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United States Stove 86620 Agitator Drive Shaft for Pellet and Multi-Fuel Stoves -- NBK Parts 20263
United States Stove 86620 replacement agitator drive shaft for pellet and multi-fuel stoves, also sold as NBK Parts 20263, fits US Stove 6039, 6100, 6220, 6500, 8500 and King Multi-Fuel 8500
US Stove Agitator Drive Shaft For Pellet & Multi-Fuel Stoves
  
List Price: $14.49
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Part Number: 86620
Manufacturer: United States Stove

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United States Stove Part 86620 / NBK 20263 Pellet and Multi-Fuel Stoves Agitator Drive Shaft -- Keep Your Burn Pot Moving

When the agitator stops turning, fuel clumps and your fire goes out. The US Stove 86620 is the OEM-spec replacement drive shaft that links the motor to the agitator bar, restoring reliable fuel movement in the burn pot of your pellet or multi-fuel stove. A lightweight but critical component, this is a direct drop-in fix for the affected models listed below.

Stop Clinkers, Restore Reliable Combustion

The agitator drive shaft is the mechanical link between your stove's feed motor and the agitator bar that stirs fuel inside the burn pot. Without it working correctly, pellets or multi-fuel media can bridge, pack, or clinker -- starving the fire and triggering fault shutdowns. Replacing a worn or broken shaft is one of the simplest repairs you can make to get your stove back to full output.

Part number 86620 (also catalogued under NBK Parts as 20263) is built to the same spec as the original factory component. At just 0.05 lbs it ships light, but order it before heating season so you have it on hand when you need it.

Direct Motor Connection

Designed to couple directly to the stove's agitator motor output, transmitting torque to the agitator bar without slippage or play.

Burn Pot Agitation

Keeps pellets and multi-fuel media moving so combustion stays consistent, reducing clinker buildup and low-heat fault codes.

Broad Model Coverage

Fits eight US Stove model numbers plus the King Multi-Fuel 8500 -- one part covers a wide installed base.

Lightweight Replacement

At 0.05 lbs this is an easy ship-and-stock part. Keep a spare on hand to avoid mid-winter downtime.

What the Agitator Drive Shaft Does

Pellet and multi-fuel stoves feed solid fuel into a burn pot where it is ignited and combusted. Over time, ash, clinkers, and compacted fuel can build up and prevent new fuel from burning cleanly. The agitator -- a small rotating bar or paddle inside the burn pot -- is driven by a dedicated motor to continuously stir the fuel bed. The drive shaft is the coupling between that motor and the agitator bar.

A cracked, bent, or stripped drive shaft will cause the motor to spin freely while the agitator bar stays still. Symptoms include:

  • Stove shuts down shortly after ignition (fuel not burning evenly)
  • Visible clinker buildup in the burn pot during inspection
  • Motor running but no audible movement from the agitator
  • Error or fault codes related to combustion or low heat output
OEM Cross-Reference: Part 86620 is also catalogued as NBK Parts number 20263. Both numbers refer to the same component. Use either when searching for this shaft.

Compatible Stove Models

Verify your model number on the data plate (typically located on the back or underside of the stove) before ordering.

  • US Stove models: 6039, 6039HF, 6039T, 6100, 6220, 6500, 8500
  • King models: Multi-Fuel 8500
Not sure if this fits your stove? Check the full model number on your stove's data plate and compare it to the list above. The 6039 series (including HF and T variants) and the 8500 series across both US Stove and King branding are the primary applications.

Installation Overview

This is a mechanical replacement part. General steps for most affected models:

  • Allow the stove to cool completely before beginning any service work
  • Disconnect power to the unit
  • Access the burn pot area and agitator motor assembly per your model's service layout
  • Remove the retaining fastener or clip securing the old drive shaft to the motor output and agitator bar
  • Install the new 86620 shaft, confirm it seats fully on both ends
  • Restore power and run a short test cycle to confirm agitator movement before relying on the stove for heat
Maintenance Tip: While the burn pot area is open, inspect the agitator bar itself for wear or deformation and clean out any ash or clinker buildup. Replacing the shaft on a clogged burn pot will restore agitation but not combustion efficiency -- a clean burn pot is equally important.
Spare Parts Strategy: Pellet and multi-fuel stoves rely on several small mechanical components that can fail unexpectedly during heavy heating season use. Consider keeping a spare agitator drive shaft on hand if this stove is your primary heat source.

Part Identification

ManufacturerUnited States Stove Company
Part Number86620
NBK Parts Number20263
SKU20263
Component TypeAgitator Drive Shaft
ApplicationPellet and Multi-Fuel Stoves

Physical Specifications

DimensionsApproximately 8-1/5" x 7-1/2" x 4-1/2"
Weight0.05 lbs

Compatible Models -- US Stove

Model 6039Compatible
Model 6039HFCompatible
Model 6039TCompatible
Model 6100Compatible
Model 6220Compatible
Model 6500Compatible
Model 8500Compatible

Compatible Models -- King

Multi-Fuel 8500Compatible

Function Reference

Role in SystemConnects agitator motor output to agitator bar in burn pot
Motion TransmittedRotational (motor torque to agitator bar)
Failure SymptomsNo agitator movement, clinker buildup, combustion fault codes
Important Information
  • Always shut off and fully cool the stove before performing any service or parts replacement.
  • Disconnect power to the stove at the outlet or breaker before accessing internal components.
  • Verify your stove's exact model number on the data plate before ordering -- this shaft fits specific models only (see compatibility list above).
  • This listing is for the drive shaft only. The agitator bar, motor, fasteners, and burn pot components are not included.
  • Dimensions listed (approximately 8-1/5" x 7-1/2" x 4-1/2") reflect the packaged part. Confirm fitment with your model number, not dimensions alone.
  • If your stove is under warranty, contact US Stove Company before replacing parts yourself to avoid voiding coverage.


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