Magnum stoker not pushing the coal

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Jimmyjames
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Joined: Fri. Oct. 19, 2018 8:45 pm
Hot Air Coal Stoker Stove: Harman magnum stoker

Post By: Jimmyjames » Fri. Oct. 19, 2018 8:53 pm

Third season using this stove. Replaced the pusher block last year. Everything is moving, but the pusher isn’t pushing the coal. There seems to be a lot of play at the pusher rod. The pusher tube doesn’t stay tight to the weldment. Thoughts? Do I need to replace the weldment piece?

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McGiever
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Posts: 7268
Joined: Sun. May. 02, 2010 11:26 pm
Stoker Coal Boiler: AXEMAN-ANDERSON 130 "1959"
Hand Fed Coal Boiler: BUCKET A DAY water heater
Hand Fed Coal Stove: Warm Morning 414A
Coal Size/Type: RICE,PEA,NUT,STOVE /ANTHRACITE and EGG / BIT
Other Heating: Ground Source Heat Pump and some Solar
Location: Junction of PA-OH-WV

Post By: McGiever » Fri. Oct. 19, 2018 9:55 pm

Welcome Jimmy!

The weldment or "Fork" needs to be no wider than 1-3/4"...it will and does get spread wider as a safety instead of ruining the gear-motor due to a stuck or hard to move "pusher block". Wet coal fines will form a cement type of "crud" that locks up the pusher while that powerful motor keeps driving on...something has to give...and gear-motors are high dollar...

A big pair of Channelocks or water pump pliers can often times squeeze the gap back into specs.

A bit of reading for ya Jimmy:
Harman Stoker Stuck
Last edited by McGiever on Sat. Oct. 20, 2018 9:32 am, edited 1 time in total.

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titleist1
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Posts: 4799
Joined: Wed. Nov. 14, 2007 4:06 pm
Hot Air Coal Stoker Stove: Harman Mag Stoker - 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
Location: Cecil County, MD

Post By: titleist1 » Sat. Oct. 20, 2018 7:32 am

McG's fork suggestion is probably the culprit. One other thing I have seen is the threaded rod and tube should be tight to the back of the pusher block. If they are loose it also won't feed coal correctly.

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Jimmyjames
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Posts: 2
Joined: Fri. Oct. 19, 2018 8:45 pm
Hot Air Coal Stoker Stove: Harman magnum stoker

Post By: Jimmyjames » Sat. Oct. 20, 2018 9:54 am

Thanks to you both. There was some slop between the tube and the fork assembly. The block wasn’t being pulled back the whole way. I shimmed it so that it is getting pulled back further and seems to be working now. Just need to dial in flow now.

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McGiever
Member
Posts: 7268
Joined: Sun. May. 02, 2010 11:26 pm
Stoker Coal Boiler: AXEMAN-ANDERSON 130 "1959"
Hand Fed Coal Boiler: BUCKET A DAY water heater
Hand Fed Coal Stove: Warm Morning 414A
Coal Size/Type: RICE,PEA,NUT,STOVE /ANTHRACITE and EGG / BIT
Other Heating: Ground Source Heat Pump and some Solar
Location: Junction of PA-OH-WV

Post By: McGiever » Sat. Oct. 20, 2018 9:59 am

Jimmyjames wrote:
Sat. Oct. 20, 2018 9:54 am
Thanks to you both. There was some slop between the tube and the fork assembly. The block wasn’t being pulled back the whole way. I shimmed it so that it is getting pulled back further and seems to be working now. Just need to dial in flow now.
JimmyJ, Hope you noticed I edited the fork measurement, it was incorrect before.

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titleist1
Member
Posts: 4799
Joined: Wed. Nov. 14, 2007 4:06 pm
Hot Air Coal Stoker Stove: Harman Mag Stoker - 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
Location: Cecil County, MD

Post By: titleist1 » Sun. Oct. 21, 2018 7:50 am

Glad it's working for you again! I am about a week away from firing up for the season.

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