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Any insight in getting this spline from a PTO driven sprayer disconnected from this PTO shaft?
I backed out the side Allen screw but it won’t budge. Is that some sort of “key” or lock assembly at the end of the shaft? Or is it just rusted and needs heat + muscle

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Hello TnFeDad, welcome to the forum.

1) Looks like it has a big bolt through the shaft? Or is it to the side of the shaft?
2) Looks like the shaft is slotted for a square key? Not splined.
3) You will probably have to break that washer?

Spray it with penetrating oil for several days and let it soak in.
 

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If it's just froze.... Yoke puller. Take the U-joint out to where just the yoke remains. Take a piece of solid bar stock (round, or square) that fits through the u-joint holes and cut to a length that leaves a 2" margin on each side of the yoke "ears". Drill a hole big enough to put a stout grade 8 bolt through it. Put a big washer/nut on the shaft side of the stock. Hold the nut with a open-ended wrench and torque on the bolt with a hefty air gun. If the gun stops turning the bolt and there is a lot of tension on it, bang on the head of the bolt a couple of times with a BFH until the air gun can torque on the bolt again. Apply heat if necessary. Here's a picture of a commercial yoke puller to give you the concept. Only difference is the bar stock is threaded, but grade 8 nuts/bolts are way cheaper than 3/4" tap. Commercial yoke pullers like the one below run about $100. Might check with your local Autozone and see if they have one in their "loaner tool" program. BigT is probably right about breaking that washer with a chisel, it could be a "retaining clip" that rides in a grove at the end of the shaft


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