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John Deere Tractors Discussion Forum
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Re: Does the Harmonic balancer need replacing?

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02-28-2013 15:11:43

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A fellow I know had a JD tractor that blew up because the harmonic balancer failed. I can't remember which engine or tractor model it was.

1. What does JD say about replacing it?


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02-28-2013 16:04:41

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 Re: Does the Harmonic balancer need replacing? in reply to jgc, 02-28-2013 15:11:43  
The service rep that came to the dealer I worked at said the official party line was replace them every 5000 hrs or with any major crankshaft failure. I never worried much about them unless the rubber was swelled from oil. I did rebuild a 4020 once that would break rocker arms about once a year. Then one year it broke the crankshaft. In hindsight I think the tractor was telling us the harmonic ballancer was bad. Not that the owner would listen.

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Tim S

02-28-2013 16:19:15

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 Re: Does the Harmonic balancer need replacing? in reply to ET, 02-28-2013 16:04:41  
Remember John Deere is recommending it,,and in doing so are selling parts and service,,just like the "Swap the final drive" Program....As for broken cranks,,,some times it just 'Happens'....

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02-28-2013 16:38:06

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 Re: Does the Harmonic balancer need replacing? in reply to Tim S, 02-28-2013 16:19:15  
Yes I agree they like to sell parts. Thats why I said the party line. I never put another rocker arm in that 4020 after it was rebuilt with a new crank and balancer.

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Tim S

02-28-2013 18:35:29

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 Re: Does the Harmonic balancer need replacing? in reply to ET, 02-28-2013 16:38:06  
The early 4020"s had bad rocker arms,, I can not link the balancer to the failed rocker arms....

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