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Re: JD 620 Tach drive

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Author  [Modern View]

03-03-2013 17:28:12

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Scott have you done this repair I'm wondering what it takes to replace the gears? Is the repair straight forward to do?

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Scott 730

03-03-2013 18:39:50

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 Re: JD 620 Tach drive in reply to RMOMN, 03-03-2013 17:28:12  

RMOMN said: (quoted from post at 20:28:12 03/03/13) Scott have you done this repair I'm wondering what it takes to replace the gears? Is the repair straight forward to do?

Replaced gears in my 730 diesel. I would guess the gassers would be a similar job. I had to pull the governor shaft out of the housing to replace the drive gear on the shaft. It would be wise to replace both gears. Not a good idea to mesh 1 new gear with 1 old one.
This post was edited by Scott 730 at 18:44:37 03/03/13.

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Canadian Ken

03-03-2013 18:27:34

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 Re: JD 620 Tach drive in reply to RMOMN, 03-03-2013 17:28:12  
I replaced the gear on my 720 gas

-remove the cap from the distributor
-drill a small 1/8 hole in the 2 or 2-1/4 inch welsh plug
-screw a metal screw in hole and pry out welsh plug with j bar
-remove cover from left side of governor housing
-pull governor drive gear to the left
-remove old plastic tach drive gear -grease shaft of gear assembly and install new gear
-push governor shaft in slowly to mesh plastic driven gear with teeth on governor shaft
-make sure gasket on governor is still good -or -replace with same thickness gasket/shim
-reinstall cover
-braze hole shut that was drilled in welsh plug if it is re-usable -hammer center of plug out into a concave shape
-re-install welsh plug and tighten with hammer striking center of plug
-install tach cable
-replace distributor cap


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03-03-2013 18:58:53

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 Re: JD 620 Tach drive in reply to Canadian Ken, 03-03-2013 18:27:34  
Thanks Ken and Scott that is exactly what I was looking for. Sounds like a pretty straight forward job.

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