If you have some Silicon Oil 300,000 or 500,000 it's not difficult to clean and replace the "fluid". It's really not fluid, but very thick silicon oil.
Just redid my 770h, so the instructions are fresh.
Remove platter(unless the clip is in place)
remove headshell(after locking tonearm
remove counterweight
take table out of base, and locate cueing mechanism. Notice the cueing arm moves a bent wire which is inserted into a hole in the cueing shaft, and also attached with a washer and post clip on the other end.
for tools you need a small pointed tool to remove the clip, don't lose it.....put clip and washer to the side. Note the spring is above the wire, not below!
a 7mm wrench to remove the nut on the bottom of the cueing shaft. Hold the cueing wing which is directly under the tonearm, until you can remove the nut easily. Both should unthread easily due to the oil/grease on the shaft. Pay attention to how far the second nut is threaded onto the shaft before you remove it. After removing the first nut, you can remove a black steel plate which also has a spring. Clean it and put to the side, no reason to remove the small spring, just make sure it is clean and can move.
remove second nut, then unlock tonearm amd move toward center of turntable, and then you can spin the cueing shaft from the top to miss the tonearm and lift it out.
Clean the shaft with lighter fluid or some other grease cutting cleaner, even deoxit will work. If you have a pipe cleaner you can try to clean the tube that the cueing shaft is inserted into, but I did not find that necssary.
Add some new silicon oil noted above around the two grooves on the shaft, and insert it back into the tube. Check that it moves up and down by finger pressure, and if so, reinstall the other parts in reverse. Note also the black plate has a notch that fits around a small shaft kind of hard to see hidden behind another piece of the tonearm mechanism. Remember the spring goes above the wire that is inserted into the cueing shaft.
BEFORE you reinstall the table back in the base, put the table face up on the work surface, install the counterweight, install the headshell(you can remove the stylus if worried about damage. do a quik balance and add tracking force, then check the cueing action. At this point table is still unplugged for this check. IF you left the platter on AND if you're still unplugged, doesn't hurt to have any record place on the mat just so you don't screw up the stylus.
Happy Listening!!
jim
Sounds complicated, but really it's just a careful disassembly, and reassembly