Another seat problem. 40 series this time.

Richard in Bee · Oct 31, 2014

The seat on my 4640 has a "bump" or "catch" in it as it glides back and forth when driving on rough ground. It is almost like there is a worn spot on one of the rails, but running my hand over them they feel smooth. I've been told that perhaps there is some junk in the way, but after taking off the front cover all I could find was a baggie from someone's sandwich and the plastic lid off a fast food drink cup.
Anyone have an idea where to start looking for the problem?

JMS/.MN · Oct 31, 2014

Does it have rollers? maybe a flat spot?

Richard in Bee · Oct 31, 2014

Not in the traditional sense. Perhaps someone on this board can tell me how it works. I've looked at the parts book and I'm still not exactly sure.

Tx Jim · Oct 31, 2014

Is this "bump" in the fore & aft or up & down mode? If fore & aft bump is possibly caused by a faulty shock absorber(parts key 7)

Or possibly a bushing(parts key 13) with a flat spot worn in it.

Richard in Bee · Oct 31, 2014

Fore and aft. About 1/3 of the way from when it gets to the front limit. Seems like the problem should be on the rails.

newgenjdcollector · Oct 31, 2014

(quoted from post at 10:24:20 10/31/14)
Fore and aft. About 1/3 of the way from when it gets to the front limit. Seems like the problem should be on the rails.

You may just have some gunk or rust on your sliders. If you remove the seat (4 bolts), you can get to the sliding mechanism and remove it. Then you can check for obstructions and worn parts--or rust. I have seen those round rods get rusty before and that can affect whether the seat slides smoothy or not. Probably something you won't see without removing.

newgenjdcollector · Oct 31, 2014

Since I conveniently had mine out already, I snapped a pic. I have it all cleaned off but it was really dusty before.

The seat slides for and aft on those rods on either side. You can also lock the shock absorber out as was mentioned above. There are no rollers are anything so inspect those rods. Sometimes a squirt of penetrating oil helps tremendously. But sometimes they get so rusted that it's best to remove them and try to polish them or simply replace them.

Richard in Bee · Oct 31, 2014

Are the rails and bushings (or whatever you want to call the things that slide on them) just metal on metal?

newgenjdcollector · Oct 31, 2014

(quoted from post at 11:29:22 10/31/14)
Are the rails and bushings (or whatever you want to call the things that slide on them) just metal on metal?

I think they are plastic bushings the rods go through.

Richard in Bee · Nov 3, 2014

I found the problem. The four bushings that slide on the rails, which Deere calls "adapters" are metal with a metal reinforced plastic insert. One of those inserts slipped out and was sliding around on the rail.
I cleaned it up, put some epoxy on it and drove it back in. Hope it stays where it is supposed to be. FYI Deere wants $90 each for these "adapters".

newgenjdcollector · Nov 3, 2014

Nice. I knew it had to be something along those lines. Your rods look nice and shiny, which is good. Never seen those bushings come out before.

Richard in Bee · Nov 3, 2014

The rods do have some rust patches on them. I'll shine them up and then lube them before putting it all back together. I suppose the friction caused by the rust spots going through the bushings could have some influence on them working their way out.

Another seat problem. 40 series this time.

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