Adjusting PTO clutch

   / Adjusting PTO clutch #1  

ning

Elite Member
Joined
Mar 30, 2017
Messages
3,416
Location
Northern California
Tractor
Branson 3520h
I recently started to use a rotary tiller on my tractor (related thread: https://www.tractorbynet.com/forums/attachments/411437-question-about-rotary-tiller-what.html.
On the PTO shaft is a hefty friction clutch, and I have questions about making sure it's properly adjusted.

I followed some instructions I found elsewhere (my tiller has no identifying marks or plates that I've found, nor documentation, but the price was right) - loosened all nuts 2 full revolutions, used a marker across the plates, engaged PTO at idle, disengaged, verified that the plates had moved, and then tightened the nuts 2 full revolutions.

As far as I can tell the clutch works fine - not only did the initial test work, but when engaging in the ground occasionally it obviously spins. Possibly more easily than it otherwise could - when my tiller stops, my tractor engine barely notices, so I suspect that the clutch may be adjusted more loosely than it has to be - though to be honest, I'm fine with it disengaging how it is, it just raised in my mind that where the clutch was set when I got the tiller (not exactly new, but definitely unused) wasn't necessarily correct.

How do you dial in a clutch?


Also - is it reasonable to trim the PTO shaft cover? Unless there's barely a bend , the cover hits the clutch bolts and makes a racket and as you can see it's probably going to crack the shell at some point.

IMG_20190424_133443.jpg
 
   / Adjusting PTO clutch #2  
I do pretty much the same with my tiller but drop it down to engage the tines and make sure the clutch slips(while loose) for a bit then re-tighten.I do mine every spring;also do my 6' bush-hog ,a little more difficult but about the same procedure.
 
   / Adjusting PTO clutch #3  
IM pretty sure that cover should extend over the slip clutch all the way, it looks like it might be to short.
 
   / Adjusting PTO clutch #5  
Those clutches can rust solid so regular maintnance is critical. After completely loosening the springs my tiller can still cut a 2x4 in half powered by nothing but rust holding the clutch together. I jammed the 2x4 in specifically to knock the clutch free.

I dont remember how many turns you crank the bolts down offhand on mine & it can vary. But once you bust the clutch free, tighten them down equally a turn or 2 & test. The clutch will get really hot really quick if its slipping. You can also paint or otherwise mark the clutch disk & plates to see if its slipping. Gradually tighten it up until it barely doesnt slip in untilled ground. You want it to slip if it hits something hard, but not otherwise.

I'm sure your clutch isnt slipping as it spins down.
 
   / Adjusting PTO clutch
  • Thread Starter
#6  
Those clutches can rust solid so regular maintnance is critical. After completely loosening the springs my tiller can still cut a 2x4 in half powered by nothing but rust holding the clutch together. I jammed the 2x4 in specifically to knock the clutch free.

I dont remember how many turns you crank the bolts down offhand on mine & it can vary. But once you bust the clutch free, tighten them down equally a turn or 2 & test. The clutch will get really hot really quick if its slipping. You can also paint or otherwise mark the clutch disk & plates to see if its slipping. Gradually tighten it up until it barely doesnt slip in untilled ground. You want it to slip if it hits something hard, but not otherwise.

I'm sure your clutch isnt slipping as it spins down.

Right now the ground is about perfect for tilling - it was recently a muddy mess but right now has just a hint of moisture in it still. The tiller eats it up well, and it obviously slips if I dive too deeply too quickly, or if it hits a big rock - no worries there. I may have to tighten it up if I use it once the ground gets sun baked...

I've had a couple of the bolts for the tines work themselves loose, and proceeded to tighten all 108 of them. An hour later, I hear clanging and I'd lost another bolt and a tine was hanging by a barely-nutted bolt. Should I lock-tite these? They have split lock washers, but I'm not too impressed by their holding power. The bolts are 8.8 M12x1.25x35, which isn't exactly a common size bolt... I ordered up a dozen from the local Fastenal because this is looking like a regular event!
 
   / Adjusting PTO clutch #8  
Locktite
 
 

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