Harman PF100 Auger "Clunk"

DougInMaine

Member
Nov 19, 2012
10
I have what is probably an original Harman PF100. Within a few months of installation, I came to the conclusion that I knew more than the dealer (who did successfully install a replacement igniter). I've done all the cleanings, installed a new control board, added a remote programmable thermostat, and jury-rigged an automatic self-feeding system connected to a 3 ton pellet bag (proud of that one). Anyway, I feel more comfortable coming to this forum than working with the dealer.

The question: Each time the furnace's feed auger makes a rotation, there is a loud clunk sound. It's as if a rotating gear was missing a tooth. Not knowing what the deep internals look like, I can't figure out what is happening. Any thoughts or do I have to wait until the heating season is over and attempt a major tear-down?

Thank you!
 

rickwai

Minister of Fire
Nov 1, 2011
777
ohio
Have you cleaned out the fine collection area on the side of the feeder? If that is clean the check that the arm that the auger motor moves up and down moves with little effort. If so pull auger moter by loosening set screw and rotate auger by hand to check that it turns smoothly. Then put stove into ignition with auger motor disconnected from aiger and check for smooth rotation of the motor. U should find the problem with these steps
 

DougInMaine

Member
Nov 19, 2012
10
No fines; this was recently thoroughly cleaned. However, I watched the assembly while it went through some cycles and noticed that the motor base moved each time the hopper door opened. There are only 2 8 mm hex head screws holding this in place. I tightened one but the other was stripped. A little Loctite seems to have done the trick. If this doesn't hold, I'll try some silicone-based gasket seal.

Thank you!