Go BottomJD 770 sliding gear trans
 | Jeff N
Join Date: Posts: 1 
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1999-12-27 11482
Happy holidays everyone! I have a questions about JD's sliding gear transmissions thay put on their 670,770 and 970. The dealer told me that ''gear clashing'' or ginding is normal for this type of trans. Is this true? It seems to me the gears would live a short life if I had to do a lot of shifting like loader work. Most of my work 90% is mowing the lawn but when I occasionally go to shift I get this grinding noise. I also checked the owners manual for cluch play and that looks good. I hope this is a dependable type transmission? because every thing else about this tractor ,770 I like and I do not want to damage this in any way.I am the second owner and the tractor has 1200 hours on it two wheel drive with the optional continuous live trans. Any help on this would be greatly appreciated. THANKS Jeff N
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| Glenn Thompson
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1999-12-27 11522
I purchased a new John Deere Model 670 a few months ago and, like you, was unhappy about clashing gears when shifting. I read postings on this net discussing this. One person had been advised by a dealer to stop and count to 3 before shifting; another had been advised to count to 5. I tried this and it works fine for me. I stop, cut the RPMs back to about 900, count to 5, and then shift. I never seem to clash gears anymore. The only problem is that this really slows things down and I get impatient. ....
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| Randy Place
Join Date: Posts: 1
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1999-12-31 11624
I have owned a 770 4wd for six years. The transmission has no syncro's in it to allow it to shift while the tractor is in motion. You need to come to a complete stop before shifting. Grinding is especially noticable when you are shifting from forward to reverse due it the gear rotation in the transmission. Not quite so noticable when shifting from a lower gear to a higher gear. Pausing a few seconds and reducing engine speed will make a difference. As far as damage, I would not be to concerned...just don't force it into gear. It's a solid tranny and grinding of a non syncro transmission is common. Have you every driven a real old farm truck, 40 or 50's vintage? You have to double clutch or you don't shift...and even then there is grinding sometimes. You can double clutch your tractor when down shifting while the tractor is in motion. It takes a little practice if you have never done it. Shifting up through the gears is easier while the tractor is in motion, again due to the gear rotation in the tranny. Hope this helps a little. ....
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