Under the spindle assembly. What are the square headed bolt and the grub screw with locking nut for ?
These are for adjusting the limit of movement. The nut locks the threaded part at the right length. Probably factory adjusted. Leave it unless the blade won't go fully down below the table.
Also, the 2 large headed pins that hold on the riving knife bracket. How does one remove them ?
They are bolts; flat circles are their heads. Move the elevation assembly down with the wheel to its lowest position and you should see the nylock nuts that hold the bolt heads. Undo. Riving knife bracket comes free.
The spindle bearings don't appear to have any movement in them and are completely quiet. Is it really worth me replacing them ? It doesn't seem to be a difficult job if they need to later.
Mine were a total and utter bear, because the pulley at the motor end of the spindle had fused itself to the Woodruff Key and the shaft. Replacing the bearings is a methodical, straightforward job after that. Modern bearing stockists have readily available ones. Note carefully the designation on the old ones, or better still, take them along with you to your stockist.
I've removed both trunnion trapping plates and the rise/fall handle and the whole assembly is now loose. But how do I get it out of the main saw tub ? Do I have to also remove the rise & fall shaft bearing housing as well or should I be able to maneuver the whole lot out as is ?
Yup. As said above, rise & fall shaft bearing housing has to be withdrawn from operator's position at tthe front of the saw. Not only does it have two allen-headed (B.S. hex) set screws hiding on the casting, you have to rotate the housing 90 degrees as you withdraw it through the curved slot on the cast iron cabinet. Take the opportunity to fully dismantle it and clean/regrease the beast while it's out.
The major internal casting can be made easier to lift if you unbolt the blade arbour and riving knife plate.
N.B. The rise and fall casting pivots on a MASSIVE pin held into the larger casting by two allen-headed set screws (B.S. again). BEWARE you don't damage this separating the two castings for cleaning or painting.
No, you shouldn't have to remove the shaft attached to the adjustment wheel. Just be VERY careful re the worm engagement, especially on reassembly, when you are dropping the main casting (tilt portion) back in. It is heavier than you think. The shaft CAN be got out fairly easily, just taper pins in the bushes etc. Make sure you identify the WIDER end, then tap with a hardened punch (cut off masonry nail) on the SMALLER end! Also, look out for the copper or bronze 'washers' used and replace them in the right sequence/place.
It pays to clean everything thoroughly, then PTFE-based lube spray does a lot. Especdialy on sliding faces of trunions.
I've got photos - not good ones - from eons ago when I did mine. Suggest you do too. It helps bucket loads when you're re-assembling. The original Wadkin AGS 10" manual is also superb if you stare at the parts diagram long enough; you eventually learn to think in three dimensions, and everything becomes clear, even if it is a dirty, ache-inducing limbo dance to fettle the bits back into place. If you've done your homework, things are faster. DAMHIKT...
Good Luck and enjoy.
Sam