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46" deck. 2004, I think. This is my 3rd Murray wide body 46" mower since buying my 1st one in '98. I really like them.
I know the decks well, I've replaced numerous spindles, blades, pulleys, belts ..... but I've never dealt with this before. How do I tighten up this slop at the arm pivot bolt?
(See video).

This deck has been in my ownership for about 4 or 5 years. I use and abuse it greatly ... mowing twigs, sticks, small branches and even rocks on occasion.
I have some incidental spindle bearing slop, but this tensioner pivot is a HUGE problem as it causes the pulleys to rub together and occasionally throws a belt at certain angles.
I'm going to remove the deck this weekend and do some annual preventative maintenance and would like to address this pivot point.
I can see shimming the shouldered bolt with washers, but it will lose the auto tensioning function if I do that.
Maybe a sleeve over the shoulder to take up the slop in the deck hole????
Any guidance?

The pivot hole for the arm is flogged outoval because you have not been lubricating it properly
It is still available in OZ so should be available in the USA
Not cheap
Along with that will be the bush it runs on and if it is really bad then the bolt as well
IT can be welded & made round again which I do because it is cheaper to do that than replace the tension arm

OK. Thanks, Bert. Never knew there was a bushing in there, nor a lube zerk.
I'll tear it down in a few days and see what I can do to fix it.
Thanks for the info.

There is probably no way to grease this part, I just shoot some penetrant on mine every so often , the bushing or bearing is worn out , the bolt on the arm itself may be worn as well,

I see no bushing on the idler arm just a shoulder screw. Replace both items 35 and 14. Also check item 13 for the same worn out condition. The problem is item 13 is NLA.

Interesting
The one I just did had a plain bolt not shouldered and a flanged bush
So either we got a different deck down here or some clever bugger fixed his by machining the flogged out hole bigger & making up a bush .
I turned up a slightly taller bush to replace the grooved one and welded a washer on the tension arm to make the hole round again.
These get a generous spray with either dry pushbike chain lube or dry lithium chassis grease

Update:
The tensioner arm was indeed wallowed out. The shoulder bolt is still usable.
Maybe I can get someone to weld up a washer in there or weld it up & re-drill it to fit.
Thanks for your comments and knowledge.