700 Eating shear pin

My 700 has developed a habit of breaking shear pins this week. Every time I checked and nothing was jammed or stuck. Untill today the pot auger was bound. After turning it forward and backwards it became free. I vacumed the pot and the supply out while turning the auger and really did not find anything that was causing the jam. Any Ideas?

Check the bearings and shafts that form the “gearbox” that rotates the pot on every stroke. If the bearings are out of it the bevel gears will try to jump teeth and can bind, thus possibly shearing the pin. You will need to crawl under the pot and take off the dust cover and you will see how the pot auger and shaft gears are connected together to spin the pot. Observe the rotation and check for a bunch of loose play. If I recall correctly the whole thing comes apart by driving the roll pins out of the gears and shafts with a punch.

Should be able to get the bearings at any industrial bearing outlet if needed.

Thanks will do. it has ran a day and a half so far without shearing a pin. Maybe I vacumed a stone or something out that I did not see. Does anybody have a link to a schematic of the pot.

After another broken shear pin a complete pot cleaning and teardown. The little bolts that hold the grates together were only half there letting the grates ride up and letting fine coal get behind. I am gonna be doin a complete refurb on this when the weather warms up.

There used to be a parts diagram for the S30, S35 and S45 stokers on the Marks Supply website.

Mike

It is still there it does not show the gears than rotate the pot and clean the fines very well. Thanks

After fixing the grates and a cleaning the shear pin issue seems fixed. Now I have a leak in one of the 8 circuits in my shop floor. Holy crap I must be on a roll.