I'm not sure what engine the 648 has... I know on my 646's the Onan was fed via a vacuum powered pump. My first machine came with that pump replaced by a little electric unit. My second came stock. The second was a PITA to start all the time, so I replaced the pump and hoses, etc... Still sucked until I went to an electric pump. Yes, I know you shouldn't need to do that, but I also get tired of fighting with a system that should work, but somehow doesn't...
I probably don't need to tell you, but you're really going to want to drop the hoe, and subframe/counterweight to work on the forward/reverse linkage. Any wear in the banana plate, and ball joint fittings in that linkage will have a significant effect on the travel function. If it's cranky I'd just start right off with a new banana plate.
There are a couple different specific forums out there dedicated to the Case garden tractors, and 64x machines. The wealth of knowledge there is invaluable, and they're also excellent at sourcing parts, which is becoming harder...
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Today's Featured Article - Identifying Tractor Smells - by Curtis Von Fange. We are continuing our series on learning to talk the language of our tractor. Since we can’t actually talk to our tractors, though some of the older sect of farmers might disagree, we use our five physical senses to observe and construe what our iron age friends are trying to tell us. We have already talked about some of the colors the unit might leave as clues to its well-being. Now we are going to use our noses to diagnose particular smells. ELECTRICAL SMELLS
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