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Forum Index => Dryer Repair => Topic started by: dad4taylor on January 29, 2010, 08:22:33 PM

Title: Kenmore 70 series dryer issue
Post by: dad4taylor on January 29, 2010, 08:22:33 PM
I've been having problems with my 70 series Kenmore dryer:

About 4 months ago the motor went bad so I replaced it.  While I was at it I cleaned the entire dryer exhaust.

About 1 month ago the dryer would not come on (cold) and the thermal fuse (the long white one) did not have continuity so I replaced it and the dryer worked fine.

Now the dryer works for some amount of time and then shuts off completely.  When you hit the start button you here a thud or click like the motor relay is kicking in but it does not go.  Let the dryer sit for ten minutes and it will work again.

It seems like I have some sort of heat related issue, hopefully it's not the motor.  While I was changing the motor there appeared to be some sort of device attached to the burner shroud and I may not have gotten the wires back on correctly?  I think there may also be some sort of thermostat near the thermal fuse at the back of the unit.  I'm pretty much confused at this point because I can't seem to correlate the wiring diagram with the actual hardware with regards to thermal devices.

Model 110.76722690
Title: Re: Kenmore 70 series dryer issue
Post by: JWWebster on January 29, 2010, 08:31:23 PM
It ain't gonna be the motor because that is on another circuit. How about the rollers idler and glides? Does the drum turn easy? Could their be anything causing the motor to get hot and quit?
Title: Re: Kenmore 70 series dryer issue
Post by: dad4taylor on January 29, 2010, 08:45:05 PM
The drum turns easily. The idlers appear to be ok

Your reply leads me to believe that if I had a thermal part going bad then the motor would run but the heat would be cut off?
Title: Re: Kenmore 70 series dryer issue
Post by: kellonnie on January 29, 2010, 09:01:00 PM
check the blower fan something may be stuck in there causing the motor to heat up and cut off
Title: Re: Kenmore 70 series dryer issue
Post by: JWWebster on January 29, 2010, 09:10:22 PM
You might have to check the blower housing for objects and whaile you are at it wash out the filter housing
Title: Re: Kenmore 70 series dryer issue
Post by: dad4taylor on January 29, 2010, 09:11:34 PM
Am I correct in assuming that if I have a thermal fuse or thermostat issue (not installed on or in the motor) then if one of those went bad the motor would continue to run but the dryer would not produce heat?  That would narrow it down to to the motor and/or it's ability to turn.
Title: Re: Kenmore 70 series dryer issue
Post by: JWWebster on January 29, 2010, 09:40:43 PM
cannot answer that  your model number is unknown
Title: Re: Kenmore 70 series dryer issue
Post by: dad4taylor on January 29, 2010, 09:43:50 PM
Turned the drum by hand- no issues at all.

Removed the front off the dryer and checked the Idler and rollers- I can spin them easily

Removed the back panel and blower housing- all clear and still very clean from when cleaned when the motor was replaced months ago

Checked the lint filter and lint hose- Lint hose runs about 3 feet to outside, all clear.  Lint filter clean and is always cleaned after every use

Put it all back together and am running it now to see if the disassembly/assembly shook something loose or ??? that would make things better.
Title: Re: Kenmore 70 series dryer issue
Post by: dad4taylor on January 29, 2010, 09:59:49 PM
Ahhh... there is a 110 in front of that number....

The number is shown as:  110.76722690   76722

I checked that number and it doesn't come up either.....

The wiring diagram is 3401736 rev a
Title: Re: Kenmore 70 series dryer issue
Post by: dad4taylor on January 29, 2010, 10:16:55 PM
Grrrrr......I tried to get a pic of the model sticker but it keeps coming out blurry.  Then I made a scan of the wiring diagram and the file is too big @ just under 1MB.... man I hate technology.  If we were all living in caves the sun would dry my clothes.....
Title: Re: Kenmore 70 series dryer issue
Post by: JWWebster on January 30, 2010, 12:34:07 AM
I was able to make 110.76722690 work. That dryer would not run if the skinny white fuse on the blower housing was blown but the limits on the element could blow and the dryer will still run. If the high limit(the small one on top of the heater) blows it is usually from a blocked vent.



Dryer Thermal Fuse Part # 3392519



Dryer High Limit Thermostat Part # 3403140
Title: Re: Kenmore 70 series dryer issue
Post by: AJ on January 30, 2010, 05:29:56 AM
I updated the topic to include the correct model number information, thanks!
Title: Re: Kenmore 70 series dryer issue
Post by: dad4taylor on January 30, 2010, 12:00:20 PM
So I'm not really sure where we're at here....  The only thermal device that would make the motor not run is a thermal fuse.  That sure isn't my problem because when that goes it does not come back an allow me to run the dryer ten minutes later.  Does that leave me with a bad motor or something affecting the motor in a bad way.  I am 100% sure that my vents are clear and that the idlers and wheels allow the drum to turn very freely.
Title: Re: Kenmore 70 series dryer issue
Post by: dad4taylor on January 30, 2010, 12:12:24 PM
I guess I could in theory run the dryer at a low heat setting and see if it turns off after 20 minutes... if it doesn't then my problem may not be a motor under strain but something having to do with a thermostat heating up?
Title: Re: Kenmore 70 series dryer issue
Post by: whirlpooltech on January 30, 2010, 12:12:54 PM
Is this a gas or electric dryer?
I looked up the model number and it's listed as a electric, but only shows a few diagrams and they seem to be of a gas dryer.

Quote
While I was changing the motor there appeared to be some sort of device attached to the burner shroud and I may not have gotten the wires back on correctly?



Title: Re: Kenmore 70 series dryer issue
Post by: dad4taylor on January 30, 2010, 12:32:08 PM
it is gas
Title: Re: Kenmore 70 series dryer issue
Post by: dad4taylor on January 30, 2010, 12:44:04 PM
OK, I ran the thing for 1/2 hour on low heat with nothing in it with no issues.  Then I switched to high heat and within ten minutes it cut out still with nothing in it.
Title: Re: Kenmore 70 series dryer issue
Post by: JWWebster on January 30, 2010, 12:54:56 PM
When you say it cut out you mean the motor died right?
Title: Re: Kenmore 70 series dryer issue
Post by: dad4taylor on January 30, 2010, 12:59:26 PM
Yes
Title: Re: Kenmore 70 series dryer issue
Post by: dad4taylor on January 30, 2010, 01:01:12 PM
Would it help If I sent you a scan JPG file of the wiring diagram?  It is too big to attach here.
Title: Re: Kenmore 70 series dryer issue
Post by: dad4taylor on January 30, 2010, 01:58:22 PM
Sorry, I give up guys.... heading out for new dryer
Title: Re: Kenmore 70 series dryer issue
Post by: JWWebster on January 30, 2010, 03:10:10 PM
Since you think you might have it wired wrong how about posting some pictures of the problem? Maybe we tell by looking at that.
Title: Re: Kenmore 70 series dryer issue
Post by: dad4taylor on January 30, 2010, 05:30:55 PM
Seems to me that a miswired motor would not work for 4 months...

I already bought a new dryer.... not worth my time sweating the old one

As a contractor I participate in a few online forums giving people advice and solving their issues.  I'm always trying to answer their specific question.  On this forum I asked several times about a thermal device being able to cut the motor out... simple question for somebody who knows something about appliances but nobody here could answer that.  The purpose of this forum is to answer questions and sell parts.... in that regard this forum failed.
Title: Re: Kenmore 70 series dryer issue
Post by: jumptrout51 on January 30, 2010, 06:38:58 PM
The forum did not fail.
There are no external fuses,relays,switches etc. to the motor that would cause the motor not to run as you described.
Title: Re: Kenmore 70 series dryer issue
Post by: dad4taylor on January 30, 2010, 08:25:07 PM
The appliance forum failed to answer a simple question about a popular appliance.  In addition the forum gave out incorrect information when it was stated that a blown thermal fuse would cause the motor not to turn. 
Title: Re: Kenmore 70 series dryer issue
Post by: JWWebster on January 31, 2010, 11:37:32 AM
I was able to make 110.76722690 work. That dryer would not run if the skinny white fuse on the blower housing was blown but the limits on the element could blow and the dryer will still run. If the high limit(the small one on top of the heater) blows it is usually from a blocked vent.
This statement is wrong in regards to your dryer. If the skinny white fuse blows that dryer will still run, but the power to the gas assembly will be shut down until air restrictions and lint build up is physically removed and that fuse is replaced. None of this has anything to do with the issue of the motor overload shutting down after a few minutes. The only thing I can think of that may do it is this: Some 1996-1997 dryers use a different motor. If you think your dryer was made in one of those years please double check by using your model number.
Other than that I cannot imagine why the motor would shut down if the drum is turning normally and the air restrictions have been dealt with.
Title: Re: Kenmore 70 series dryer issue
Post by: Ned120 on January 31, 2010, 05:04:21 PM
Same question, is it gas or electric?  And when you replaced the motor, was that because the drum was not revolving or an attempt to get heat?  You and I are posting around the same time, have been reviewing your thread.   The advice given on my gas dryer is working out well.  The thermal fuse was blown and the cause seems to be the massive amount of stuff in the "box heater" ( vertical chamber running up the back of the dryer, secured by 4 screws on mine).  I can't get another fuse until tomorrow or whenever I can get off work in time to get to a shop.  I replaced the $48 ignitor but that was probably not the issue.  Bypassing the fuse proved that electricity was trying to get to the ignitor ( tested at the plug that connects to the ignitor) but I'd already installed the new ignitor so could not return it.