Is slip clutch needed JD670

Ron, a JD 670 with only 40 hours? WOW! http://www.tractordata.com/farm-tractors/000/1/4/149-john-deere-670.html

Is a clutch needed? NO, but they are better then replacing shear pins all the time. As Matt wrote-they do require a little maintenence but its still better than dealing with shear pins IMHO.

The slip clutches can kind of rust over the winter and should be slipped before using after a long time out of service. This is covered in the manual of the various implements. There might be little bolts to turn to take the pressure off the clutch plates or you might have to loosen all the springs to do that.

Slip clutch

mjncad said:

Ron:

It should already be protected with shear pins. Did the Rankin come with a manual? I like the idea of a slip clutch; but I hear they can also be a maintenance headache as they need to be adjusted properly. Hopefully other members who own slip clutch equipped implements will chime in.

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Mjncad
I bought the Rankin RM used from a local dealer and had not thought to ask for a manual. They did show me the shear pin and in fact provided a spare. I will be finding out this spring about how often they break. I had read some place that without the slip clutch the spinning head could drive the transmission and thus the tractor even with the clutch depressed. Is this a real concern? The JD670 is about 2000#

Thanks for the help

I don't know anything about your tractor and how its geared transmission and PTO operate, so I don't have a good answer to your question.

I used to break shear pins on my cutter because I kept forgetting to lift it up for tight turns. Once I changed a couple of pins on a 90 degree plus day, I got it through my thick head...lift cutter before making sharp turns. I kept catching the cutter blades in the dirt and busting the pins.

Ron JD670 said:

I had read some place that without the slip clutch the spinning head could drive the transmission and thus the tractor even with the clutch depressed. Is this a real concern? The JD670 is about 2000#

Thanks for the help

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The "slip clutch" will not help with that problem, an "overrun clutch" will however, two different things for two different problems. I am 99% sure you 670 has a "live" or "independent" PTO. When you push the clutch in the PTO stays engaged correct?

Read this: http://www.tractordata.com/articles/technical/pto.html

Is slip clutch needed JD670 (or overrun clutch)

Kennyd said:

The "slip clutch" will not help with that problem, an "overrun clutch" will however, two different things for two different problems. I am 99% sure you 670 has a "live" or "independent" PTO. When you push the clutch in the PTO stays engaged correct?

Read this: http://www.tractordata.com/articles/technical/pto.html

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KennyD
Thank you for the reply and link. Based on my short experience and reading the manual multiple time I feel certain I have a one stage clutch and based on the experiience with the PH auger both the PTO and transmission can be engaged/disingaged by the clutch - at the same time. The text in your link is almost exactly what I recall reading, although I do not recall any reference to the overrun clutch. Sounds like I need to make a test run in an open space with that rotary mower - low and slow - and see how the tractor responds. One more thing to think about while trying not to run over things I want to keep growing.

Thanks again.