JD 644A PAYLOADER install check valve for fuel

lenray · Mar 7, 2016

Was told this loader has the same engine found in the JD 4320 OR THE 4320 ENGINE. I want to install a check valve to keep the diesel system from draining back into the fuel tank. The fuel tank sits below the engine.
Where should I INSTALL THE CHECK VALVE???????????/ THANK YOU

Denny K · Mar 7, 2016

I didn't look up the part # in JD but it goes on the fuel filter base. When I worked for JD Ind. dealer we sold quite a few.

markct · Mar 7, 2016

It shouldn't be draining back, is it draining or you just want to put one in as a preventive measure? New hoses and checking for minor air leaks should take care of any trouble

JD Seller · Mar 7, 2016

The factory check valve was installed at the fuel filter base. I have had much better luck installing them at the fuel tank. Look at it this way. Is it easier to keep a garden hose full by holding your thumb over the top of the hose or the bottom??? The current part number is AR73888 list price of $49.77. I usually get used ones off the combines, JD 6600 or JD 7700 had them.

lenray · Mar 7, 2016

The original fuel filter has been replaced with one of those kinda square glass looking filters like are on the newer tractors..

Denny K · Mar 7, 2016

RE54244 is used on the newer base. Go to JD parts and lookup part # on where used.

NCWayne · Mar 7, 2016

If you want a cheaper, generic, valve than the one mentioned already, give Mcmaster Carr a try. The link is to a 3/8 NPT check valve, but they have other sizes, down to 1/8 NPT.

I've used them for years on quite a few different machines, and never had a problem.

As far as where to put it, either just prior to the fuel transfer pump, or right at the tank should work just fine.
Mcmaster Carr

JD Seller · Mar 7, 2016

That is a better filter system. It is much easier to bleed and change the filters on this setup. You trouble with bleeding back fuel is a air leak in the system. It can be a line or even internally in the injection pump. I have had combines that I could NOT find the leak and they would bleed off over night. So I just installed a second check valve right at the tank by the electric fuel pump. 90% of the time that solved the problem.

RBoots · Mar 8, 2016

Len, a lot of times if you just go through and replace ALL of the "olives" on the fuel lines, it will eliminate that drain back issue. Seen it a few times, where the olives look ok, but you replace them and it takes care of it.

Ross

JD 644A PAYLOADER install check valve for fuel

lenray

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Denny K

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markct

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JD Seller

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lenray

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Denny K

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NCWayne

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JD Seller

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RBoots

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