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JD 520 lack of power and clutch adjustment

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russ lante

08-24-2002 17:50:07




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I have a 1958 JD 520 2 cylinder gas that has been out of commision for about a year or so. I had to replace one of the clutch linings. I finally got it all back together and now I can't seem to find the right spot to adjust the hand operated clutch to where it doesnt put a slight load on the engine when the shift lever is put into any gear.

Also even after retiming, new plugs, and cleaning out the carb bowl which contained considerable rust sediment, the tractor lacks a great deal of power. It seems as though only one cylinder is fuctioning. I have not compression tested it yet but will do so next to see if its valve related.

The tractor has had less than 100 hours on it since my previous John Deere service shop did the valve lash, tune-up and replaced the fuel gauge.

Any suggestions what to look at or where to start now? russ lante

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Steve - IN

08-24-2002 20:00:22




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 Re: JD 520 lack of power and clutch adjustment in reply to russ lante , 08-24-2002 17:50:07  
Russ,

I think Gman has pointed you in the right direction.

If the clutch disengage motion goes too far, it can effectively engage the clutch again. Usually adjusting the pulley brake to engage the pulley sooner will keep that from happening. The adjustment on the castle nuts will give you a good "snap", and lengthen the life of your clutch. I think even the owners manual will detail these two adjustments.

I'd also suspect the tank as the source of the rust. A good cleaning and a tank sealer may be in order. Also, the screen on the sediment bowl could be gummed up and need cleaning too. I've had good luck with a pump driven parts washer spaying in to a substitute gas line for a minute or two with the throttle held open and blowing out carb junk, gummed up jets, etc. Even if it doesn't work, it's worth a try; sending one to Robert's is time consuming and a bit spendy. Get all the parts cleaning solution out of the bowl afterwards.

You compression test should tell you if it's the valves, or the carb that's the culprit. Here's hoping the cheapest fix is the cause of the problem.

Steve

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Gman

08-24-2002 19:23:17




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 Re: JD 520 lack of power and clutch adjustment in reply to russ lante , 08-24-2002 17:50:07  
Rus I'll take a shot at helping you. The clutch loosen the pulley brake where it is not touching the pulley with clutch engaged,the with the clutch still engaged adjuste the three castle head nuts then disengage clutch and when you get a distinct ker-clunk on engagement you are in business then readjust pulley brake just enough where the pulley stops turning when clutch is disengaged. The power problem is probabaly plugged jets in carb,and be sure to rinse out the fuel tank and send the carb to a professional to clean,Robert's Carburetor Repair 404 E.5th St. P.O.box624 Dept. GM Spencer,IA. 51301 Ph.#1-712-262-5311 hope this helps Garland

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