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acplowboy45 
Silver Level
Joined: 09 May 2013
Location: connersville IN
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 Topic: 1975 AC 200
Posted: 10 May 2020 at 1:17pm |
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What is the pulley size on alternator and what is the tooth count on the tach drive, and inside alternator. Have a feeling the hour meter seems to be rolling over too fast.
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DougG
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Joined: 20 Sep 2009
Location: Mo
Points: 8266
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Posted: 10 May 2020 at 2:56pm |
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Kits for that on Ebay
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Red Bank
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Joined: 18 Apr 2018
Location: Germanton NC
Points: 1051
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Posted: 10 May 2020 at 5:23pm |
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I have been down that road and I can’t remember what the tooth count should be. I did go to harbor freight and buy a tachometer that came with reflective tape I put on the pto shaft and verified my reading was correct. The tach wasn’t all that expensive and I use it to verify all of my tractors.
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DanWi
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Joined: 18 Sep 2009
Location: wttn
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Posted: 10 May 2020 at 5:45pm |
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DJS tractor parts catalog has all the information that you should need.
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KJCHRIS
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Joined: 21 Dec 2015
Location: WC Iowa
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Posted: 11 May 2020 at 12:25pm |
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Teeth are 12 and 45.
Pulley is 3.125", #70256332
AC also used 1/2"belt dual groove , .670 bores;
3.25", #70254832.
3.50", #70260105.
3.50", #70262156.
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AC 200, CAH, AC185D bareback, AC 180D bareback, D17 III, WF. D17 Blackbar grill, NF. D15 SFW. Case 1175 CAH, Bobcat 543B,
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FREEDGUY
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Joined: 15 Apr 2017
Location: South West Mich
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Posted: 11 May 2020 at 6:27pm |
 acplowboy45 wrote:
What is the pulley size on alternator and what is the tooth count on the tach drive, and inside alternator. Have a feeling the hour meter seems to be rolling over too fast. |
Just out of curiosity, what does the tach needle show? We got a complete rear assembly for our 190 alternator from a local starter/alternator shop with "AGCO" numbers, they were for a MASSEY tach  . The needle would peg-out at 3/4 throttle  . The "MASSEY" big gear is 48 teeth.
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ranger43
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Joined: 09 Jun 2019
Location: Huntingburg
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Posted: 15 May 2020 at 5:54pm |
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If anyone ever runs into trouble with the tachometer itself, I had great luck sending them to a gentleman in Florida named Haim Zeevi. He rebuilds them. He is very professional and does excellent work. Does work for show cars and tractors as well so is very particular. He also rebuilds and reworks cables, and has other miscellaneous items to repair tachs and speedometers.
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DrAllis
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Joined: 12 Sep 2009
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Posted: 15 May 2020 at 6:11pm |
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The way those tachometers were designed to work was 1 hr was logged if the engine was ran near full throttle for an hour (rated speed 2,200 ). So, there's no way it can rack up more hrs unless the tachometer needle is buried at half throttle.
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