Adding a Slip Clutch

/ Adding a Slip Clutch #1  

MikePA

Super Moderator
Joined
Apr 25, 2001
Messages
12,341
Location
PA
Tractor
Had TC25D, now JD X310
Is it possible or pratical to add a slip clutch to a post hole digger?

If it is, how do you set the clutch to slip at the right time?
 
/ Adding a Slip Clutch #2  
Mike,

The clearance of the unit would be the only issue that I can think of that would give you a problem with installing a slip clutch.

The clutch has spring tension on the assembly that is controlled by how tight the springs are compressed by the adjusting nuts. There is one nut for each spring and there will be 4 or more of these assemblies around the edge of the unit.

Hope this helps,

Don
 
/ Adding a Slip Clutch #3  
Mike,
I was just in our local TSC yesterday and saw a pto slip clutch. It is designed to go right on the pto of the tractor, and then the pto shaft to the phd would go on it. As was posted by another, the torque at which the clutch slips is adjusted by tightening nuts that compress springs to engage the clutch. As I think about this, it sounds like a great solution - not too expensive, and will save you the time of changing those shear bolts.

It was kind of large in diameter, so you may have to remove any pto shield. Also, it does position the pto further back, and may require you to shorten the pto shaft on the phd.

Greg
 
/ Adding a Slip Clutch #4  
Greg;

I was thinking about adding a slip clutch to my Bush Hog. What was TSC asking price for clutches?

Sim
 
/ Adding a Slip Clutch #5  
Slip clutches are designed to go between the pto shaft and the gear box of the implement not between the tractor and the pto shaft.
 
/ Adding a Slip Clutch #6  
SimS,
I really don't remember. All I know is that it didn't seem too expensive. I have their catalog, but they don't list it.

Greg
 
/ Adding a Slip Clutch #7  
JerryG,
I don't see that it makes much difference which end of the pto shaft the slip clutch goes. If you put it on the tractor's pto, then you can use it on multiple implements like phd, bh...that don't have one.

Greg
 
/ Adding a Slip Clutch #8  
Most tractors don't have enough room on the tractor end . Plus different implements require different settings on the clutch.
 
/ Adding a Slip Clutch #9  
Was at the farm days Tues and looked at the slip clutches. $165 and they are supposed to go on the implement end of the pto shaft, not the tractor side (even though it looks like it would fit). Think the problem is you want the slippage as close as possible to the point at which the thing is "binding" up so you don't transmit all that torque down the shaft (which is what happens if there is no "slip" until the tractor side of the shaft.) I asked for the exact reason just mentioned. Seemed pretty cheap if you could just buy one and put it on tractor pto output shaft but no such luck........
 
/ Adding a Slip Clutch #10  
TSC did have them for just under a $100. That was about a year or so ago. Don't know about now.
 
/ Adding a Slip Clutch #11  
Probably a wide variety of them depending on the implement they're designed to go on. The one for $165 was pretty heavy duty looking, the diameter was about 8 inches and it had at least 9 bolts torquing it down. Probably heavier than you would use for a post hole digger. (He also said they make different styles for different uses).
 
/ Adding a Slip Clutch #12  
Sim,

TSC's price for the slip clutch for a rotary cutter is $92.69. That is on page 226 of the 2002 blue book.

Don
 
/ Adding a Slip Clutch #13  
Be careful if adding a slip clutch on the tractor side with
a pto shield. On my slip clutch purchased at TSC, it has two bolts that must be fastened to the pto spline unlike the standard pto shaft with a spring loaded pin. What happens is, as
your clutch slips under load those bolts change location in relationship to the bolts that hold the clutch together and
you may not be able to remove them. This happened to me and I did not notice the problem until I had removed my tiller. Then it was either reattach the tiller and put it under load and hope the bolts cleared or dissasemble the cluch. In my situation i elected to disassemble the clutch. To me this is a very poor design, it doesnt matter if the clutch is on the tractor side or the implements side, you may still have a problem getting the bolts out. Has anybody else experience the same problem? I called TSC with the issue and they mailed me a new pto shaft with a shear pin. I have not used it yet and I'm not sure how its going to work. I hate the thought of having to change pins in the field all the time.
 
/ Adding a Slip Clutch #14  
I added a slip clutch to my auger after I got sick of breaking shear pins. It is part of the PTO shaft and replaces the coupler at the tractor PTO end. It works fine and there aren't any clearance or other problems. I ordered it through my dealer where I got the auger. No more broken shear pins ever since. However, I have since replaced this with a hydraulic auger on my backhoe. The addition of down pressure makes a huge difference in rocky soil.

Dave
 
/ Adding a Slip Clutch #15  
qzbmpc,

I think that the slip clutch should be at the impliment end and adjusted for that unit.

I know that having one on each impliment would get expensive, but that is where judgement comes into play. Which one breaks the most shear pins, is used the most and is the biggest pain in the gluteus maximus to repair. :)

Don
 
 

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