Without removing the clutch disc and pressure plate, it is not possible to install a pilot bearing. Its outside diameter is larger than the splined opening in the clutch disc. Check this out by going to your parts store and asking for both a pilot bearing and a clutch disc. See if the bearing will pass through the center splined hole in the clutch disc.
It is very unlikely that your 1st pilot bearing was missing. You'd tear up the clutch disc in short order.
Do your diagnostics. Disconnect the driveshaft from the back of the transmission with the rear wheels lifted slightly above ground. Can you easily turn the driveshaft by hand and see the rear wheels turn? If not, you probably have a U-joint problem. Now grab the output shaft of the tranny and see if it turns easily by hand. Put the tranny in N for this. If the truck is 2 WD, the shaft should turn somewhat easily (but cold tranny oil makes it stiffer). If it does not turn by hand, then the trouble is either in the tranny or clutch.
It is possible that your "mechanics" got the bell housing misaligned with the engine. There are usually 2 alignment pins that help them get it right. If there is any visual crack between the engine and bell housing, even thin enough that you can pass a playing card through, then the tranny and engine are misaligned with each other. That would put a serious strain on the clutch disc, pilot bearing, tranny input shaft and its bearings. Depending on how bad the misalignment is, you may have already destroyed the tranny. If the opening is about the thickness of a playing card, very little damage is likely, but if the bell housing got cocked on one of the alignment pins and there is more than a 1/4" gap on one side, you may have already destroyed the tranny.
I hope the problem is just a U-joint. Usually a cheap fix.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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