[mark]

i have a 84 318 sometimes when mowing at slow travel speed hydrostat chatters fluid is full and new along with filter. i dont notice it whith snowblower this time of year

 

[rustyknuckles]

Mine has always done that. I just ignore it.

 

[mikeduwe]

Could be due to slop in the linkages.

 

[knottyrope]

my 430 does it a bit but it is from worn linkage pivots