Regarding Hydraulics not lifting, I have had this problem right from the time my 3000 was on warranty in the 1960s. The dealer never solved the problem. The symptoms were that it would lift sometimes and sometimes not, it was also jerky. There were periods when it would work normally. Temperature seemed to not affect whether it worked or not. I suspected what I called the floating valve, repair manual refers to it as the unload valve. This valve is only activated by oil pressure on either side of it. So I made up a manual pusher for this valve that can be operated from the drivers seat. So now every time it doesnt lift I push my manual lever that I made up and that makes it lift every time.
You may have to blow a string through the tubing. Then tie it to the very end of the 1/16 cable to pull it around the bend. The cable needs to be extra long to assemble the top cover housing. The ½ inch nipple rotates in 3/4 nipple when operating the lever. Fine tune your cable length with a cable clamp inside the dust cover and coil up excess cable length.
Also be sure to check that the hydraulic pump is bolted tightly to the gear housing it doesnt suck air into the system.