Hey
I have a little older than yours royal/pa geier. If you have a brush roll it's different.
The cap on yours pop it off. If your nozzle has a wooden strip with agitation strip on back side of the model it's the same.
The wooden agitation brush is nailed on with 4 flat head nails. Work left to right pry slightly raising a 1/4" and you see first nail. If I remember it may have felt washer. One nail at a time not snapping wood remember this vacuum is maybe 90 plus years old. Once nails are removed comes next step.
The front of the nozzle you twist clock wise 45 degrees. Say from 3 o'clock position to 6 o'clock position. There should be a groove and the nozzle comes right off.
Next on backside there is I believe 4 flat head screws (Phillip head was not yet invented) take those 4 screws out and don't lose anything your not going to find replacement. Once those 4 screws are taken off the fan housing will come apart.
To take fan off I took pics of mine as it's to this point. I have taken fan off but put back on until I work on it again. Behind fan are a couple of air vents. Use a hard plastic Bic pen to Lodge in and hold armature blades from moving. I believe it is counter clock wise is direction you spin fan. If it's not budging get wd 40 spray benind the fan and in vent hole on armature shaft. There is a bearing behind fan between bearing plate and fan. If you spray there it's helpful. Let it sit 10 mins. Put Bic pen in position and the fan will twist off. Now you have bearing plate. I don't know if this is true but it helped me. The screws holding bearing plate clean off with degreaser or with steel wool. Polish the screw tops. It strengthens them.
Take I believe 4 screws off bearing plate. If you pull on armature shaft upwards it should pop up the plate.
Once armature is out with bearing plate you see the motor. I'd take a pic so you know how it goes back together.
If there is a circular piece with 4 screws take screws out. Notice below that plate each screw has a very small spacer do not lose those.
You see field coil take those 2 screws out. Before taking all the way out notice where wires from coil go and what there connected to.
Once field coil is out and you disconnected the wires you will have 2 wires from carbon brush housing one from each housing. You will need needle nose pliers. The carbon brush wires are clipped on to the brush housing with u u shaped end. The fork side of the u(or 3 sides of the 4 are the piece). The side with no piece opposite of that I the fork portion. You pull the fork away from the side with no bracket. You pull it away in straight motion and it will come off. Do this to both but keep track of wires.
There may be 2 screws holding carbon brush housing in. You would remove those. The last 2 wires go to outside of housing. There attached by 2posts either having a nut or nut and acorn nut or both acorn nut and nut. It may have a washer also. Mine had a black plastic cap popped off exposing 2 posts. Take off nut acorn washer etc. The wires are attached with (explaining is hard sorry if words are weird I'm describing best I can)
The wires have a circular wire connection. That should slide off. After taking wires off I put back washer and all hardware on to post so they don't get lost.
Now in the bottom of the motor housing is the bearing oil port all royal/pa giers have. It has 2 screw maybe 3 take those out. This may make o bearing oil port come free. If it doesn't I believe 3 more screws are left take those out and now your motor housing is completely empty.
I'm posting pic of fan housing off and vent where you put pen to stop armature from spinning to twist off fan.
