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Ok, so it’s not the bowl gasket or the valve stem seal, and everything is dry around all the threaded connections. I can’t imagine a lift pump having such suction as to cause cavitation bubbles. Is there an in-tank screen? Some tractors have them but they are usually a part of the sediment bowl/valve assembly.
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Hmm. You shouldn’t be seeing any air bubbles at all. Sounds like you’re sucking air somewhere. Are you using any thread sealant? How about the bowl gasket?
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It seems that you have an unusually high flow rate for an inline distributor fuel system which is usually associated with unit injector fuel systems, where fuel is used to carry away heat from the injectors. Maybe you have a by-pass back to the tank downstream of the lift pump? (I have this setup on the dozer because I have an electric lift pump and I don’t want it to “deadhead”).
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Hea Bob can you have to much turbulence in a glass bowl fuel filter to make it ineffective . The one I put on my small 20 hp is much more active(like a washing machine) than the fuel filter on my 50 hp. It spins the fuel around so much I would think it would break up any particulate or put water in solution until it made it small enough to pass thru. But there is one more screen and the spin-on filter to the engine side of this one. I would like to catch any water here. should I try to rubber mount it and see if vibration is some of the issue?
Yes. Diesel fuel and water are miscible just like hydraulic oil and water. Since the specific gravity of #2 diesel fuel is around .88, it is lighter than water and will readily settle out. Water, along with debris, will sink to the bottom of a sediment bowl. However, too high of a velocity can create a toroidal effect and become homogeneous. I think isolating vibration would have little effect to overcome that. However, if the swirling motion is enough to create a centrifugal force then the water will be thrown to the outside of the bowl and settle down the sides to the bottom. Racor filters operate on this principle of a static centrifuge.
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Tommy at Affordable Tractor Sales used to have a relocation bracket they sold, but I don’t see it listed. You might give them a call.
Circle G has a battery box they say mounts under the radiator, maybe this is what you’re looking for?
https://www.circlegtractorparts.com/body-parts/battery-box-200
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One other question, the hydraulic hoses that tilt the blade left and right came apart and they are metric, the local people say they don’t have metric fitting — any idea where I could get the correct hoses.
Circle G Tractor stocks a lot of Yuchai parts.
https://www.circlegtractorparts.com/yuchai-bulldozer-parts?limit=all
But the hoses you want appear to be out of stock.
https://www.circlegtractorparts.com/yuchai-bulldozer-parts/302l-4-57-1007-hose-for-tilting-cylinder
There appears to be other hoses that may work, but you’ll have to call to get measurements.
One other question, how do I remove the old primer?
The lift pump has a triangular bolt pattern, one at the top, two at the bottom. I would advise to remove the large nut on the face of the pump first because there is a pretty stiff spring behind it, and it will make the removal easier.
You can also get ORFS x JIC adapters, but you will need one for each end of a hose. These will allow you to convert to JIC fitted hoses. Kinda spendy though.
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thanks, I am picking up that electric pump in a few minutes and we will hook it up — are there any tricks to hooking up the pump?
Be sure there is a good filter upstream of it, if you have the sediment bowl that’s excellent.
I connected mine to the key switch, that way you don’t forget to turn it on or off. Also, be sure to fuse the circuit.
Other than making sure it’s pumping in the right direction, that’s it.
At some point you will want to remove the mechanical lift pump completely and block it off because that’s been a source of fuel dilution in the injection pump oil in the past.
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