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TRUNNION BEARINGS
TRUNNION BEARINGS INFORMATION
Trunnion bearings support the trunnion wheels. Like trunnion wheels, trunnion bearings must be quite stout. Two bearings support each trunnion wheel.
To be effective and long lasting, a trunnion bearing must be able to handle some misalignment and thrust. The symptoms displayed at your plant will determine whether you need to focus on a self-adjusting bearing or a double-taper-lock bearing
TO IDENTIFY TRUNNION BEARING ISSUES, LOOK FOR THESE SYMPTOMS:
- Failed Bearings Internals. Signs of failed internals include powder formation, jerky movement, halted movement, rollers falling out, rusty-looking grease, increased bearing vibrations and bearings heating.
- Failed Bearings Externals. Signs of failed external bearing components include housing cracks at the setscrew, broken or cracked lock collars, and the shaft slipping inside the lock collar.
- Bearings misalignment
- Bearings that do not properly handle thrust.
When these symptoms are present, immediate action should include changing the bearings. Changing the bearing type may help. Another common fix is changing the greasing frequency.
BEARINGS UPGRADE
Trunnion bearing upgrade Why? And How?
The benefits of extending trunnion bearing life to your dryers are the following: Extended life cycle, lower maintenance costs and the elimination of production outages caused by premature bearing failure.
As a guide, the average type E bearing life is 1 to 2 years. Retrofitting using an upgraded trunnion and larger Dodge P4B-415R option will extend service life from 5 to 10years.
For a long term solution PRE has engineered the following upgrade. We use a 4 15/16” Dodge Imperial bearing, new bearing plates, and adjuster blocks, keeping the center line of the dryer the same. Precision Rotary Equipment has developed a “proven project” which to accommodate this.
