A neglected grease distribution system can wreak havoc on wood pellet mill roll bearings, leading to grease contamination, clogged strainers and uneven lubrication, all of which can increase the risk of premature bearing failure.&nbsp; To mitigate contamination, the grease source should be stored in a drum or tote, in a clean room as far away from the mill(s) as possible. Drum covers should always be secured, and attachments to drums and totes should be sealed. When changing the grease container, avoid letting the stinger touch the ground or any dirty surface, minimizing the time the container is open. &nbsp;Perform grease container changes when the mills are not in operation or between pump demand periods.The grease distribution pump should be regulated for proper flow of grease through the grease distribution system and into the roll bearings at a rate controlled by divider blocks. Grease distribution pumps are normally pneumatically operated, and discharge pressure is adjustable. &nbsp;The grease pump air regulators should be monitored daily.Contaminated grease shortens the service life of grease strainers, which typically contain 40 to 100 mesh stainless steel screens. These screens prevent contaminants from reaching the divider blocks, but can become clogged with thickener components, wood dust and debris. Using lithium complex greases like Mystik® JT-6® High Temp #2 or Mystik LithoPlex® Pellet Mill #2 reduces the risk of clogging. &nbsp;To prevent damage to the strainer mesh, remove and clean the strainer cartridges with solvent at a prescribed interval or by monitoring the pressure differential across the strainer.After cleaning, adjusting or servicing distribution system components, verify that the proper grease flow is achieved at the press tie-in. &nbsp;Many systems have a timed servo valve integrated with the divider block to control the amount of grease released to the roll bearing. &nbsp;Before closing the press door for service, the volume and timing of grease release from each supply tube should be measured at the press to ensure it reaches the roll bearings. &nbsp;Preventative maintenance and attention to the grease distribution system can protect the roll bearings and reduce downtime.

SPOTLIGHT | CITGO: Pellet Mill Grease Distribution System Maintenance

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