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Jeez, what is it about PTO shafts that seems to bring out the animal in us? We got one guy wanting to know if he could yank out a reluctant shaft with his 4WD pickup, and now you're talking about using "friendly help" to get a reluctant one back in. Do Not Wallop On The PTO Shaft. You Will Regret It. A rubber mallet, maybe. But no more. For why? Because, as Zane says, it drives the pump, through two splined steel eccentric collars. Your example of the spider gear dropping off the halfshaft is very suitable. When you pulled the shaft, these collars were a little reluctant to slide over the splines on the shaft. If that was all, you'd be fine. But the collars drive sliders made of brass, and all is mounted in a pump made of cast aluminum. You go to walloping on this with the old 14# persuader, and it will cost you about $500 for the first good whack and more for each blow thereafter. As Zane suggests, drain the fluid and remove the inspection covers, and "see" the shaft back through the various places it has to mesh. The pump eccentrics may be worn or damaged, as may be the PTO coupler, but if the old one came out you should be able to get the new one in. But resist the urge to reach for the KEDS (Kinetic Energy Delivery System). It will do no good and may do great harm. llater, llamas
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