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some of these tractors have a screen inside the tank, so when you take the fuel line loose at the shut off valve and open it if you do not have good flow from the tank it could be a screen in the tank and the tank should be pumped out before you try to clean it. it would be pretty messy to try to catch it in a bucket, and remember to inspect fuel for water and any trash.
as the injection timing is concerned make sure to do your research on this before attempting to adjust factory settings. some engine injector pumps have to be shimmed to change timing. any engine can product sparks thru the exaust that is why to get forrest rated engines have spark arrestor screen on outlet side of muffler to prevent fires. usally I notice sparks when a piece of equipment is used at night, I would think this is carbon burning up, it is tuff to say over the net if you have excessive sparks coming out of exaust, I would think if the engine is running well you should be ok, if engine is running ruff then when you figure out the issue ,sparks should go to what ever is normal for that engine..
drain the hydro system before checking screen filter as it is the low point of the system so it will come out there kinda fast, it is better to do it at the drain plug.
the shuttle shifts have problems with the pins that hold the linkages together breaking this could be your issue also.
ok that is a shuttle shift, I would seperate the linkages at the transmission and operate the shifter to see if there is any binding. if all is smooth the transmission forks might be at fault. Have you tryed to move the tractor forward some distance and try reverse again? also have you checked your free play on the clutch ,it should be about 1 inch.
while it is running you might want to stick your hand under the dash and move the wires around some to see if there is needles on the gauges start jumping around. yes most likely a ground but it could be a resistance problem on the hot side.
it could be the control block but most likely it is a cylinder that is internally bypassing so it is not building the same pressures you had ,I got one on the slew on my backhoe now doing this, so off it comes and goes to the shop.
hopefully I will never need it but I will keep your repair in mind. update after a while to let whos left here know how sucessful the repair it is.
well it was kinda tuff but I did figure out what size of the internal o-ring that these couplers use 3.5 mm cross section by inside diameter of 19mm and by a outside diameter of 26.00mm ,no leaks so I guess these couplers can be resealed fairly easily. when installing remember that the hard plastic wear ring goes towards the front of the quick connect where the hose would plug in.
