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Does it engage by an electrical switch or by a handle that you pull or push. If it is by a handle then make sure when they changed the clutch that they got all the linkages reconnected - if that is all there then there should be a sight cover to the pto clutch and make sure that the throwout bearing is in the proper location. If it engages by an electrical switch, make sure all the fuses are good and there is no connections left loose nor a harness or wire showing signs of being pinched or cut. An electrical switch activated PTO will have some kind of a motor somewhere that moves the clutch make sure that it is connected and it is also bolted up right and have somebody flip the switch and see if it's actually working - if motor hums momentarily or continously (parts missing).
possible that the teeth of the pto dog are worn to a taper and not fully engaged
the lever for the engagement is moving the full travel to engage
the bearings on the pto shaft are failing and allowing misalignment of the shaft thereby walking the dog out of engagement
When engaging the pto it is important that you have the clutch disengaged so that the pto gear is not spinning in the box.before it engages.
The pto gear runs off the counter shaft of the gear box and is spinning all the time the engine is running
when engaging the pto ,you are physically engaging a gear ( like selecting 1st gear) so you have to stop the counter shaft spinning so that the pto gear will engage with slashing
Does this only happen when the engine is warm or at operating temperature or all the time even when cold? In older engines, a 'bad ignition coil' would fail when the engine warmed up and would not start again until cool or at ambient temperature.
Cub Cadets have one of two types of PTOs. The most common is gear driven. The gear teeth of the PTO shaft are very small and thin. If the PTO is engaged without proper clutch action, the gear teeth grind together, trying to engage. A little wear on these gears will cause the surface of the gears to become beveled, and when the PTO comes under load, the beveled surfaces of the gear teeth force the gear lock to disengage. The only option is to replace the worn gears...
The second type of PTO drive is electric clutch. This is a disc type clutch that is engaged by energizing an electromagnet built into the clutch pack... any disruption of electrical power to the clutch pack while under load will cause the clutch to disengage and then possibly try to engage while under load and casues the clutch pack to slip and will overheat almost instantly...