S20 stoker arm

my efm 520 has the older type S20 pot assemble the min feed is 4 and max is 8 i believe these assemble's came from the high boy boilers correct me if im wrong. the problem is i cant adj feed any lower then 4, i thinking about machining a new rod. the reason for this is because of summer months. the rod would be smaller so i can adj to lower the feed. look forward to hear from uses guys.

Ryan, take a close look at the crank pin (bolt through the slot in the arm) compared to the shaft from the gearbox...I don't think you can do any better than the way it is.

You could upgrade to the newer style feed-control collar if you want to run less than 4 teeth, but in my opinion I don't think it is worth it. I have run 3 teeth during the summer, and I ended up running a longer timer cycle to keep the fire alive. It takes a certain amount of coal to maintain a fire, and once you get to that number reducing the feed rate just makes the stoker run longer.

rob as of now i heat 1400 sq feet and when im in the garage occashionly i will heat that, garage is 900 sq and 40 feet from house, using under ground pex 270 feet total, and airhandler with heat exchanger in it. stoker runs at 4 feed and 5.5 air on rice from lehigh coal.

Does the boiler overheat in the summer? I guess I am wondering what you hope to gain by reducing the feed?

i was having ash problems in summer alot of unburt coal sorry i dnt say that, the boiler temp was around 200 to 210 before i had proble with the bin feed worm then the boiler would pike to 250 deg but i also had timer wired diff.

I have run 3 teeth with no issues.

While I agree with Rob that in certain situations it will create longer run time without any real need, at other times it can conserve coal as well. Especially warmer months.

A very good draft will help maintain that 3 teeth setting without outfires.

Some folks probably wouldn't get away with it as easily as others and again, as Rob mentioned, those folks would end up running longer cycle times to maintain fire.

Probably a situational (is that a word?) decision for most folks....

ryan20strohl wrote:i was having ash problems in summer alot of unburt coal sorry i dnt say that, the boiler temp was around 200 to 210 before i had proble with the bin feed worm then the boiler would pike to 250 deg but i also had timer wired diff.

You should be able to achieve a nice burn with 4 teeth in the summer...there will be 'some' unburned coal in the ash, but if you think it is excessive I'd try some different coal.