All Blog Posts about ‘Service & Maintenance’

Photo of the Week: Girth Gear Run-Out Procedure

This article was authored by:

Jenny Seim
Technical Writer

This week’s photo highlights a girth gear run-out procedure in action. A black strap (pictured) is mounted along the gear’s teeth. A dial indicator follows the strap’s path, and measures the tip of the teeth along the strap. This procedure reveals the amount of wear Continue reading →

 

Photo of the Week: Trunnion Skewing Adjustment

This article was authored by:

Jenny Seim
Technical Writer

This week’s photo highlights a trunnion skewing adjustment in action. A dial indicator (bottom left of photo) is used to measure the movement of the trunnion wheel bearings. If the bearings are not positioned correctly, they should be adjusted. The purpose of the trunnion skewing Continue reading →

 

Photo of the Week: Refurbished Tire and Trunnion Wheel

This article was authored by:

Jenny Seim
Technical Writer

Today’s photo highlights a refurbished tire and trunnion wheel. Rotary drum tires and trunnion wheels can become worn over time, resulting in a variety of unwanted characteristics such as pitting, spalling and timing marks. If the wear is left untreated, the weight of the drum Continue reading →

 

Photo of the Week: Damaged Thrust Roller

This article was authored by:

Jenny Seim
Technical Writer

Our photo this week is a damaged thrust roller. Damage occurred because the thrust roller either stopped rotating, and the rotary drum ran hard against its left side. The thrust could also have become damaged as a result of a bearing failure; the bearing may Continue reading →

 

Photo of the Week: Damaged Rotary Drum Tire

This article was authored by:

Jenny Seim
Technical Writer

This week’s photo shows a damaged rotary drum tire. Tires can become damaged if: They are worn too thin. The mounting blocks get worn, causing excess tire creep and movement. The shell is distorted from over heating/cooling the drum. The tires are shimmed too tight. Continue reading →

 

Question of the Week: What are Ball and Tube Knocking Systems?

This article was authored by:

Jenny Seim
Technical Writer

Ball and tube knocking systems are used to combat material build-up inside of a rotary drum. Here’s how they work: tubes, which hold solid balls, are attached to the drum’s exterior. While the drum rotates, the tubes drop the balls on the drum via gravity. Continue reading →

 

Question of the Week: What is Rotary Drum Tire Creep?

This article was authored by:

Jenny Seim
Technical Writer

The circumference of the inside diameter of a rotary drum tire is larger than the circumference of the outside diameter of the shell, and therefore the tire will not make a complete revolution at the same time as the shell. This difference per revolution between Continue reading →

 

Photo of the Week: Replacement/Spare Thrust Rollers

This article was authored by:

Jenny Seim
Technical Writer

This week’s photo highlights one of FEECO’s many replacement/spare parts: the thrust roller. Thrust rollers are a standard component to any rotary drum, from rotary dryers and coolers, to granulators and kilns. They ride on the downhill and uphill edge of the tire, and are Continue reading →

 

Photo of the Week: Tire Mounting Styles

This article was authored by:

Carrie Carlson
Technical Writer

This week’s photo shows two different rotary drum tire mounting styles: the wedged and pinned mount (at left), and the floating mount (at right). Traditionally, wedged and pinned mounts were used to mount the tire to the shell of the drum. And while they offer Continue reading →

 

Question of the Week: What are the Signs it is Time for Tire Grinding?

This article was authored by:

Jenny Seim
Technical Writer

Rotary drum tires and trunnion wheels can become worn over time, and result in the following changes:         Chattering or vibrational noises Pitting Spalling Rolled over edges Timing marks Ridges Taper wear Washboarding The characteristics mentioned above can cause the weight of Continue reading →