Feeder-Breakers Support

Feeder-Breaker Maintenance

How are the breaker roll picks replaced?

The pick roll is available with various surface configurations to suit individual application requirements. Snap rings or expansion rings typically hold the picks in place in the bit holder. When the bits/picks need replaced, the snap ring is removed and the bit/pick is removed from the holder. The process is reversed for the installation of a new bit/pick.

How do you check/adjust chain tensioning?

The conveyor chain on a McLanahan Feeder‑Breaker operates most efficiently with a slight amount of slack present on the return side. Check the tension at the discharge end of the machine where the chain returns off of the head shaft. Do not allow the returning chain to be pulled tight or hang loose. The proper condition is to have the chain be slightly slack and with constant tension.

For chain tensioning, use the hydraulic hand pump to pump oil/grease into a take-up cylinder on both sides of the tail shaft. Once oil/grease has been injected into the cylinder, the chain is held in place by means of steel shims.The procedures for tightening and loosening the chain can be found in the Installation, Operation and Maintenance Manual.

How are the chain and flight bars replaced?

The conveyor on a Feeder‑Breaker is comprised of heavy-duty flight bars attached to a chain assembly.  A mark is placed on the disassembly link to facilitate disassembly of the conveyor chain. Please refer to the Maintenance manual for the complete replacement procedure.

How do you adjust for product size?

Increasing product size

  1. Remove the shims from above the bearing housing. The amount of shims removed will correspond to the desired increase in product size.
  2. Raise the crusher roll assembly to the desired height.
  3. Insert the shims from step 1 beneath the bearing housing.
  4. Raise the motor/reducer base by the same amount as the roll assembly.
  5. Insert the appropriate shims beneath the motor/reducer base.

Decreasing product size

  1. Raise the crusher roll assembly slightly to relieve the weight from the shims beneath.
  2. Raise the motor/reducer base slightly to relieve the weight from the shims beneath.
  3. Remove the shims from beneath the motor/reducer base The amount of shims removed will correspond to the desired decrease in product size.
  4. Lower the motor/reducer base to the desired height.
  5. Remove the same amount of shims from beneath the bearing housing as were removed from beneath the motor/reducer base.
  6. Lower the bearing housing to the desired height.
  7. Insert the shims from step 5 above the bearing housing.

Operational Best Practices

What kind of feed configuration do I need?

Feeder-Breakers can be designed to accept various feed configurations, including installation under hoppers in a truck dump application, dozer trap configurations, as well as being fed by FELs.

What are the product sizes achievable with a Feeder-Breaker?

In most applications product sizes range between 6” and 12”.

What is the difference between electro-mechanical drive arrangements and hydraulic conveyor drive arrangements?

Both electro-mechanical and hydraulic drives are attached to the head shaft of the conveyor. The electro-mechanical drive configuration consists of an electric motor, coupling and reducer. The hydraulic drive is made up of a hydraulic motor and is powered by a hydraulic power unit.

Recommended Spare Parts List

McLANAHAN CORPORATION recommends that you keep certain Feeder-Breaker replacement parts at your facility.

Part Name


Breaker Bit36
Breaker Bit Block36
Head Shaft/Bearing Assembly 1
Tail Shaft Assembly1

Looking for more info on Feeder-Breakers?


Need Some Help?

Our customer service team is here to help you 24/7. We can ship you parts, send field service technicians to your site and answer any questions you have. Whatever you need, we are here for you.