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the only thing that makes sense to me is that you need to do a compression test ,and since you have two engines you have a good reference point. what I am thinking that your are not compressing enough to make heat to light it off until you preheat the cylinders. If this is right it would be really tuff in winter to get it to go. I assume that you have looked at the fuel and filters and screens all is good and clean.
first look at the injector pump and locate the manual primer button , they have a spring in them so when you unscrew the button it should pop up . Fill the fuel filter with diesel and replace it to the housing bracket . Loosen a bleeder at the fuel filter housing and pump the bulb to remove air once that is done push fuel one hose at a time to the injector pump from there the engine has to be turned over to push air out of the pump and lines. Cracking the injectors lines slightly will help release air also. good luck
there has been quite a few posts on the starters not getting enough amps to turn the starter up to the speed it needs to engage the ring gear. Some people am myself have added a starter relay in the start circuit . Take the small wire from the switch and use it to pull the relay. Take the large wire off the starter put it on the relay and add a strap from the relay to the starter, this worked very well for me. You depending on the relay might have to add a ground to it. This should help keep the switch in good shape as you are not running as many amps threw it.
remember about how often you have to do this to keep the excess diesel out of the pump this will extend the life of the pump but you still have a issue that one day will have to be addressed. I believe that parts for these pumps are not available here and the pump will have to be replaced. but check as all things change. Oh and a rebuild would have to be done at a diesel shop if you could get parts unless you are very qualified.
when you have the starter out take a flashlight and look at the ring gear. If your tractor has a compression release wire it open and have someone else turn the crank to inspect whole ring gear. If no compression release you can pull glow plugs or injectors or be very very careful turning engine over with the fuel cut off (engine stop) fully engaged.
I took some instructions to a Chinese restaurant and had one of the girls there help me out with what it said . good luck what you have there is quite confusing.
pulling the pto guard is not the end of the world project just put the bolts back in and your good to go, it is just the bolts have two functions, hold the shaft in place and hold the guard in place. so put the bolts back in place.
just as a bit of almost useless knowledge the old john deere model g used 30 wt engine oil in the hydro. rear 4 point lift systems. I think the idea was one oil for everything.
these tractor manf's are not loyal to any engine manf. as best as I know you could have anything on there, all I can tell you my 2006 foton 504a has a quanchi, look over the engine well there might be two tags. Maybe one on top of the valve cover , I can not remember.
