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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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