Harman Magnum feed issue.

Harman Magnum feed issue.

PostBy: wolfehunter On: Fri Jan 31, 2014 2:40 pm

I am new to this forum as I stumbled upon it looking for information on my coal stoker. It looks like a lot of good information can be found here so thought I would ask for some ideas from some experienced stoker guys. I have had this stoker for 5 seasons. I bought it used from my cousin who went to a coal furnace. It has worked flawlessly until this year as I am having some feed issues. It will burn great for a few days or up to two weeks and without warning will stop feeding. Feed motor and pusher block still sliding back and forth but coal not moving. I can manually pull pusher block all the way back on the back stroke and it will feed for a few strokes but then stop. I noticed at times the adjustment handle on the pusher block not being accurate also. The fire will be 4 inches wide so I turn it clockwise one turn (which should increase fire 1 inch) and within an hour it is pushing hot coals off the grate. I did notice my hopper has some corrosion on it so I took it off and cleaned it up repainting it but still acting up. I am very frustrated. What makes these drastic changes occur? I am starting to think there is a ghost in my house or is my wife is secretly making adjustments to drive me crazy!! Anyone have any suggestions?
wolfehunter
 
Hot Air Coal Stoker Stove: Harman Magnum Stoker
Coal Size/Type: rice

Re: Harman Magnum feed issue.

PostBy: McGiever On: Fri Jan 31, 2014 5:17 pm

Sporatic operation could come from controller acting up.
Try choosing different settings for a while and see how it reacts.
McGiever
 
Stoker Coal Boiler: AXEMAN-ANDERSON 130 "1959"
Hot Air Coal Stoker Stove: HARMAN MAGNUM
Hand Fed Coal Stove: RADIANT HOME AIR BLAST
Baseburners & Antiques: OUR GLENWOOD 111 BASEBURNER "1908"
Coal Size/Type: PEA / ANTHRACITE, NUT-STOVE / ANTHRACITE
Other Heating: Ground Source Heat Pump
Stove/Furnace Make: Hydro Heat /Mega Tek

Re: Harman Magnum feed issue.

PostBy: lewis On: Fri Jan 31, 2014 6:28 pm

I'd prolly shut it down and clean it all real good including the blades of the combustion blower and air feed under the grates.

Other items to consider is if you have changed coal or is your coal wet also is it the pent roof design with the cleaning chain or the OLD Flat top like i got then ya def need to pull the pipe and clean.

Most feed problems originate in the area of the fork and cam an entire full turn of my feeder adj is a huge adjustment I never have to adj more than a 1/4 turn. could the cam be slipping on the motor shaft or is the fork bent from forcing a foriegn object thru the feeder.

Just some ideas they aren't complicated and just watching it operate for a half our or so could point the trouble out.
lewis
 
Stove/Furnace Make: Harman
Stove/Furnace Model: Old Model Magnum

Visit Lehigh Anthracite

Re: Harman Magnum feed issue.

PostBy: RAYJAY On: Fri Jan 31, 2014 9:35 pm

here is a drawing( PDF attached ) of how the mag lever should look, i have also had had the dust block up the push block, i just help the push block in and out a couple of times and it will be ok after that, or if you do shut it down puill the hopper off to clean the block out better

Jeff
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RAYJAY
 
Stoker Coal Boiler: VAN WERT - 600 VA HOT WATER
Hot Air Coal Stoker Stove: HARMAN- MAGUM STOKER
Coal Size/Type: BUCKWHEAT ON BOTH
Other Heating: NG BOILER

Re: Harman Magnum feed issue.

PostBy: dcrane On: Fri Jan 31, 2014 9:44 pm

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dcrane
 
Hand Fed Coal Stove: Crane 404

Re: Harman Magnum feed issue.

PostBy: titleist1 On: Fri Jan 31, 2014 11:42 pm

the only time i ever had feed issues was due to wet coal.

if coal is dry, then i'd look to see how the fit is for the pusher block making sure there are no gaps around the block that the coal is sliding past it. DO you only get powdery fines in the fines tray or are there bigger pieces?
titleist1
 
Hot Air Coal Stoker Stove: Harman Mag Stoker (old style) one in basement, one in workshop
Hand Fed Coal Stove: Harman Mark III on standby for long power outages
Coal Size/Type: Rice/Anthracite; Nut/Anthracite

Re: Harman Magnum feed issue.

PostBy: wolfehunter On: Sat Feb 01, 2014 7:10 pm

Mine is the old flat top design and I do not have a fork but an egg shape closed design. I have the entire thing apart and will clean everything very well. I am only getting fines in the tray. Noticed some corrosion on the main feeder body right in front of where the pusher block slides. Could this be a problem? But why will it feed great for several days and then stop if that was the problem? And as I said, the pusher block keeps sliding but no coal is moving so I do not think it is the controller. I think it is a mechanical issue but won't rule anything out. Would it be wise to use some high heat JB Weld and putty knife over the corroded spots? One spot looks to be like 1/4" deep and the size of a quarter. Thanks for the suggestions......I need to go clean all the dust out of the top part of the stove. Quite a build up in there. I don't have a long brush....any suggestions how to get that all out of there?
wolfehunter
 
Hot Air Coal Stoker Stove: Harman Magnum Stoker
Coal Size/Type: rice

Re: Harman Magnum feed issue.

PostBy: Horace On: Sat Feb 01, 2014 8:22 pm

wolfehunter wrote:I need to go clean all the dust out of the top part of the stove. Quite a build up in there. I don't have a long brush....any suggestions how to get that all out of there?


If you mean the flyash that collects under the collar where the stove pipe hooks in, I cut the handle off an old canister vac so that I could slide it around in there and get everything. Works great!

Does this thread help with your problem?

harman ST8-VF8 stocker stove
Horace
 
Hot Air Coal Stoker Stove: Harman ST8-VF8 / Frankenstove

Re: Harman Magnum feed issue.

PostBy: RAYJAY On: Sat Feb 01, 2014 8:43 pm

hate to say this but how is your grate ??
RAYJAY
 
Stoker Coal Boiler: VAN WERT - 600 VA HOT WATER
Hot Air Coal Stoker Stove: HARMAN- MAGUM STOKER
Coal Size/Type: BUCKWHEAT ON BOTH
Other Heating: NG BOILER

Re: Harman Magnum feed issue.

PostBy: wolfehunter On: Sat Feb 01, 2014 9:29 pm

I think the thread is helping as I am learning some things but my problem is not resolved. There was a lot of dust like fly ash accumulated on the top of the stove. I got my son to reach in with his smaller hands/arms and we used one of his pliable rulers from school to get the whole top cleaned out. I usually only do that at the end of each season but there was a lot up there already. Had to be hurting my draft. I have been carrying coal from my shed in 5 gallon buckets and putting it in plastic 55 gallon barrels my wife got from work. Water accumulates on the bottom and I'm wondering if the coal never has a chance to "thoroughly" dry out in those barrels. We drilled holes in the bottom of them now so maybe coal will dry better. Will damp coal get hung up in the hopper or above the pusher block and mess up feeding? Just thinking that the reason it burned good for several days was I was getting coal out of the top of the barrels where coal was dryer and then got down to the damp coal in the bottom half of the barrel. Can coal look dry but actually still be damp? Boy do I have lots to learn!
wolfehunter
 
Hot Air Coal Stoker Stove: Harman Magnum Stoker
Coal Size/Type: rice

Re: Harman Magnum feed issue.

PostBy: wolfehunter On: Sat Feb 01, 2014 9:37 pm

Oh, the grate is smooth. There were a couple of holes blocked with ash/coal but I poked them out. It has only been on for 2 years. Place I work part time has a magnum that burned through and they are scrapping it. boss told me I could rob parts off of it. Basically looks like mine on the outside but has two small grates instead of one large one and there is a V shaped piece of metal above the fireblocks. I am going to strip it as I may be able to use parts from it.....doors and all. Looks like the little grates lift right off but the thing they sit on looks cemented to the feeder assembly. Also a very rusty hex head screw on the front of it. Gonna be lots of fun getting that out of there!
wolfehunter
 
Hot Air Coal Stoker Stove: Harman Magnum Stoker
Coal Size/Type: rice

Re: Harman Magnum feed issue.

PostBy: lewis On: Sun Feb 02, 2014 12:11 am

Good to see you cleaned it !

I use the Conical tool that comes with a shop vac and insert a piece of clear PVC tube from the hardware store its a perfect fit and I vacuum it out thorough to all the corners. then I use another hardware store handy called a Dishwasher cleaning brush up the Channels in the stove body and a swipe around inside the top with another vacuuming.

I wouldn't worry about the SPOTS and I def wouldn't put any JB Weld in there. Its a hard direct drive set up so if the motors running and the coals dropping that blocks pushing it some where. Im thinking your close with the wet coal problem that's a No - No.
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lewis
 
Stove/Furnace Make: Harman
Stove/Furnace Model: Old Model Magnum

Re: Harman Magnum feed issue.

PostBy: titleist1 On: Sun Feb 02, 2014 9:58 am

wolfehunter wrote:Water accumulates on the bottom and I'm wondering if the coal never has a chance to "thoroughly" dry out in those barrels. We drilled holes in the bottom of them now so maybe coal will dry better. Will damp coal get hung up in the hopper or above the pusher block and mess up feeding?


THIS^^^^
Rice coal holds moisture and while damp coal is OK, wet coal does not feed well at all. Check the edges of your hopper outlet for corrosion too. I had a couple plastic buckets of coal at the end of one season sit in the basement and in July the coal in the bottom of those buckets was still very wet. The top few inches dried out but it seemed that top layer of coal kept anything below that from evaporating.

When I used the buckets I had about 10 of them in the basement near the stove at a time. I would fill the hopper with drier coal from the tops of the buckets and work my way from bucket to bucket letting them dry over a couple days. The stuff at the bottom was still damp by the time i got to it.
I did not have holes in the buckets, I didn't want the water draining onto the basement floor.
titleist1
 
Hot Air Coal Stoker Stove: Harman Mag Stoker (old style) one in basement, one in workshop
Hand Fed Coal Stove: Harman Mark III on standby for long power outages
Coal Size/Type: Rice/Anthracite; Nut/Anthracite

Re: Harman Magnum feed issue.

PostBy: Hambden Bob On: Sun Feb 02, 2014 11:46 am

Wet Coal and Stokers generally don't mix. You're finally getting it. Titleist brought this up early in this Thread. Stop fighting your wet Rice. Be one with the dry,debris free rice. Your stoker is an excellent heat-maker. Feed it correctly,and it will Love You long time with bullet-proof operation. That's why I love my old Dane Harman built Magnum.
Hambden Bob
 
Hot Air Coal Stoker Stove: Harman 1998 Magnum Stoker
Coal Size/Type: Rice-A-Roni !

Re: Harman Magnum feed issue.

PostBy: RAYJAY On: Sun Feb 02, 2014 1:31 pm

if wet rice is a problem feeding you can burn buck in that stove, that is all i burn in mine

jeff
RAYJAY
 
Stoker Coal Boiler: VAN WERT - 600 VA HOT WATER
Hot Air Coal Stoker Stove: HARMAN- MAGUM STOKER
Coal Size/Type: BUCKWHEAT ON BOTH
Other Heating: NG BOILER

Visit Lehigh Anthracite