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John Deere Tractors Discussion Forum
Show Parts for Model:

4020 tachometer

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Ferd

06-12-2018 18:09:51




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The tachometer on my 4020 and started jumping. I assume that itís sort of in its death throws? Is there anything I can do in the way of lube that might prolong his life? There is around 6000 hours on it.




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SVcummins

06-15-2018 11:18:17




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 Re: 4020 tachometer in reply to Ferd, 06-12-2018 18:09:51  
Might just need a new cable mine does this every so often and then the cable breaks replace the cable and itís good to go again



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72supr

06-14-2018 03:34:46




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 Re: 4020 tachometer in reply to Ferd, 06-12-2018 18:09:51  
I put a new tach in a 4000 two years ago and it lasted ninety hours .The next one ran to fast and the third one lasted just a few hours. I sent my original one to Star Speedometer he rebuilt it for two hundred forty bucks with a new cable.It is still working fine .So the three I had were pure junk.



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Greg273

06-13-2018 20:20:38




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 Re: 4020 tachometer in reply to Ferd, 06-12-2018 18:09:51  
Are the new (replacement) tachs really as bad as some say? Or is it just a gamble? The tach on my 1020 doesnt work, it'd be awfully handy to have it working again. I see the ones on this site are around $190 with cable, just wondering about the durability and quality. What drives them inside the engine? Never took one apart before.



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Tx Jim

06-13-2018 05:09:36




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 Re: 4020 tachometer in reply to Ferd, 06-12-2018 18:09:51  
Ferd
Has speed/hour meter drive cable been lubricated lately?



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Ferd

06-14-2018 11:52:12




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 Re: 4020 tachometer in reply to Tx Jim, 06-13-2018 05:09:36  
I just unhooked the cable at the dash and oiled it with some 30 weight oil. I didn't get a lot to go down the cable but it did seem to be a big improvement.



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larryanderson

06-13-2018 04:36:34




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 Re: 4020 tachometer in reply to Ferd, 06-12-2018 18:09:51  
Star Speedometer 386-569-5284 has ad in Green Magazine.I get a laugh out of people that install Mexican made replacement tach with extra digits and it says horas instead of hours and seller says it is original.



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Kansas4010

06-13-2018 03:30:41




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 Re: 4020 tachometer in reply to Ferd, 06-12-2018 18:09:51  
I heard there are places that rebuild old tachs. I would look into that before I bought a new one. I bought a new one and they are junk. They don't last and never read very accurate. That's a genuine jd replacement not an aftermarket version.



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david from kansas

06-12-2018 19:07:59




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 Re: 4020 tachometer in reply to Ferd, 06-12-2018 18:09:51  
Mine has been doing that for years, but only when RPMs are at the high end. Also, the hour meter quit years ago, at 7xxx hours.



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4520bw

06-13-2018 04:32:30




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 Re: 4020 tachometer in reply to david from kansas, 06-12-2018 19:07:59  
Ours is stuck at 6949.1 hours and has been as long as I have been driving it. (35 years). The rpms read correctly still. I have seen a bad cable cause them to that also.



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