Posted by tarment10 on November 04, 2023 at 17:40:10 from (76.37.218.2):
In Reply to: IH 300u problems posted by tarment10 on October 20, 2023 at 12:26:24:
Hopefully a final update here. I figured out what the issue is and I'm pretty sure I fixed it. Just wanted to post on here in case anyone else runs into the same issue.
To recap, the tractor's ignition timing was changing for seemingly inexplicable reasons. I first noticed it while attempting to brush hog a field shortly after buying the tractor. I fixed the timing and then went to hook up to the brush hog again, but this time the engine started running poorly the instant the lift arms came under load.
Since the hydraulic pump was already pretty leaky, I decided to take it apart and refresh the software, hoping that I might stumble across the cause of my troubles. Almost immediately upon taking the pump off I found my issue. The screw that holds on the coupling between the pump and the ignition unit was twisted off. I thought that was weird since it shouldn't be under much load. Upon closer examination, I saw that the tiny halfmoon key that is suppose to lock the coupling in place was sitting underneath the coupling itself. It appears that someone before me tried to service the pump, but must have knocked the key out while putting the coupler back together and didn't notice.
So what was happening was the hydraulics would come under load when I would use the lift cylinder in the back, which would in turn cause a small amount of slippage between the coupling and the pump output shaft. That would cause the timing to be off. No idea how it continued to run like that.
Regardless, I think I have it fixed. I was able to start it up and have it running smoothly. I'm going to try to use it with the brush hog tomorrow if the weather is nice. I hope someone learned something from my story because I certainly did.
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