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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

JDB injection pump question

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Rob in Yukon

04-07-2007 13:29:44




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I have a later 70's JD440B skidder with turbo diesel and power-shift. This engine has a JDB fuel injection pump. A problem developed yesterday, where the engine would lose power then stall. It would fire up again right away but repeat the power loss then stall. I went through the trouble shooting guide and eventually found a check valve in the fuel return system, at the pump, that was full of junk. The spring and check ball were jammed. Cleaned it all out and got her running again. My question is about the check ball. It is kind of scribed from years of seating and unseating so that it doesn't close tight. Is this a big deal and should it be replaced? I think that I have had lines off of other JD engines and even other series of 440 that didn't have this check valve. The JD parts website doesn't really distinguish the check valve and only lists a fitting. Thanks

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jdemaris

04-07-2007 17:26:44




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 Re: JDB injection pump question in reply to Rob in Yukon, 04-07-2007 13:29:44  
Technically, it's purpose it as a pump-housing-pressure-regulator. The one-way check-valve operation is a side-benefit in some applications where it helps to prevent fuel-drain-back. Some other older DB pumps have the regulator built into one of the timing-window doors on the side of the pump instead. The U.S. Military had a lot of starting problems in diesel Humvees that use the same basic pump (DB2 instead of DB). Your valve is plugging because the plastic weight-retainer ring inside the pump has come apart. You can clean it out, or drill out that valve and the skidder with run for perhaps weeks, maybe months - but soon after you will ruin the pump beyond repair. To fix it - the pump has to come off, apart, and get the parts replaced or updated. Someone who has experience can take that pump apart and put it back together in one hour - and parts cost should be around $50. But, once in there you might find more parts that are half-worn and subsequently, cost some more money. Also, instead of replacing the plastic ring that failed at a cost of $5, you can update to new-style retainer for an extra $40 and it will never break again (EID type). All the pumps that are for automotive and truck use e.g. Ford-IH 6.9s/7.3s, GM 6.2s/6.5s got updated with EIDs after 1985. If you don't know anyone who knows how to fix the pump, guess you'll have to send it to somebody - or run it until it's ruined. I had a 440A skidder for years and used to have a hard time with the front axle pivot pin and housing wearing out all the time.

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Rob in Yukon

04-07-2007 19:18:41




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 Re: JDB injection pump question in reply to jdemaris, 04-07-2007 17:26:44  
Thanks, I always appreciate your experienced reply. I have about two weeks left in the winter logging season so I'll get through and then send it out. Used to have a summer gold miner friend who was retired JD mechanic but he doesn't come north anymore so I have to send it away. Thanks again.



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