1943 37 (34)-207 Jointer motor

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Forum topic by pikewrench posted 10-07-2016 12:59 PM 770 views 0 times favorited 5 replies Add to Favorites Watch
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2 posts in 1157 days

10-07-2016 12:59 PM

I have owned this jointer since the mid 70s. I have been having a problem with it starting. It has an old Delta 1/2hp, 7.5 a motor. I pulled it apart and cleaned out the years of accumulation of wood dust and cleaned the armature and field. Reassembled it and plugged it up and it ran great. Shut it off and tried a restart-it will only turn slow and will not wind up if i help spin the shaft. The capacitor is an old cardboard tube type that appears to be an original and it appears to have an area saturated with the inside lubricated (yes I know that it probably contains PCBs). It has a 107-129 capacitor which I am finding that they are extremely proud of.
cheapest I have found is 38 bucks plus shipping. I believe that a 108-130 will work and will fit in the designates holder. Since I am not an electrician I want to be sure of this change. I would hate to destroy this old motor as it by far looks better manufactured than any thing you could buy today.


5 replies so far

View Bill White's profile

Bill White

5234 posts in 4520 days

#1 posted 10-07-2016 04:02 PM

Take the old cap to a motor rewind/repair shop for a replacement. They are not exotic.

-- [email protected]

View MrUnix's profile


7530 posts in 2759 days

#2 posted 10-07-2016 08:01 PM

The 108-130mfd capacitor will work just fine.


PS: If you get a higher voltage capacitor (like 220-250v), it will last longer than one rated for 125v. Just an FYI.

-- Brad in FL - In Dog I trust... everything else is questionable

View pikewrench's profile


2 posts in 1157 days

#3 posted 10-08-2016 04:21 AM

Thanks for the help, The fact that the old capacitor is old and 125 volt rated and lasted this long. I just didn’t want to put the fields or windings in jeopardy in this old motor. All the connecting wiring is braided cloth (maybe asbestos) and in real good condition. The areas of the motor had a lot of wood dust and small shaving, the armature had a black coating that looked like resin. Thanks again

Soddy Daisy, TN

View martyoc's profile


44 posts in 1477 days

#4 posted 10-08-2016 02:00 PM

I had a similar problem on my table saw motor. The problem wasn’t the capacitor, but the points on the starter switch in the motor. Once in a while I have to open the motor and clean the switch points and then it works as its supposed to. Its takes about an hour to remove the motor from the saw, open and clean it, reassemble and get back to work.

-- Marty O'C

View thor2015's profile


46 posts in 1802 days

#5 posted 10-09-2016 06:20 PM

General rule regarding capacitors is that you want to preserve your capacitance (farad rating). The voltage rating is more forgiving but you want to make sure that you find a capacitor that is the same voltage rating as the one you have or higher. NEVER go lower.

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