Harman Auger Motor with Chain & Sprocket Service

Posted on by Earth Sense Energy System
Mr. Blake Writes-

I have a Harman XXV pellet stove that is about 6 y/o. I believe I may need a new feed motor.  There is a low level grinding noise that occurs each time the feed motor is turned on.  I’ve cleaned the chain and sprockets.  The cam arm works w/out any apparent resistance.  Periodically there is a “bump” noise that comes from what seems to be a miss alignment of the chain on the center sprocket.  This is new as is the feed noise. If you have any thoughts on the source of the problem, I’d appreciate it.

Mr. Pellethead Replies-

Thanks for contacting us. By the description of it I would say the noise is coming from your auger motor gear box- my guess is that the grease inside has dried up and the gears are getting quite worn. Average life on those auger feed motors is 6-8 seasons. The ‘Bump’ noise is more than likely coming from the chain/sprocket and the chain jumping track.

1.Make sure the alignment of the sprockets appears in sync.

2.Check the teeth on the big and small sprocket.

3.Check the sawdust clean-out box in the feed system (door with wing nut behind auger motor) make sure it’s clean and that the slide plate doesn’t appear to be obstructed (Easiest to do with no fuel in the hopper).

More than likely the weak auger motor is what’s causing the chain to jump, but we do want to check those other items as well.

Click Here for the Chain Driven XXV Auger Motor

Click Here for the Harman Chain & Sprocket Kit

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4 Responses to Harman Auger Motor with Chain & Sprocket Service

Andrew says: March 8, 2017 at 8:14 pm

My feeder stopped feeding. I have power out of the pressure switch to the motor but the auger is not moving.

I need to determine if the motor is bad or if I have a jam in the auger area.

I cant move the chain or sprockets.

How do I disconnect the auger motor from the Harman XXV?

How do I disconnect the auger from the Harman XXV?

Earth Sense Energy System says: March 9, 2017 at 12:09 pm

Thanks for contacting us, happy to assist. Yes, I think the best option will be to pull the auger motor out and test to direct power. You can use an old extension or lamp cord, put two connectors on the end, attach to the motor leads and plug direct into the wall. This will let you know right away if the motor is working or not.

For removing the auger motor you will loosen the 4 bolts that hold the auger motor to the mounting plate. This will allow the auger motor to slide forward and your chain to have slack. Use an Allen wrench to loosen the small sprocket and it will pull off of the motor. From there you can disconnect the electrical wires and pull the auger motor out. MAKE SURE your stove is unplugged when working back there. Any questions let us know, we are happy to help.


Joy Brooks says: April 5, 2018 at 11:12 am

Harman XXV…4 yes old. Clean inside, back panels left & right removed. Hopper all pellets removed…just “Hums” nothing
Will start up…before it stopped the stove was extremely loud…almost like something was really strained on the inside to operate.

Earth Sense Energy System says: April 5, 2018 at 11:17 am

Hi Joy,

Sounds to me like your exhaust/combustion blower has stalled out. Be sure to check this motor and housing out. Without this blower, nothing in the stove will progress any further.


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