1973 Frigidaire 1-18 Dryer: Kingston Timer Motor Parts

[drh4683]

Back in January, 2014, I purchased and installed one of those brass armature drive gears for a Kingston model 60 timer motor from Dave Harnish for use in my 1973 Frigidaire dryer (WIA3T), as it suffered from the usual broken plastic drive gear at the time. My 1-18 set has been serving me well as my main drivers since then, but the dryer timer motor suffered another breakdown as of this weekend as it stopped advancing. I pulled the motor apart, and this time the failure was a couple of broken teeth on one of the larger plastic gears as shown in my pics. This broken gear is not the fault of Dave's brass replacement gear (in fact, the brass gear doesn't even mesh with the gear that broke here). Are parts available to fix these other internal plastic gears? I looked on ebay for a parts unit, and noticed other Kingston timers for sale that have the same output shaft as my original motor. The big difference I see is what appears to be the number of gear/axle pins on the timer motors. I have 5 axle pins on my original motor, where as I see typically 4 axle pins on the ones on ebay (see photos which point this out). Not sure if these "4-pin" motors can be used, if the output torque is different based on the gearing, or if its just for directional change or what. Actually, there is a little pawl under one of the gears in my motor so that the motor is mechanically forced to rotate in only one direction (since a synchronous AC motor can start to rotate in either direction when its powered up). I imagine all variations of these Kingston model 60 are 1 RPM regardless of how they are geared. I'd like to find a replacement gear for mine to keep the original motor alive. Any insight on these other motor variations or available parts is appreciated!

 

[maytag142c]

What model timer is that by chance ? I have a few kicking around that look similar.

 

[maytag142c]

Here is a motor that I have

 

[drh4683]

That's exactly it! Are you interested in selling it? Thanks!

 

[drh4683]

Mike kindly sold me this spare timer motor. Thanks again, Mike!

I'm learning a bit more about these Kingston timers. Apparently mine is a 1/3 RPM unit, which explains the 5th gear. The 4-gear timers I've seen on eBay are all 1 RPM.
The metal cases are stamped to designate the output, "1R" = 1RPM and "1/3R" = 1/3 RPM.

 

[qsd-dan]

Mikes timer motor is stamped 2/3R so it's going to run 100% faster than your 1/3R timer.

 

[swestoyz]

9948015/5309948015 timer motor for DIA3T

Not sure if this helps, Doug, in case you go the route of looking for an OE GM part. I was unable to uncover any 9948015 timer motors at the popular spots online.

Seems GM used both of these two timer motors variations for the entirety of the 1-18 dryer run from 1970-1979, outside of the rapid advance timer for the '79 DEEG model.

Ben

 

[drh4683]

Thanks for the screen shot with part numbers, Ben! I will take note of that for future reference.

Regarding Mikes timer motor, that is indeed the wrong one for my application. I failed to see his was marked as a 2/3R motor, so thanks for pointing that out. I was looking at the axle arrangement only which was the same as mine. Who knows, perhaps the specific gear I need might be the same in the 2/3 motor. Unfortunately Mike didn't have any 1/3 types. I emailed Dave Harnish at davesrepair and he said he has drawers full of Kingston parts units and will check it out for me. If all else fails, I have to take one of these other timers apart and see if I get lucky that the gear I need has a 10x50 tooth count.

 

[drh4683]

Problem solved

I bought one of the more common 1-RPM Kingston timer motors off eBay to take apart and see how it compared to my 1/3 RPM unit. I figured the gear trains should be very similar for the sake of reducing production costs and that ended up being the case. Both gear trains are identical in arrangement and size except for the addition of the speed reducing pinion (gear "B") on my failed 1/3 motor. I don't have to worry about gear "B" since it's fine, but all the others are the same and gear "D" was the broken one in this situation. On a side note, the typically broken plastic armature gear was in fact broken on the eBay parts motor even though it was supposedly "tested and working", but that of course didn't matter here. At any rate, I'm back in business now. Here's a few more photos of the details comparing the two motors for future reference. I imagine the 2/3 RPM motor will also be the same except for a different gear "B" as well. Also for the record, I wanted to correct my dryer model number for which this 1/3 RPM motor fits. it's a Frigidaire DIAG3T. I gave the model number to my washer in the first post by mistake... Thanks everyone!

 

[qsd-dan]

Great post!

Very convenient to know similar gears exist between other motors. If one had a dud 1 RPM motor and had a spare 1/3 RPM on hand, they could crack open the 1/3, remove the extra gear, and be in business again.

Now I regret tossing failed Kingston timer and timer motors I replaced in the past.