Hi, how did your 784 start for you last winter?
Where are you, and what are the typical overnight temperatures you are trying to start it in?
I have had a 784 for about 15 years now and struggled with getting it started for years, until replacing the starter for the second time. 3 or 4 years ago we got a starter that looked like a Lucas but apparently is geared internally and spins faster and this actually turned the engine quicker than either the original Bosch or Lucas starters and it now starts quite reliably. My tractor had the ether gear stripped off of it before I got it, so the other thing I did was added a manifold pre-heater, which apparently was common on tractors shipped to some parts of Europe. You hold the key for about 25 seconds just short of the start position to warm this up and this will give you about 10 deg C colder starts. Once the temp is at or below about -10C I then plug it in. If I had to start a 784 in the cold remotely, I'd take a portable gasoline powered generator on the back of my pickup to the tractor and run the block heater for 30-45 minutes before starting it!
