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Tractor Talk Discussion Forum

4620 John deere

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George Weikum

11-11-2010 19:03:06

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What do you think a safe h.p. Rating would be, to turn up the diesel pump on my 4620 . It runs good, doesn"t heat up, but I would like a few more ponies. I don"t know just how much it has now, but I will have to get dyno"d. Has anyone had a power shift that you can tell me about. Thanks, GW

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11-12-2010 07:07:52

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 Re: 4620 John deere in reply to George Weikum, 11-11-2010 19:03:06  
Ours dynoed 165hp, dealer dynoed it before we bought it. No smoke, no blow by, good tight motor.

Haven't got to work it too much, pulled a 5-16's plow a little this fall. no problems.

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George Weikum

11-14-2010 07:04:52

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 Re: 4620 John deere in reply to ReedA, 11-12-2010 07:07:52  
Thank you Reed for the good picture of your 4620. What tractor is next to it. You have the right idea with all the weights, here in Illinois with the black soil we need traction. Send me email and I will send picture of my ole 4620.

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M w J

11-12-2010 05:21:47

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 Re: 4620 John deere in reply to George Weikum, 11-11-2010 19:03:06  
I think the 7020 had the same engine at about 170 HP. I had a 4620 with around 150 HP pulled 6/18 plow very well but took 13 gallon of fuel per hour. Had 8000 hours on when I traded for a 4640.Still did not use oil.

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11-12-2010 04:50:29

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 Re: 4620 John deere in reply to George Weikum, 11-11-2010 19:03:06  
There've been posts on here in the past about people running 'em at 180-200 hp for years on end, but not sure I believe it. We had 2 (syncro) back in the 70s/early 80s. The 'book' said 135 pto hp and they would dyno at that or a little better. I figured the JD engineers knew more about the capabilities of the 404 than I did and never touched the pump. They would have been a better tractor with a 466 in them........jmho. We had the rear end out of one and the original 2-spider was replaced with an upgraded 3-spider, if I remember correctly.

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11-11-2010 20:51:04

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 Re: 4620 John deere in reply to George Weikum, 11-11-2010 19:03:06  
Put a pyrometer on it before dialing the injection pump. Unless you dyno the tractor you are just guessing it's current power output. How much $$$ is in your fuel and rebuild budget?

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11-11-2010 19:45:23

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 Re: 4620 John deere in reply to George Weikum, 11-11-2010 19:03:06  
Turn it up and you will buy a premature overhaul. But if you have that kind of money, MORE POWER TO YOU.

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11-11-2010 19:38:21

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 Re: 4620 John deere in reply to George Weikum, 11-11-2010 19:03:06  
My uncle had a powershift without a cab, said it would pull anything he threw at it. But was like a sandblaster, the front wheels would bring up a little sand/dirt and the engine fan just blew it in your face. He told me he plowed with a 6-16 semi mount plow and the 4620 was a great match, was in river bottom ground with some gumbo spots. He didn't need any front end weight until he went through a gumbo spot, he'd drop a gear front end came off the ground until he got though the bad spot, once the front end came down he went up a gear and off they went. But it took fuel like you were pouring it down a rat hole, no end to the fuel it drank. chris

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11-11-2010 19:23:10

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 Re: 4620 John deere in reply to George Weikum, 11-11-2010 19:03:06  
my personal opinion your about maxed out on that 6.6 turbo engine. should be running about 135hp at PTO. Thats pretty good for a 6.6. I cant see you gettin much more without things going south on you. Id leave it alone

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