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Case Tractors Discussion Board

Re: 70series PTOs not stoping.----- Warning!!!

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Posted by Adirondack case guy on October 05, 2012 at 20:54:22 from (

In Reply to: Re: 70series PTOs not stoping.----- Warning!!! posted by Kow Farmer on October 05, 2012 at 19:12:27:

Most cable failures were on open station tractors at the trunion on the engagement lever. The trunion rusted fast and would not swivel, causing the cable core to break off. There were also ocasional issues with the large cable locating nuts loosening and allowing the cable housing to slip loose from the brackets, causing improper spool movement.
You have a late model 1070 with a bonded brake pad and a stronger brake engagement spring. Low pto clutch pressure or an opperator who engaged the pto frequently to (say unplug a chopper} would warp the clutch discs so they drag, and cause the pto to overide the brake. Also the outside if the tapered clutch drum on which the Brake shoe rides is machined about .004 off center allowing the brake shaft to ride further out, on the shy side and engage the drumb more vigorusly when it revolves to the bold side If at sometime, the clutch plates were able to overide the brake, the shaft/pad would not retract, but the drumb would flex the 5/16" brake shaft and eventually the shaft would break and then the cast brake shoe was in the bottom of the tranny. As Rich said, if the pto coasts without load and can be stopped with a very light load, as with the "iron fist" as I sugested, (You should also be able to feel the efect of the offset with the break holding in one spot a bit more, if just worn), you are probably OK, BUT heed my warning.


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