I have a 446* that I used last year with a 48 in snow blower and it would scrape down to the cement when snow blowing. I let the snow blower go with the 444 that I sold in the fall. I purchase a 446 with a snowblower on it, but the engine was bad, but the blower was solid except for scraper blade, which we replaced. I use it on the 446 but it doesn't seem scrape as clean. The only thing that was add to the 446* was a flow control for tilling, and a 3point hitch. Is this the reason it isn't scraping the cement clean? Would putting a selector valve on it make a difference? I have adjusted the skid plates and i believe that they are correct. Note you can tell when I lower the blower it's solid on the ground you can see it lift up a little if this makes sense.
Front tire pressure? Higher pressure would probably make the angle of attack a bit more steep. Lower pressure would make that angle a bit lower and maybe get under the ice/snow easier? Since you replaced the blade it may not be worn in yet and that might make a difference.
If there is no selector valve and the mid lift and 3 point tee'd together, then the 2 cylinders would try to equalize and reduce down pressure when you drop the caster. You lower the caster to the ground and start to go. But the 3 point that's tee'd in didn't have weight on it when you lowered the caster so it will creep up and the casters down pressure has now been reduced.
Last year I mounted a length of 1" pvc pipe slit down one side onto the blade of the snow caster on my 448. It rides/slides very nicely without digging in and leaves a smooth, clean surface. Not to mention the blade receives no wear, pvc pipe is cheap.
I don't think you want it to scrape clean in my opinion as it will cause marking issues with the chains marring or digging in on certain surfaces. get the bulk of the snow off was what worked best for me.
Marty
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