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Combines & Harvesters Discussion Forum

John Deere straw choppers

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10-01-2012 04:29:13

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Any 7700-7720 Deere experts on here?I need some info on the straw choppers that came on these models.Everyone around here is moving to no till planting and several of my customers have had problems planting through the thick straw that the old Fords leave with just the slingers on the rear.I have been looking at the Deere choppers for the 7700-20 series and they are exactly the same width as the Ford and drive off of the same side as the Ford.Since the Ford choppre are rarer than hens teeth I am going to put the Deere chopper on my Fords.The deere choppers and replacement parts are redily avalible new or used and seem to almost fit without much mods.I have located a chopper close by and cheap off of a 7700 but I have two questions.#1-It seems there are two styles of rotors that were made,one with bolt on knives and one with rods that hold the knives on which is the newer style?#2 can anyone tell me what rpm the choppers run at on the Deere combines?I have several chopper drive assemblies for the Fords that are almost identical to the Deere drives but have yet to find the chopper assemblies for the Ford so this is about my only option.I have been told that to run corn you just pull out the stationary knives but do you slow the chopper down on the Deere combines or does it run at the same speed as grain?Choppers are something new to me and any advice will be greatly appreciated.

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10-03-2012 18:37:02

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 Re: John Deere straw choppers in reply to haley, 10-01-2012 04:29:13  
The cross rod type are old and out dated. The bolt on hammer type are the way to go. The brackets could be made to fit a Ford easily. The chopper on a JD 7700/7720 turns at engine speed. 2400-2500 RPM

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10-01-2012 06:14:24

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 Re: John Deere straw choppers in reply to haley, 10-01-2012 04:29:13  
the one with the shafts are junk, ask any combine salvage, MF choppers are durable and should cost next to nothing if you can find one with the correct width

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10-01-2012 05:36:44

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 Re: John Deere straw choppers in reply to haley, 10-01-2012 04:29:13  

I don't know anything about JD choppers, but as a fellow ford (Claas) owner i do know about finding parts... If it looks like it might work i'd go for it... although it may take some tinkering to get everything right... My claas only has one driver speed for the chopper, if that helps you.

I made a MF 2381 flex header fit my claas 106 this summer, it did take a little work (3 days) and it does need a little modification to get it perfect, but these things can be done :-)

good luck

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10-02-2012 04:08:36

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 Re: John Deere straw choppers in reply to oj, 10-01-2012 05:36:44  
O.J., I actually have one chopper for my 642 but it needs to be totally rebuilt and from everything I can find out It was built by Ford for the combine instead of Claas.I have looked at all kinds of different knives and none are the same as the one I have.One reason I am going with the Deere chopper is that parts(new and aftermarket) are redily avalible and the chopper itself can be found in junk yards fairly cheap.

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10-01-2012 05:34:16

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 Re: John Deere straw choppers in reply to haley, 10-01-2012 04:29:13  
From my experience with a 4400.

The bolt on knives are the newer type.

As for RPM, my 4400 runs at about 2800.

Be sure to have the rotor balanced after assembling the knives. If you don't, the vibration will destroy your straw hood.

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Doug in IL

10-01-2012 05:31:25

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 Re: John Deere straw choppers in reply to haley, 10-01-2012 04:29:13  
The newer style is the one with the bolt on knives. You don't want the one with the rods. The RPM was the same, as I recall. There were after market chopper slow down kits available for them.

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