Just to check the nut I put a line of white out across part of the same to see if their would be misalignment after use. The good news the PTO ran at full speed and did not slow down in heavy grass/mowing conditions. Just mowed 10 minutes. When I went to check the white line it did not help as they were all rubbed off from the friction of the grass etc. Will keep watching, thinking the slip clutch was too loose to function properly.
slipping slip clutch
- Thread starter yanmars
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ruffdog
Super Star Member
- Joined
- Dec 31, 2011
- Messages
- 10,670
- Location
- southern wisconsin
- Tractor
- Bobcat Toolcat 5610G, Deere X744, Cub Cadet IH 982
Is the clutch on the tractor end of the pto shaft?
ruffdog
Super Star Member
- Joined
- Dec 31, 2011
- Messages
- 10,670
- Location
- southern wisconsin
- Tractor
- Bobcat Toolcat 5610G, Deere X744, Cub Cadet IH 982
Well, that's interesting......
OzKioti
Silver Member
I have an 8" clutch with two wearable discs on my 6' slasher (rotary cutter). Slasher has a 90hp gearbox, and it's driven by the 76hp Kioti, so maybe, I dunno, 68 or thereabouts PTO hp.
I've been running with the same clutch plates for 16 years behind a 47hp tractor.
Recently, I re-sowed some pasture after roto-tilling, and man, did that new grass get up and going! Very tall and very thick. When I went to slash it, the clutch started slipping, and it released it's smoke. Clutch plates were pretty well toast, so I fitted a new pair.
Recommendation was to tighten the eight bolts all the way to fully compress the springs, then back off three turns. The bolts are 12.5mm bolts, with 1.25mm thread pitch, so that's a backoff of 3.75mm, a bit over 9/64" (Metric is SOOO much easier!!!)
Well, the thick grass again caused slippage, so back in the shed I tightened up another half turn. On the way back to the long patch, the slasher bottomed out on a high patch of ground, but was good on the shorter grass, however it started slipping and smoking again on the thick patch.
Back to the shed to find one of the two plates had shattered.
I'm thinking that by going down to two and a half turns, I tightened the eight springs too much, and the shock from bottoming the cutting disc/blades may have caused the plate to shatter.
I've just picked up a new pair of plates, and I'm thinking I may have been driving into the thick grass too fast, so maybe attack it slower and give the slasher a chance to "digest" the long grass? I'm pretty sure the previous 47hp tractor would not have been up to the task at all, so I think I over-drove the clutch. The hp rating for a twin plate 8" clutch is 60hp I believe.
Thoughts guys?
I've been running with the same clutch plates for 16 years behind a 47hp tractor.
Recently, I re-sowed some pasture after roto-tilling, and man, did that new grass get up and going! Very tall and very thick. When I went to slash it, the clutch started slipping, and it released it's smoke. Clutch plates were pretty well toast, so I fitted a new pair.
Recommendation was to tighten the eight bolts all the way to fully compress the springs, then back off three turns. The bolts are 12.5mm bolts, with 1.25mm thread pitch, so that's a backoff of 3.75mm, a bit over 9/64" (Metric is SOOO much easier!!!)
Well, the thick grass again caused slippage, so back in the shed I tightened up another half turn. On the way back to the long patch, the slasher bottomed out on a high patch of ground, but was good on the shorter grass, however it started slipping and smoking again on the thick patch.
Back to the shed to find one of the two plates had shattered.
I'm thinking that by going down to two and a half turns, I tightened the eight springs too much, and the shock from bottoming the cutting disc/blades may have caused the plate to shatter.
I've just picked up a new pair of plates, and I'm thinking I may have been driving into the thick grass too fast, so maybe attack it slower and give the slasher a chance to "digest" the long grass? I'm pretty sure the previous 47hp tractor would not have been up to the task at all, so I think I over-drove the clutch. The hp rating for a twin plate 8" clutch is 60hp I believe.
Thoughts guys?
OzKioti
Silver Member
UPDATE - New clutch plates installed, and the eight springs were backed off three turns from fully compressed. I put the tractor in a lower gear, and attacked the grass at about 3 km/hr instead of 8 km/hr, and all good! (That's 1.9 & 5 mph approx)
