Had about an hour to fool with this today, started by opening the box on the side (above speed control knob), it has a brass tag on the cover, cleaned it up, its just an "Equipped with Timkin Tapered Roller Bearings" tag. The box appears to be for electrical controls, it has multiple knock outs with plugs in them, but there is nothing in there. Next I pulled the blower off, I'm guessing the belt has been changed in the last 20 years because its stamped "Made in Korea", but it is hard and cracked so it needs to go. With the auger engaged I can spin input shaft and auger does not turn, and the square input shaft to manually turn auger(next to In/Out knob) only turns in one direction and has a ratcheting action. The auger output shaft appears to have 2 seals, the outer seal is on a removable plate, it looks like a rod seal on a hydraulic ram. The inner seal appears to be a more common type shaft seal with a metal ring and inner rubber seal. The other end of auger shaft, the end where you would manually drive auger, has a large washer covering the seal, the washer will rotate freely, but I'm not sure yet if I need to pull entire shaft, or if a bur has been raised on the shaft by whatever handle was used to turn it, since I did not get the handle.
I posted pics and a description of this stoker on another site (smokstak.com) and got this response"I have no manuals but we had one when I was a kid. The in/out clutch is used to let you manunaly rock the auger to break up clinkers or big lumps that might jam the auger. Inside there is a wierd timer that runs the stoker intermittantly to keep the fire from going out. There is a square bucket on a rocker arm. It is filled with hydraulic fluid via a choice of several orfiaces when the unit is running and drains out thru an adjustable needle valve in the bottom of the bucket. As the bucket tips back and forth slowly it triggers a mercury switch to cycle the thing on and off. The adjustments let you adjust off and on run times to suit the type of coal used and natural draft of the furnace. If the thermostat calls for heat then it runs constantly until the house warms up. You will see all the controls when you open the end if the unit.
I picked up a bunch of purple degreaser today, this thing needs a serious bath before I pull the top cover or any shaft seals, I'm used to grease, even black moly grease, but grease and coal dust is whole new level of nasty