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Discussion Starter #1
I have a Toro WH 312 8 garden tractor. Recently I started losing power to my mower deck. When I get into grass (not any higher than I've normally cut with no problem) the PTO starts slowing down to a crawl which obviously slows down the belts and then the cutter blade rotation. The engine is not struggling. The wheel speed of the tractor is not slowed. I can back up to a cut area and it slowly gains mower blade speed but then quickly loses it again. The only thing I have changed recently is to put a new battery in after the old one died. Suggestions?
 

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There’s an adjustment on the linkage down by the PTO. Disconnect the linkage from the throw, and give the little doohickey at the end of the linkage a turn or two, then hook it back up. No need to remove the belt to do this. You’ll notice the PTO lever will be a little more difficult to engage. It forces the PTO against the engine mounted clutch tighter. The clutch does wear eventually, but an adjustment is a free starting point. Hopefully your machine has been a bit sheltered, or that little adjuster might need to sit a few days with penetrating oil applied.
 

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Discussion Starter #4
Thanks! I will give the 'trunnion' (as named on the parts list) a few spins and see how that works. I was also wondering how you know if you ever need to replace the clutch plate...

I have replaced the belts a few years back but they may need to be replaced as well.

Thanks for the suggestions. I'll see what works.
 

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Also you might grease your spindles, if you haven't done recently.

Another thing that I find on mine , in the are I live in , is nylon shreds,, fishing line, threads of rope, even bailing wire, etc all seem to find the bottom of my spindles. These all seem too put a bit more strain - rpms - on mine
 
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