Thanks J-Mech, I thought it should be pretty tight otherwise I think it'd knock seals out or something worse. I removed the coupler from the pump & the roll pin was worn almost thru on one side, the holes in the coupler for the roll pin are badly worn, the bolt holes to connect the coupler to the drive shaft are worn some & the hole in the center of the coupler that the driveshaft fits in is very badly worn. Looks like its been ran a while on badly worn parts. Looks like a new coupler will be purchased, any suggestions on where to get one??
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