JD 310B Backhoe No Hydraulics & Fuel Injector Problems
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Thread: JD 310B Backhoe No Hydraulics & Fuel Injector Problems

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    Question JD 310B Backhoe No Hydraulics & Fuel Injector Problems

    I have a 1985 model JD 310B Backhoe that sat up for 3 years while I was sick. Now that i am over 65 and feeling better I am trying to get her back to life. I had to replace all fluids and bleed the fuel line and replace the starter and battery and finally got it to crank up today. It ran a little rough but it was nice to get it turning over. The off switch would not kill the engine but I got lucky and it finally died on its own. The throttle would not work so I assume all of this is related to the injector pump. I have no hydraulics at all so I am assuming that my hydraulic pump is stuck in some unknown position. As you can probably tell I have very little mechanic experience especially on a diesel tractor. I have managed to buy a Parts Manual but do not have a Service Manual. Any advice to test or things to try to revive this beast is much appreciated.

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    Engine not wanting to die is probably from a sticking fuel metering valve in IP or hanging up fuel control solenoid. I'd suggest adding some good fuel conditioner to tank or a quart of auto trans oil. On hyd's your unit has closed center hyd that requires oil supplied from trans pump. I'd start out by changing hyd filter & checking/cleaning sump screen(parts key 15). Also check frt hyd pump coupler to bee sure hyd pump shaft turns when engine is running.
    AR75603 Filter Element - ELEMENT,OIL FILTER ADD 8.03 USD
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    Last edited by Tx Jim; 10-21-2015 at 06:36 AM.
    flyweight and cbloom87 like this.

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    flyweight's Avatar
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    What Jim said.

    '84 JD 750
    '08 JD Z445
    '71 JD 15 Chainsaw
    And a bunch of other stuff.

    " If there's no one around to smell me, do I really stink"?
    - John Wells - Brewster County, West Texas.

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