grease montogomery wards tcp 2610e motor gearbox

I’m restoring a radial arm saw Montgomery Wards TCP 2610E. See my blog for more details if interested.

http://lumberjocks.com/KTNC/blog/122441

I took the motor/gearbox apart yesterday. I need advice on two things.

1. What kind of grease is this? It’s orange in color and even though it’s probably over 40 years old it didn’t turn hard. I need to buy some, so I can replace this old grease.

2. I will replace two of the six bearings. The number stamped on the bearing is 7109. One side is sealed and one side is open. One of them had the open side exposed to the chamber that was full of dirt and sawdust. That one sounds bad and is totally dry. I’d like to get replacements that have both sides sealed. It’s easy enough to find 7109 bearings, but how do I find replacements that are sealed on both sides?


4 replies so far

View LesB's profile

LesB

1790 posts in 3524 days


#1 posted 05-20-2018 05:15 PM

Not my favorite kind of project. I replaced the bearings in my Craftsman radial arm saw a few years ago but they were both sealed and a common size. There are greases you can buy for electric motor bearings but be careful about mixing grease as they often use a different soap base (the sticky part) that are not compatible. So clean out all the old stuff and start with new. Just google “electric motor grease” to find some.
I would take the bearings to a bearing supplier so they can look them up and measure them for replacements. If you don’t have a bearing supplier near by try auto parts store or a small appliance parts; or carefully measure them yourself and search the internet. For obvious reasons try not to get bearings made in China if you have a choice.

-- Les B, Oregon

View CaptainKlutz's profile

CaptainKlutz

382 posts in 1575 days


#2 posted 05-21-2018 03:49 PM

Grease?

Looks like standard yellow/amber grease that has aged?

Many years ago there were many different types of petroleum grease, each with a unique chemistry trying to improve longevity in certain conditions. There are typically color coded to help folks know which grease was used previously, with all basic colors included (white, red, blue, yellow, green, grey/sliver).
Today, there are 3 types of grease most common: Red (high temp), Yellow (everything not high temp), and synthetic. You can buy blue & green color coded greases designed for specific applications, but only find them at auto supply or bearing supplier. There are also molybdenum modified (silver/grey) greases for anti-seize on limited movement surfaces.

IMHO – only need ONE grease to replace common red/yellow/green/white grease applications, SYNTHETIC. The synthetic greases are all high temp, high performance materials compared to petro grease; and can be used interchangeably most everywhere (except maybe marine corrosion resistant grease for salt water applications).
I stopped keeping all different kinds of grease in my shop, and now only keep a tub of synthetic from Mobile One (Valvoline, Mobil, Royal Purple all make synthetic that works about same).

Only caution I add about synthetic grease is avoid any of the molybdenum modified greases when grease is used near electronic connections (I.E. near motor brushes, switches, or wiring). Molybdenum is electrically conductive and grease “fumes” will always migrate over time; creating shorts/intermittent electrical issues.

Hope this helps.

-- I'm an engineer not a woodworker, but I can randomly find useful tools and furniture inside a pile of lumber!

View KTNC's profile

KTNC

85 posts in 337 days


#3 posted 05-22-2018 01:55 AM

LesB and CaptainKlutz: Thank you very much for the advice. It’s helped me and will probably help others later on.

I took the parts to a motor repair shop today. They are ordering me some replacement bearings that are sealed on both sides. I intend to post an update to identify them once they come in. I also asked about what kind of grease I should use. They advised me to use axle or bearing grease and that I don’t need electrical motor grease. That made sense to me as there are gears and bearings in that leftmost compartment. I already have a tub of brown colored wheel bearing grease, so I’ll use that. Maybe when I run out, I’ll get some of the synthetic stuff CaptainKlutz mentioned.

I also asked the tech to check the bearings I thought didn’t need replacing. He agreed with me except he found one more that he recommended replacing and did it on the spot. I also got to watch how he removed and installed the bearing – very interesting as this is my first time replacing bearings myself.

View KTNC's profile

KTNC

85 posts in 337 days


#4 posted 06-06-2018 03:45 AM

6/5/2018

I got the replacement bearings and reassembled the motor. See my blog for details if interested.

http://lumberjocks.com/KTNC/blog/122441

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