Thread Number: 71480
/ Tag: Vintage Automatic Washers
Problem with Belt Drive |
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Post# 945910 , Reply# 1   6/29/2017 at 18:32 (2,463 days old) by eddy1210 (Burnaby BC Canada)   |   | |
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Post# 945966 , Reply# 4   6/30/2017 at 07:47 (2,463 days old) by potatochips ( )   |   | |
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It's almost like it has the same frequency as the transmissions pulley. How is the set screw on it? |
Post# 945997 , Reply# 5   6/30/2017 at 10:25 (2,463 days old) by combo52 (50 Year Repair Tech Beltsville,Md)   |   | |
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Post# 946155 , Reply# 6   7/1/2017 at 00:20 (2,462 days old) by Kenmoreguy64 (Charlotte, NC)   |   | |
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I first read this thread and saw/heard the video last night, but was too tired to think up a reasonable response, then figured it was best to wait to see if John/Combo had anything to say. Seeing as he thinks its interesting too, and I had a bit more time to closely scrutinize the video, I think I may have an idea.
But first, yes, it would help to have some videos of the machine running in other cycle phases. But, from what we have now, I may be able to help narrow this issue down. I noticed that the noise stops as soon as the belt stops rotating. The basket is still spinning as it coasts to a stop, but the noise stopped, so it seems to eliminate spin bearings or most basket drive issues, and focuses us on something in the drive system that turns when the belt is turning. I don't know that any part of the pump is heavy enough to make that sort of "thick/heavy metal" knocking, so I am drawn to the transmission. If you look at the drive pulley, the knocks seem to occur when the drive pulley is in the same position, very rythmically. I have used these machines all my life, and have never come across this noise, not yet anyway. What I have heard though from a number of mid-80s machines is an agitator gear-fork knock. This is usually very light and harmless I believe, but the fork, which is what raises and lowers the agitator gear onto the agitator shaft to activate or de-activate agitation, gets wear in it after many loads and moves enough at the extreme ends of the arc that you can hear it tick or knock in its post. It basically amplifies the sounds of the other nearby metal components just a bit. Your sound is similar. In the examples of what I've heard, the gearcase only makes these knocks when under light load --- a heavy load seems to keep the parts under enough tension that they don't knock. This sound is too rapid though to be the gear fork, as it does not move this fast. What does move that fast though is the input drive shaft, on the other end of the drive pulley. It rotates really fast due to the motion provided by that wide drive pulley. It would not surprise me if we found out a couple teeth have broken on that input drive shaft, and there is enough play in the gearcase for the gear to rattle only when the gearcase is out of agitation and is essentially free-wheeling. I may end up totally off base here, but that's a hunch at this point. If you put the machine back in spin, aim your ear toward the drive pulley side of the gearcase and see if you think the noise is coming out of there. For your sake I hope not, as this is a rather invasive repair. Gordon |
Post# 946167 , Reply# 8   7/1/2017 at 04:50 (2,462 days old) by potatochips ( )   |   | |
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Hmm... I wonder if there is play in the bearing on the input drive shaft? Have you taken the pulley off and given the shaft a wiggle? |
Post# 946401 , Reply# 10   7/2/2017 at 18:43 (2,460 days old) by DADoES (TX, U.S. of A.)   |   | |
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Post# 946403 , Reply# 11   7/2/2017 at 18:57 (2,460 days old) by combo52 (50 Year Repair Tech Beltsville,Md)   |   | |
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The transmission drive pulley should be replaced, WP used these aluminum pulleys back in the 50s and then went to a steel one with a pot-metal hub, both types of pulleys that had aluminum in them often failed eventually.
WP switched production to an all steel pulley in the 70s and I never saw another failure, I have lots of steel ones around if you want me to send one let me know. |
Post# 946426 , Reply# 13   7/2/2017 at 20:36 (2,460 days old) by combo52 (50 Year Repair Tech Beltsville,Md)   |   | |
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Post# 946447 , Reply# 15   7/2/2017 at 22:26 (2,460 days old) by potatochips ( )   |   | |
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John, my Canadian machine has a spoked pulley, narrow belt, from 1985. It feels like it's aluminum, what were the barrow belt pullies made of? And is it all spoked pulleys that are aluminum? |
Post# 946512 , Reply# 16   7/3/2017 at 09:40 (2,460 days old) by combo52 (50 Year Repair Tech Beltsville,Md)   |   | |
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