Check for fluid yes, but IMO it's probably whining a bit more noticeably because of the added weight you put on it. Hydros will do that.
OR it's just complaining in general because it doesn't like that it's going to be cold out and you can't mow with it anymore.
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Daniel G.
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(May 1970) 147 w/an IH spring assist, 48" deck, 42" blade, 1969 73, #2 trailer, 10" Brinly plow and (on loan) Dad's #2 tiller.