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| Any insight is appreciated, pump is off an 806, rebuild consisted of replacing o rings and seals, new blades and liner, new metering valve, and a new flex drive ring. We didn't touch the plungers. Before the rebuild the tractor was running fine just had issues starting. I tweaked the timing and it ran good but I had a fuel leak on backside of the pump at the cam advance plug. Took the pump off to replace those o rings and also replaced the fuel bypass hose on the side of the pump. Put the pump back on and there's no more leak but the pump is getting fuel to it but is not putting any fuel out to the injection lines, I cracked open a banjo fitting and nothing Someone said the plungers can get out of place if you turn the pump upside down, is there any truth to that? I also pulled the bypass hose off and cranked it and no fuel came out. Fuel comes out of the timing cover when I pull it off so I'm assuming fuel is getting in the pump fine. I'm completely stumped so any help is appreciated |
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east Dakota | did you wire the throttle back it wide open position when you removed the pump ? if not the govenor weights will fall out of place hence causing the metering valve to not work properly |
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| Yes I did, those weights were a little finicky to put together but I assume the pump wouldn't slide on the shaft if the weights were out of place? |
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| Take top off and make sure metering valve is moving like it should. |
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| Yes you are supposed to wire throttle open to hold weights . I never did see one fall apart . If the metering valve is working im guessing you got the eccentric ring in the primary pump backwards . If no fuel at injectors . I have seen the cam ring backwards . You will get fuel but it will be out of time so bad nothing but white smoke. There is a c and a cc on the ring . Cam
ring and primary ring should show c while facing them . I bet primary is upside down .? |
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| Sorry I realized I didn't make it clear that the tractor ran good after the pump was worked on, I took it off again to put different o rings on the cam plug to hopefully fix the leak, and I also replaced the bypass hose. put it back on and now it's not pumping fuel at all. It looks to me like the metering valve and governor linkage is moving correctly, not sure if the governor weights could get out of place and the pump still go on the shaft? |
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| Did you have the delivery valve out ? Takes
A
Special tool . Its in the pump head past the blades and springs . Are you sure you didnt get dirt in the lines and shear the pump drive . ? Take timing window off and be sure head is turning. If plungers arent stuck im suspicious pump head locked up . You did turn fuel back on at tank ?? Air all out ? |
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| No we didn't take the delivery valve out, we didn't go that far, I did take the timing window off and it is turning and fuel did come out when I took it off. Everything before the pump is bled of air. Could the plungers get stuck all of a sudden like that? 2 of the injector lines didn't break loose so the couple times before that I bled it I just did 2 or 3 and that was enough to get it started, I suppose I'll crack all the banjo fittings loose, maybe it's air locked? Still really stumped that it ran after having the pump apart and I fixed those 2 things and now I've got nothing, thanks for all the replies
Edited by elithorn 2/5/2024 07:42
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Southern Texas Panhandle | I have a new rebuilt one off of a 826 I will sell if you don't get yours to work. |
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east central Nebraska | There is no way for the plungers to get out of line. They rotate with the rotor. It sounds like there is air in the head. Remove all the nozzle lines from the nozzle end and crank it over until you have solid fuel shooting out, not just a dribble. Many times I have had to put a little air pressure in the fuel tank with a blow gun and a rag to push fuel into the plungers while cranking because it does not have a lift pump just gravity to push the fuel. Do this with the timing cover loose. Removing the cam advance plug drains fuel from the head. |
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lake Michigan shore line/Mason county | Drive shaft with dot on it is 180 out.
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| Thanks everyone for the ideas. It was just air in the pump it took forever to bleed. I'm not sure why it was so much harder to bleed than the first time but it's running now |
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Roosa Master injection pump issues after rebuild
