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 - A Lifetime of David Brown Tractors - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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