John Deere 6620 rubber bushings in chaffer/sieve

andy r · Oct 29, 2013

What is the best way to install the rubber bushings in the moving/supporting parts of the chaffer and sieve in a John Deere 6620?? I have one bushing that I know is gone. I know there might be a trick or two that makes the job easier. Someone told me lubricating them with soap. Should they be pressed in or pulled in with a bolt? Anyone ever done one right in the combine? Thanks.

Anonymous-0 · Oct 29, 2013

If they are the same rubber and metal bushing as my AC combine, I made a puller out of a bolt, a nut, a socket and some washers. I have also heard but have not tried to put those in a freezer for a while and they will drop right in. Don't have first hand experience with that though.

LonM · Oct 29, 2013

I have done it with the brackets on the combine and off. It is easier to do it when they are off. Then you can change them all out pretty fast. I use a little soap and just hammer them in. When you put the bolts back make sure the shoe is in the mid-point of its stroke so the rubber in the bushings is twisted the same amount forward and back as the shoe operates. Otherwise it puts too much stress on the rubber in one direction and too little when the shoe stroke reverses. If you can, it is probably a good idea to change them all. They can be worn pretty bad and not show it until its taken apart. Good luck!
Lon

MN Scott · Oct 29, 2013

I did mine with a 6 inch bench vise and two sockets. A large one, 1 1/4 and a smaller one to push the bushing out into the bigger one. To install the new bushing just use the smaller socket to push it in. The holder for the bushings is chafmered on one side to ease installation. The Deere service manual is very adamant that only water be used as an installation aid. Soap or oil can cause the bushing to rotate in its holder. If you have one bushing that shows wear I guarantee that all 26 of them need replacement. You will be surprised how bad they look when you get them pushed out. Do one bracket at a time and have your shoe centered, pitman arm on top or bottom when you tighten them down. Tighten the double nutted ones to 150 lbs and all others to 170 ft lbs.

deerefarmer · Oct 31, 2013

Just changed a set on a 6620 Titan II monday. I removed each piece one at a time and used a bench vise to press them in. I used a hammer and punch to remove the old ones. Not a major project but it will take some time. Also the deere service manual adamantly states to only use water as a lubricant but found I really had no trouble without it.

Reid1650 · Nov 24, 2013

I unbolted one side at a time on mine and just popped the old out with a bolt and sledge hammer. The new I lubed with some soft soap and with two pops from the sledge hammer the were in.

John Deere 6620 rubber bushings in chaffer/sieve

andy r

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Anonymous-0

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LonM

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MN Scott

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deerefarmer

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Reid1650

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