Check out whatever the manufacturer of your cartridge recommends as the maximum playing weight. Try using a styus balance like the one made by shure which is pretty cheap, but good, to set the tracking force.
The Scout has a unipivot arm as far as I am aware which are notoriously difficult to set up right. Maybe your dealer will help out. Get him to check the bearing and maybe recharge the oil as this can also cause rumble.
You can check this yourself by performing a "spin test". Take off the belt and top platter if it has one and spin the spindle. It should rotate freely without making any noise whatsover for at least several minutes before coming to a halt.
Certainly you shouldn't apply over the manufacturers recommended tracking weight on the cart as this can damage your records badly.
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