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John Deere Tractors Discussion Forum
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Re: Help adjusting 730D pony

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Author  [Modern View]

02-07-2013 06:53:23

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Thank you. I will make sure to check each of those items as I have not taken the fuel assembly / carburetor apart previous to this.

Quoting Removed, click Modern View to see

Here is a a simplified view of the carburetor from the parts manual. Can you apply your terms "adjustment needle" / "high speed needle" to the items in the picture? I only know them by their names as given in the parts book.

By the book:

01. Needle, main jet adjusting

34. Needle, idle adjusting

36. Jet, idle

Do they have to be adjusted in a particular order?



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02-07-2013 14:36:36

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 Re: Help adjusting 730D pony in reply to raklet, 02-07-2013 06:53:23  
Tyler ...the descriptions for 34 and 36 should be reversed. 34 is not adjustable and 36 is.

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02-07-2013 15:05:39

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 Re: Help adjusting 730D pony in reply to blksmok, 02-07-2013 14:36:36  
Quoting Removed, click Modern View to see

Lol, I got the descriptions backwards. Thanks.
Ok, it appears that I still have original coils. Thy are white and waxy. I will test as instructed.
In the meantime, I removed the idle jet (34) to check it. The tube is twisted off as was mentioned. The broken off piece won't come out. How does one go about removing it?

Suggestions on where to get carb rebuild kits?



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02-07-2013 19:07:31

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 Re: Help adjusting 730D pony in reply to raklet, 02-07-2013 15:05:39 need to remove the float bowl assembly to get that broken jet out. Rebuild kits are available from JD. Make sure you have a good phenolic (dark brown) float. There are not a lot of serviceable parts in these cabs. Not sure where you'll find the broken carb jet/tube.

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02-07-2013 19:51:40

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 Re: Help adjusting 730D pony in reply to Blksmok, 02-07-2013 19:07:31  
Today must be my lucky day. I tried tapping the tube out from either end and it would not budge a bit. I was thinking I would have to go source another complete carb, so on a long shot, I took a small drill bit and started drilling into the center of the idle jet. After a few seconds, the whole thing popped out. The outer tube that it slides into (what is it called, btw?) appears to be okay. has a repair kit and also appear to have an idle jet available as a separate part. I'll call tomorrow to see what's in stock.
This post was edited by raklet at 19:52:48 02/07/13 2 times.

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02-07-2013 08:48:21

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 Re: Help adjusting 730D pony in reply to raklet, 02-07-2013 06:53:23  
When I got my 720 #34 was missing from the carb. I found one at the local Cat dealer. They had the gaskets for it and needle and seat.

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02-07-2013 07:17:07

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 Re: Help adjusting 730D pony in reply to raklet, 02-07-2013 06:53:23  
Something looks odd with item # 34. It's the fuel transfer tube and is often twisted off and broken when over tightened when a tinkerer thinks it's a mixture adjustment. As previously stated about the coil topic. A post coil and spring clip ignition wire together or a spring clip coil and a post style wire together don't work well.

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02-07-2013 08:10:21

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 Re: Help adjusting 730D pony in reply to buickanddeere, 02-07-2013 07:17:07  
Let me see if I follow so far.
#34 is non-adjustable. Clean it, install it, don't overtighten.
Only adjustments made are to #1 and #36?

How do I tell whether there are new coils or not? If I remove the resistor wire and direct jump the coils, can I damage them if they are original coils?

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02-07-2013 14:28:01

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 Re: Help adjusting 730D pony in reply to raklet, 02-07-2013 08:10:21  
Tyler...#34 has a very small hole perpendicular to the tube. It near the front of that part. Make sure it's not plugged. The "original " coils were white and kind of waxy. Replacement coils are usually black. The real shiny ones are foreign made,,the dull black ones are U.S. made..generally. The best way to check your coils is to take a new spare spark plug, detach number 1 plug wire, hook it to your spare plug, ground that plug to the engine, crank the engine and you should have a snappy blue spark. If you have spark on #1 you will also have spark on #3 as both plugs fire off of the same coil. Both plugs need to be grounded to run this test. Repeat this procedure on #2 plug to see if your other coil is good. No spark can be due to bad coils, faulty ignition switch or loose/dirty wire connections.

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Rich Duane

02-07-2013 10:09:20

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 Re: Help adjusting 730D pony in reply to raklet, 02-07-2013 08:10:21  
I thought you may have changed them but if not I doubt that the original style are still functioning. Rich

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