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John Deere Tractors Discussion Forum

JD 520 Carb Removal

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07-30-2020 08:12:33

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I need to remove my 520 carb and it looks like it is sandwiched between 2 flanges and there is a tube above it that is fastened at each end by large tube nuts. It appears that the tube above it will not allow the 2 flanges to separate to remove the carb. I assume you need to loosen the large tube nuts on the tube to provide clearance to remove the carb. Correct? By the way what is the tube for?

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Mike M

07-30-2020 12:26:58

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 Re: JD 520 Carb Removal in reply to waynemo, 07-30-2020 08:12:33  
Hum ? I don't remember having much trouble at all getting those carbs. off once the fuel line was unhooked and the 8 bolts removed. It should slide right out.

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carlyle hoffman

07-30-2020 08:21:29

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 Re: JD 520 Carb Removal in reply to waynemo, 07-30-2020 08:12:33  
LUBS your ROCKER ARMS, back both FLANGE nuts up and pull tub forward no big deal

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07-30-2020 11:57:07

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 Re: JD 520 Carb Removal in reply to carlyle hoffman, 07-30-2020 08:21:29  
Hi....thanks for the reply. Do you mean to remove the tube after backing off the 2 tube end nuts and then remove the tube to get to the carb? Seems to be rather large tube just to lube rocker arms!

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07-30-2020 15:31:49

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 Re: JD 520 Carb Removal in reply to waynemo, 07-30-2020 11:57:07  
I have no idea what tube Carlyle is talking about, but the rocker arm oil line is completely hidden under the valve cover. I'm guessing the pipe you are seeing is the crank case vent pipe. It hooks to the air intake in front of the carburetor and to the ventilator pump to pull clean air into the crank case and then the contaminated air goes out the breather tube. You shouldn't have to unhook it. Never worked on a 520, but I've worked on several 60s and carburetor removal is the same. Like Mike said, unhook the fuel line, unhook the throttle/choke linkage, remove the 8 bolts and slide it out.

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Mike M

07-31-2020 06:53:46

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 Re: JD 520 Carb Removal in reply to Drew, 07-30-2020 15:31:49  
LOL ! I forgot about the throttle and choke linkages.

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07-30-2020 16:38:03

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 Re: JD 520 Carb Removal in reply to Drew, 07-30-2020 15:31:49  
Yes, you have it right. The problem to me is that the breather tube is fastened at both ends and looks like it would hold the carb tightly sandwiched between the bolt flanges. I guess you are right that I can leave it alone, you have more experience than me! It might be a few days till I get to it, I have the parts on order that I need and I will be working at the polls for the election. My problem began when the carb needle stuck partly open and the shutoff valve leaked gas all the way down to the crankcase! I drained it and put in new oil today. When the fuel line was in place, you cannot tell if the shut off valve and needle are working right. I have been having a lot of problems like this on my tractors that set a lot. One thing I found is that those shutoff valves from Briggs that are red and black and very cheap are not reliable!

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07-31-2020 05:28:32

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 Re: JD 520 Carb Removal in reply to waynemo, 07-30-2020 16:38:03  
All my two cylinders got new sediment bowls just because they can be a problem. Always shut the fuel off when tractor is not in use.

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07-31-2020 07:25:21

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 Re: JD 520 Carb Removal in reply to mdross, 07-31-2020 05:28:32  
Hi.....What problems did the sediment bowls present? Mine looks good. I always shut off fuel when tractor sets a long time. Problem I had was the shut off valve itself leaked and I did not know it when fuel line was in place. I ordered a new ball valve as a fix. Don't use those Briggs valves that are so cheap, the red and black ones! I cut one in half to see inside and there is no provision to spring load the stop and the valve only depends on manufacturing tolerances to seal and lots only do a partial job.

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