Summercloud
New member
I'm working on a 1986 John Deere 850 tractor with a 3 cylinder Yanmar engine.
The owners said it wouldn't start after not running it for a number years.
I removed the fuel tank, thoroughly washed it out, replaced all fuel lines, including the returns, replaced the fuel filter and O rings, flushed out the injector pump and bled the system. After a good charge, it fired up. Ran fairly even, but the acceleration and idle were erratic.
I noticed the throttle lever had been damaged and modified (cowboy tractor). So I removed the Governor inspection plate, Injector Pump and side plate. The Pump was a bit gummed up, the governor spring was chewed up from the cam gear and the governor link and lever adjustment were swinging in the wind.
Prior to reading that this pump has the makings of a Swiss watch, I disassembled it, washed it and reassembled it (using my best judgement and the increments and markings on the different parts). Bought a new spring and set up the governor as per some instructions I found posted here on TractorByNet (thanks).
It seems to run a bit better, but not as smooth idling as I would think, and it feels like it's pulling too hard under load. I suspect the adjustments of the Injector Pump is still off some what. I've searched for just some tech information, but it's like finding the Holy Grail.
Does anyone know where I can find some information on the Injector Pump rebuild settings? I could just keep pulling it and resetting and maybe get it right, but I'm afraid I going to wear out the nuts and bolts after too many tries.
The owners said it wouldn't start after not running it for a number years.
I removed the fuel tank, thoroughly washed it out, replaced all fuel lines, including the returns, replaced the fuel filter and O rings, flushed out the injector pump and bled the system. After a good charge, it fired up. Ran fairly even, but the acceleration and idle were erratic.
I noticed the throttle lever had been damaged and modified (cowboy tractor). So I removed the Governor inspection plate, Injector Pump and side plate. The Pump was a bit gummed up, the governor spring was chewed up from the cam gear and the governor link and lever adjustment were swinging in the wind.
Prior to reading that this pump has the makings of a Swiss watch, I disassembled it, washed it and reassembled it (using my best judgement and the increments and markings on the different parts). Bought a new spring and set up the governor as per some instructions I found posted here on TractorByNet (thanks).
It seems to run a bit better, but not as smooth idling as I would think, and it feels like it's pulling too hard under load. I suspect the adjustments of the Injector Pump is still off some what. I've searched for just some tech information, but it's like finding the Holy Grail.
Does anyone know where I can find some information on the Injector Pump rebuild settings? I could just keep pulling it and resetting and maybe get it right, but I'm afraid I going to wear out the nuts and bolts after too many tries.