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John Deere Tractors Discussion Forum
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4010 injectioon pump timing

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R. John Johnson

04-07-2006 14:43:31




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I've been thinking ahead to next summer and was wondering about the timing on our 4010. It does start rather hard and smokes. The pump is currently timed at TDC. I was looking in the archives and still am not sure where mine should be timed. Pump is a DBGVC631-1AJ Part Number AR-26372-R. Thanks.

John




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HTR

04-08-2006 15:35:02




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 Re: 4010 injection pump timing in reply to R. John Johnson, 04-07-2006 14:43:31  
The pump with the number ending in 1AJ, is the pump that was updated, from load advance, to speed advance. This required a new housing and a new cam ring, and replaced pump nos. ending with 4AF or 11AF. To add a little confusion the JD part no. remained the same, but parts were only available for the speed advance update.

If you have the cam ring that was supplied with the update kit, the pump times at eight degrees before top dead center. If the tractor runs reasonably well timed at TDC, somebody may have installed a cam ring that does time at TDC, like the 4020.

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msb

04-08-2006 20:51:15




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 Re: 4010 injection pump timing in reply to HTR, 04-08-2006 15:35:02  
HTR is correct.The timing window can be used to determine the location of where the 8 degree mark should go.Since the timing window is exactly the width of 4 degrees on the flywheel, use one half the width of the window,Thats how I did it for several years.Mark it with a pencil and then use a chisel to make a permanent mark.
The person who rebuilt the pump last should have updated the model number so you would know which governor weight retainer it has in the pump.

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R. John Johnson

04-09-2006 06:08:49




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 Re: 4010 injection pump timing in reply to msb, 04-08-2006 20:51:15  
I'll have to take a look at it when the cows are done calving and I have more time. I knew the 14 degree couldn't work because at 14 degrees the mark was not visible in the window. The rework was done long ago, before we bought the tractor. I'll have to post back when I physically want to start working on it.

John



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twopop

04-07-2006 17:07:06




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 Re: 4010 injectioon pump timing in reply to R. John Johnson, 04-07-2006 14:43:31  
that pump #is for the original pump on a 4010 therefore,it should be timed at 14 degrees btdc.



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