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Thanks Bart! (...you make me blush!) I have no experience with the M&W live pump. But we've got a couple SM's and an SH with IHC live pumps. They all have a distinctive sound when you stand on the pump side of the engine - kind of a gear whine. It's most noticable if the engine is otherwise quiet (at idle, quiet valves, good muffler, etc). Also is particularly apparent when first started in very cold weather. Make sure however the reservoir is full, the reservoir suction strainer or filter (if equipped) is clean, and the suction line between the reservoir and pump inlet is not kinked/collapsed. Any of these will cause pump cavitation and whining noises. Otherwise if the hydraulics lift your snowblade OK, and you're not getting any slapping or knocking noises from the pump, I'd be inclined just to use it. Good luck! If it's snowing in VT like it is here (upstate NY) right now, you'll have snow to plow this afternoon!
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