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JD 40 Engine Idle

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SW

10-22-2000 12:10:53




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My JD 40 won't idle at a constant speed. If left idling, it will speed up slowly and will run at top speed. I have to reach up and push the accelerator arm back to get it to idle back down. Is this just vibration, or is it something in the linkage that can be adjusted out?




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Kerry Miller

10-22-2000 18:38:02




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 Re: JD 40 Engine Idle in reply to SW, 10-22-2000 12:10:53  
On my 50 it was the opposite, I could push the throttle forward and it would come back. I took the throttle lever assembly apart and made new friction washers out of leather cut out of the palm of 2 leather gloves. I also put in a new bolt and spring while I was there. The original friction washers looked like they were made out of the same material as brake lining.

Kerry



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clooney

10-22-2000 13:06:31




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 Re: JD 40 Engine Idle in reply to SW, 10-22-2000 12:10:53  
SW, there are friction disks on the throttle lever shaft (governor control rod) where it comes through the top of the instrument panel housing, one on each side of the housing. Those disks are probably worn out or polished smooth or the tension spring ( on the governor control rod) that preloads those disks is weak or broken. The proper way to repair your problem is to repace those disks, but you might be able to make it work better by drilling another hole in the control rod behind the old one & move the roll pin to that new hole to put more pressure on the spring that tensions those disks. The last time I put new disks in a 40 was about 1 year ago & the disks that were furnished by Deere were made from cork & as you will see they are a lot of work to put in so instead of using the cork (I didn't think they would last very long) I made new ones from brass & they worked very good & will probably out last the tractor. To remove those disks you will have to compress the tension spring first & I have found a valve spring compressor works good for that job. If you decide to tackle that repair E- mail me for a parts break down & some specifics on how to do it.

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