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8070nc 
Orange Level Access
Joined: 21 Mar 2019
Location: North Carolina
Points: 727
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 Posted: 21 Feb 2023 at 1:30pm |
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I dont see how you could drill the plate on the ttractor. I changed the piickup on my 8070 and it was plenty tight. Im guessing theb 7 and 8000 series plates are the same execpt for the pickup hole but im not sure If you could find an 8000 series plate and change it??????????
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1984 80780
1957 D14
DES 300 with 25000 engine
616 tractor
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Les Kerf
Orange Level
Joined: 08 May 2020
Location: Idaho
Points: 1641
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Posted: 21 Feb 2023 at 12:16pm |
 CrestonM wrote:
HudCo wrote:
all the grooves in the rest of the pulleys are all worn in after all these years belts all wore in a little has to change the ratio a littlle bit |
You make a point. That’s one reason I don’t care for these kinds of tachometer drive systems. |
Yup. When you get your optical tach, just mark the gauge at a couple of the most important speeds. Re-check it every year or so.
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SteveM C/IL
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Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 8989
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Posted: 21 Feb 2023 at 9:14am |
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I wonder what kind of a nightmare it would be to try to drill,thread,mount an 8000 series pickup and wire an 8000 tach? I don't have the knowledge to do it.
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CrestonM
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Joined: 08 Sep 2014
Location: Oklahoma
Points: 8482
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Posted: 21 Feb 2023 at 4:31am |
HudCo wrote:
all the grooves in the rest of the pulleys are all worn in after all these years belts all wore in a little has to change the ratio a littlle bit |
You make a point. That’s one reason I don’t care for these kinds of tachometer drive systems.
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HudCo
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Joined: 29 Jan 2013
Location: Plymouth Utah
Points: 4078
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Posted: 17 Feb 2023 at 8:19pm |
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all the grooves in the rest of the pulleys are all worn in after all these years belts all wore in a little has to change the ratio a littlle bit
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ryan(IN)
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Joined: 11 Sep 2009
Location: Bluffton,IN
Points: 792
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Posted: 17 Feb 2023 at 11:43am |
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If the pulley is the wrong diameter it will read wrong
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ryan
1984 8070 FWA,1979 7060,1975 7040,1971 190,1960 D-17D,1957 D-14, 196? D-19G, 1975 5040,1971? 160,1994 R62
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CrestonM
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Joined: 08 Sep 2014
Location: Oklahoma
Points: 8482
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Posted: 17 Feb 2023 at 8:56am |
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That sounds like a good plan! I just checked them out, got one on the way.
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SteveM C/IL
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Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 8989
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Posted: 17 Feb 2023 at 7:53am |
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get the optical tach.....they are cheap....ebay or amazon 2 yrs ago was $12...used it recently for first time on "new" tractor to check rpm
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Stan R
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Joined: 03 Dec 2009
Location: MA
Points: 999
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Posted: 17 Feb 2023 at 7:40am |
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Never used it or have it, but i-phone's have an app to measure rpm's.
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8070nc
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Joined: 21 Mar 2019
Location: North Carolina
Points: 727
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Posted: 17 Feb 2023 at 3:42am |
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You can get an optical tachometer and put white reflective tape on the dampner on the front of the crankshaft and check it. I cut a piece off the white part of DOT tape like is on trucks. Works great
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1984 80780
1957 D14
DES 300 with 25000 engine
616 tractor
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CrestonM
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Joined: 08 Sep 2014
Location: Oklahoma
Points: 8482
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Posted: 16 Feb 2023 at 10:39pm |
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Is there a good way to test a tachometer? I fixed some incorrect splicing in my wiring harness, and got the tachometer to work again on my 7080, it looks like it has the correct double pulley on the Delco alternator, and it was originally a Delco system from what I was told. Currently the tachometer reads my low idle rpm is 600, and high idle is 2,200. It is my understanding high idle should be more like 2,800. Is there a way to check and see if the fault is in the tachometer or if something is keeping the engine from reaching the proper high idle?
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