Slip clutch adjustment

[Dargo]

I have a Tisco PTO slip clutch and need to know how to adjust it. I can only find that Woods bought Tisco back in 1999, but cannot find anywhere how to adjust my slip clutch. Anyone have any ideas? /forums/images/graemlins/confused.gif

 

[greg_g]

A picture would help. If not possible, is it the type that uses friction discs tensioned with bolts/springs/nuts? If so THIS may help

//greg//

 

[Dargo]

Yes, it is a friction disk with bolts and springs. I just want to try to set this to slip at about 40 hp. Apparently it isn't going to be an easy task. /forums/images/graemlins/frown.gif

 

[greg_g]

</font><font color="blue" class="small">( I just want to try to set this to slip at about 40 hp.)</font>
Yes. If it hasn't been used in a while, disassembly/cleaning/reassembly could be a time consuming project. But a simple adjustment shouldn't be problematic. The spec sheet for mine says adjust spring length to 27.0mm for 40 (PTO) horsepower. At that setting, it's supposed to take 4680 ft/lbs of torque to slip otherwise functioning clutch plates.

//greg//

 

[Dargo]

Thanks Greg_g! I got my calipers out and measured the spring length on each of the 8 springs, and each was set at precisely 27mm. I was amazed, and pleased that the unit was apparently set at 40hp from the factory. The slip clutch was made in Holland and has the name "Tisco" and some other name that starts out "Weasle..." (I can't read the rest of that name). I noticed that when I looked up Land Pride rotary cutters, this apparently is the slip clutch they use.

I have a 40hp gear box but about 50 hp PTO output. I've beefed up the decking and frame on the rotary cutter with 2X2 3/8 wall square tubing and 2X3 1/4 angle. I added almost 600 pounds of reinforcement to the cutter. It it a 6' cutter and now it weighs almost 1300 pounds. My theory now is that I'd like to protect the 40hp gear box, but if it goes, I'll replace it with a 65hp box and be set with a heavy duty cutter. Thanks again for your expert input! /forums/images/graemlins/cool.gif

 

[greg_g]

</font><font color="blue" class="small">( T My theory now is that I'd like to protect the 40hp gear box, )</font>
In that case, you might want to consider backing the springs off slightly, so that something just under 40hp (equivalent) will slip the plates. My chart says the 35 hp setting is 27.5mm, which indicates slippage at 4085 ft/lbs of torque.

//greg//

 

[Dargo]

Good idea. Easily enough to do as well. Thanks! /forums/images/graemlins/cool.gif

 

[Egon]

Do a search for slip clutch adjustment. There are some older threads out there on this.

There is a lot more to it than just measuring the spring compression.

Egon