Hello - I am grateful for anyone who can help me track down the issue I am having. Here's the background:
x749 w/ 3cyl Yanmar Diesel @450hrs on it - Was running great for snow duty, aside from the battery being time for replacement. I serviced it last weekend with the following:
Battery (from Deere), changed oil, oil filter, air filters (inner & outer), fuel filter* and cleaned all the radiator screens, radiator fins etc. I don't think the fuel filter was EVER replaced by PO it disintegrated and end caps fell off)
*First time changing fuel filter on a diesel - learned my lesson - didn't fill up the bowl and played hell getting it to run and stay running. The Mikuni inline primer DOES NOT WORK on this machine. I can pump hundreds of times and not a single drop of fuel gets transferred to the fuel filter bowl. I wound up filling the bowl, and using a MityVac to suck fuel up to the mechanical pump inlet - there are NO air purge screws on this machine which is nonsense. As I said it took at least 45min of starting and restarting to get it running right. This was last weekend.
Fast forward to today - put new blades on the 62C deck and started mowing. Did about 2 acres with no problem. Slow, fast whatever - worked as I expected it to. However, after this, it started to die and stalled out (light cutting slow or fast - no difference) - It took about 5 restarts to get it 1000' from where I was mowing back into the shop. I have absolutely NO CLUE where to look. It *seems* to me it is running out of fuel, but why and how? I've used this to mow for years and plow in the winter with no problems...(not that it means anything)
This model, if the screens get plugged up with grass will overheat. As a result, it will shut down the PTO/mower deck until it cools. Gauge shows that it is running in the normal range, about 1:30 needle position. I am wondering if the sender/sensor is bad? There's plenty of coolant in it & the overflow. Is the defective Mikuni primer pump somehow a restriction in fuel flow all of a sudden? I never used it before and as I said it doesn't work - could the diaphragm have somehow sucked closed enough to be restrictive?
I don't know...this is all very strange. Thoughts?
Thanks a bunch!