What kind of a lever do you have for putting pto in gear. I used to install the type used on later tractors with cabs and that lever was a little bit front end heavy. In other words, if you did not have a good return spring on the lever it would engage really easy. I always put a return spring on the linkage right at the pto to make sure the valve stayed down in off position. I saw a few pto's burn up the clutch packs and the operator never even used the pto because it takes about 20 psi to release the internal spring loaded brakes but only about 10 psi to apply some pressure to the clutch pack so it would be partially engaged even though not turning output shaft. Of course, the usual culprit was dirt under the boot or spacer. If that clutch return spring inside clutch pack is weak from heat it takes very little pressure to put a little drag on those clutches.
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