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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

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jdemaris

10-26-2006 13:02:57




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How do you know it is actually losing it's prime? From what you describe, you'd get similar symptoms if the fuel delivery is set lower than it was before the repair. Loss of prime does not act exactly the same as low fuel delivery. If you are losing your prime - the engine would start fine when cold - but then quit. If it just plain does not start well cold -and just smokes a little - you've probably got low fuel delivery. I used to "rebuild" the Roosamaster DB pumps in several shops. I dislike the word "rebuild" because - most often - the term "repaired" fits more closely. Most of the time, "rebuilt" pumps retain many good - but used moving parts. The wear-item parts are NOT all replaced (unlike an engine rebuild). It's kind of shame that so few people work on pumps - but don't seem to worry about pulling engines apart. The Roosamaster pumps are not very complicated, and very often only need two hours work and $40 in parts to fix. Often - sometime during the life of a tractor -someone turns up the fuel delvery, and/or increases the static (initial) timing a few degrees - all to get better cold starting and/or a little more power. I've seen - many times - where a pump goes through the shop - gets put on the test stand and calibrated back to factory specs. - and we'd then get complaints later - some legit - and some not. We did not repsond to "not enough smoke" but - bad starting machines got the fuel turned up a bit. I was lucky - that in all the shops I worked in - we usually had the tractors there in front of us - or - we got to talk to the customers. If I was reparing a pump - and found that it was turned up - I'd ask the customer about it before turning it back down. Anyway - back to your pump. If it IS losing its prime - it would start right away - just as it always did - but then quit. If the fuel-delivery is low - it will NOT start - at first - like it did before- once it is cold. And - also - if low fuel delivery is the problem - very often a small shot of ether and it takes right off and commences to run fine.

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