Grate stuck on Harmon Mark III

Grate stuck on Harmon Mark III

PostBy: Thechap On: Thu Nov 29, 2007 7:08 am

Made it through the 1st night using the Harman Mark III and loving it. The coal burnt great and kept the 2000 plus square foot home at 75 degrees. Only one problem. I went to shake the coals down this morning and I believe a piece of coal or Slag(?) is stuck between the grates. Can't shake the fire down the rest of the way. I added coal to the remaining hot coals to keep the fire going until one of you guys can help! Will I have to leave the fire go out and then clean everything out or is there an easier way?

Stove/Furnace Make: Harmon
Stove/Furnace Model: Mark III

Re: Grate stuck on Harmon Mark III

PostBy: coaledsweat On: Thu Nov 29, 2007 8:30 am

Try shaking a little further and harder than normal, but don't really force anything. If it doesn't loosen up or break and start shaking, you will lose the fire. At that point, let it cool and clean it out and start over. When empty, try the grates and make sure they work without interference. It may just be a rock, when they hide in the coal they use coal dust as a disguise and are hard to pick out. I did find one in the 5300# I got last week. It sure looked like coal, but the rounded shape caught my eye, sure enough it was a rock.
Stoker Coal Boiler: Axeman Anderson 260M
Coal Size/Type: Pea

Re: Grate stuck on Harmon Mark III

PostBy: CoalHeat On: Thu Nov 29, 2007 9:35 am

When you started shaking, do you push the lever all the way back, or pull it all the way forward? With the 2 grate system on the Harman, the 2 grates move in the same way, if you go to far when shaking it will dump the contents in between the grates, you won't be able to move the lever back to center position. You should shake using short, chopping strokes, back and forth.

I've had instances where large clinkers or unburnt coal gets stuck between the grates, if I move the lever a little further it usually drops into the ash pan.

Pushing the lever all the way is useful when emptying the stove.

Shaking a Harman hand-fired takes practice, it's part of the learning curve associated with this stove.
Stoker Coal Boiler: 1959 EFM 350
Hand Fed Coal Stove: Harman Magnafire Mark I
Baseburners & Antiques: Sears Signal Oak 15 & Andes Kitchen Range
Coal Size/Type: Rice and Chestnut
Other Heating: Fisher Fireplace Insert

Re: Grate stuck on Harmon Mark III

PostBy: Dallas On: Thu Nov 29, 2007 10:09 am

You can also try "poking" it, either from the top or underneath. You might dislodge the problem or break it up.
Hand Fed Coal Stove: Modified Russo C-35
Other Heating: Oil Hot Air
Stove/Furnace Make: Russo
Stove/Furnace Model: Modified C-35