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Bleeding system

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Shank

07-17-2002 10:09:21




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Just got a John Deere 310 backhoe and while changing the fuel filter I got air in the lines and it`s not getting any fuel.Can someone out there tell me how to bleed the system? Please help me out if you can.Thank you so much, Shank




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G-MAN

07-17-2002 10:55:23




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 Re: Bleeding system in reply to Shank, 07-17-2002 10:09:21  
I don't have a 310 book here, so I'll just give you some general ideas. If that 310 has the square JD filter that mounts to a base with a big clip, there should be a bleed screw at the top of the base on one side or the other - should take a 9/16 wrench or so. If it uses a different type of filter, there will be a bleed screw high on the base or filter of that style, too. Open that screw a few turns. Now go to the fuel lift pump - it will look similar to the fuel pump on a car. There should be a lever along the side of it. Pump that lever and you should see air/fuel escaping from the bleed screw you opened. If it doesn't seem to be pumping, you may have to bump the engine over a little because the camshaft may have the pump fully stroked already. Pump until pure fuel comes out and close the screw. You can pump the hand pump a little more to get some fuel in the injection pump. There is probably a bleed screw on the inj pump but I couldn't tell you where without looking at it. Go ahead and try to start the unit, it may take a little cranking but it should go in short order. If not, try loosening the lines at the inj pump and crank the engine again until you get some fuel spraying out. Close the lines and it should go.

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Shank

07-18-2002 08:28:28




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 Re: Re: Bleeding system in reply to G-MAN, 07-17-2002 10:55:23  
Thanks G-Man,I followed your instructions and it took a while,but it finally started.The RPM needle bounces around a little and it runs a little rough.Will it smooth out after a while?? Thanks again for your help, Shank.



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G-MAN

07-18-2002 10:56:24




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 Re: Re: Re: Bleeding system in reply to Shank, 07-18-2002 08:28:28  
Yes, providing it was running smoothly before, it will smooth out when all the air gets worked out of the system. You might double-check that all the connections you took loose are sufficiently tight, as if one of the high-pressure injection lines is loose enough, it will miss on that cylinder. Glad I could be of help.



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