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John Deere Tractors Discussion Forum

620 Compression

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02-09-2013 15:32:14

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What should the compression be and what is considered OK?

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02-10-2013 12:35:11

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 Re: 620 Compression in reply to RMOMN, 02-09-2013 15:32:14  
Usually best to check it on a couple different occasions..you never know if you might have a little chunk of carbon trapped under a valve that could be temporary..

Pretty sure mine is around 125# in each one..

Can handle 4x16" in 2nd in some hard-pulling ground..when properly weighted..


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02-10-2013 07:31:43

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 Re: 620 Compression in reply to RMOMN, 02-09-2013 15:32:14  
My 620 has 90# on both cylinders I was told the tractor hasn't been used in over 10 years. I'm going to plow with it and see how it does

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02-09-2013 17:51:12

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 Re: 620 Compression in reply to RMOMN, 02-09-2013 15:32:14  
we have one with 100# in the left hole and 75# in the right hole and it runs good. the other one we have is sone where between 100 and 125# in each hole,dont remember the exact number now but that one was the same on each side if i remember right, it also runs very good

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Gene Hillman

02-09-2013 19:59:07

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 Re: 620 Compression in reply to johndeeregreg, 02-09-2013 17:51:12  
Well charged battery, both plugs removed, throttle and choke wide open, accurate gauge. Eveness is more important than the reading but should be within 10 percent of each other.

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