JD 300 Industrial - Carb Problems

cig12886 · Nov 29, 2019

Good morning all! Looking for help with my 1969 John Deere
300 industrial with gas engine. Was having carb problems so I
took the carb off and cleaned it. Replaced all gaskets and
used compressed air to blow out all jets. Carb is a TSX-
904SL. After reinstalling carb the tractor fired up and idles
great! However, I cannot bring tractor up to high speed unless
the choke is on. I adjusted idle needle & load needle. Neither
adjustments seem to make a difference, choke must be on to
reach high speed. Any thoughts, ideas, tips???

Jim.ME · Nov 29, 2019

You likely still have plugged passages in your carb. It usually takes torch tip cleaners and carb cleaner at a minimum to open them up, not just blowing air through them - it doesn't always blow through. Did you adjust the float? Did you remove the plug on the bowl and check fuel flow through it to confirm there was not a supply line issue? See how long it takes to fill a pint jar, should only take a couple minutes or so.

cig12886 · Nov 29, 2019

I couldn?t remove the plug it?s seized in there. The jets and
seats are also seized in the carb. I kept it soaking overnight in
parts cleaner then blew it all out. Float was adjusted and
supply line is good. I have noticed fuel seeping out between
the bowl and upper carb. Do you think it?s possible there is a
bad seal causing an air leak?

Jim.ME · Dec 1, 2019

(quoted from post at 21:15:19 11/29/19) I couldn?t remove the plug it?s seized in there. The jets and
seats are also seized in the carb. I kept it soaking overnight in
parts cleaner then blew it all out. Float was adjusted and
supply line is good. I have noticed fuel seeping out between
the bowl and upper carb. Do you think it?s possible there is a
bad seal causing an air leak?

I have not tried it myself but have seen some postings were the person put the body parts of their carb (taken apart) in a pot and boiled them for a bit. when they cold off they were able to remove the jets, seat, and plug, you might give that a try.

I usually take a sheet of 120 or 150 emery cloth, on a flat surface, and "surface" the mating surfaces of the two main body parts. That might help with the leakage around the bowl you are seeing.

I don't know what your parts cleaner is but the fluid may not have dissolved hardened build ups in the passages. Get a set if torch tip cleaners to use in the jets and passages and a couple cans of carb cleaner.

Roger in Iowa · Dec 2, 2019

Fuel seeping between bowl and upper would be sign of float setting too high.

cig12886 · Dec 3, 2019

Thank you for the suggestions! I will let you know how I make out, unfortunately the tractor is at my vacation home & I will not be there until the New Year.

I am contemplating replacing the carb with a rebuilt unit through Steiner. I got the tractor with the house when I purchased it a year ago & would like to upgrade/update in the near future so I don't want to invest too much in to it. Assuming I can remedy the carb issue, any estimates of what the value would be on this machine?

Again thank you all for your input and help!

cig12886 · May 20, 2020

Good Morning Gents!!! Hope this finds everyone safe & healthy. Sorry it has taken me sooo long to get back here to post an update. All of your suggestions were gone through & the problem is fixed. Turns out the rebuild kit was sent with the wrong gasket thus blocking some passages. I now have full throttle range & is running smooth.

My newest question is how to adjust the idle speed?? I tried adjusting the throttle linkage but it seems like I have hit a wall. I can't lower it any further than it is and if the tach is correct, it idles at about 900-1000rpm. Is this too high?? I feel like the idle should be much lower but maybe I am more in tune with a low idling diesel.

Heading up to the house to tinker with the tractor this weekend, appreciate any pointers!!

Jim.ME · May 20, 2020

You say you are adjusting throttle linkage. Are you adjusting the throttle stop screw on the carb as well?

cig12886 · May 20, 2020

I haven't adjusted the stop screw. To make sure I am understanding exactly what screw you're referencing I attached a photo with the screw circled. I thought that screw was to limit the top end? Also, my carb has the throttle control on the opposite side than the picture. To increase the RPM the linkage moves away from the carb (in the direction of the air intake) & inversely to decrease the RPM the linkage pushes back towards the operator

[/img]

Jim.ME · May 20, 2020

(quoted from post at 07:43:13 05/20/20)
You say you are adjusting throttle linkage. Are you adjusting the throttle stop screw on the carb as well?

The high rpm limit is controlled by the governor. The screw you circled is the one to adjust to reduce the low end rpm. It sets the closed limit of the throttle plate, typical on almost every carb. You should get the Operator's and Service manuals for your tractor to help you with the maintenance and adjustments of your tractor.

cig12886 · May 20, 2020

Thank you!!! I will adjust the screw this week when I get to the house.

I have the operator's manual - didn't have much insight on the carb. I will look for the service manual that will def help. Ideally I would love to sell this one & get a newer model with a FEL. Not even sure if anyone would buy such an old machine or what it's worth.

JD 300 Industrial - Carb Problems

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