Grandpa, I am going to give you my opinion. I dealt with 450 451 mower a lot and we had lots of issues. That head and rocker arm system is costly and can take lots of work. All parts were costly new and hard to find used. For us I got away from them and so did some other farms. Get some manuals there not to hard to work on and I hope you get better mileage than we did.
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Today's Featured Article - Oliver 550 Purchaser Checklist - by Greg Sheppard. Pound for pound the 550 is better than anything I've seen. It has great power for its size and can really hunker down and lug. Classified as a 3-bottom plow depending on soil conditions. I personally don't think it can be beat for a utility tractor in the 40 HP range. They are extremely thrifty on fuel, at least my DSL is. Most drive train parts are fairly easy to get. Sheet metal is probably the hardest thing to
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