Maybe you just get alot of dust and notice then. Even though ive never been to plow day or worked my cub hard for 3 hrs, those valves and orings should withstand a full days work. Jmech might have an idea with warm oil, but only on a fifty year old seal, maybe only if its never been replaced.
I agree very expensive, but if you want a new one; heres one on ebay:
https://rover.ebay.com/rover/0/0/0?m...2F282680102073
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Steven
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127 NF, spring assist, 36" IH Danco BB-36 snowthrower, 42" mower deck. CW-36 snowthrower, 42" NF blade. QA42A blower, 126,127,149,1720.
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