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jdemaris
09-11-2003 18:37:15
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Re: JD450 with Backhoe in reply to back40, 09-11-2003 04:34:20
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As far as being rugged goes, the JD 450 is twice the machine a Case 310 is. The Case is not much more than a Cletrac HG with a 188 cube engine stuck in it. The transaxle is the basically the same Clark unit used in the Cletrac. As far as horsepower goes, depends on what vintage the 450 is and whether or not it's a turbo. A JD 450B with turbo would run circles around a Case 310. Generally speaking, no special tools are needed for working on the 450 except for the HL-R transmission. It's probably one of the most rugged hydraulic transmissions JD ever made, but can be a real pain-in-the-ass if it needs rebuilding . . . and expensive. Working on the undercarriage, e.g. the rollers, idlers, sprockets, etc. is no more difficult than any other crawler. You asked about weak spots. Only one that comes to mind, maybe, is ... or . . . are the balancing shafts in the engine. Since four cylinder engines tend to vibrate a bit, John Deere uses two balancing shafts in the bottom of the engine. What happens, over time, is the engines get a few "in frame" rebuilds, which means perhaps new sleeves, pistons, main and rod bearings, and perhaps oil pump gears . . . but the balancing shaft bearings don't get changed since they're not so easy to get at. So, you then wind up with an engine that won't hold oil pressure when hot. I don't think it's fair to call this a "weak" spot, better put it's a neglected spot.
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