Flexible couplings are relatively small in comparison to the equipment they tie together. However, they play a large role in equipment reliability. A coupling failure could cause significant downtime and maintenance costs.Couplings are mechanical connectors that transmit torque while accommodating shaft misalignment. Couplings preven inevitable shaft misalignment from causing stresses that could shorten the life of power-train components and cause downtime. Effects of engine operation on the lubricating oil used in it determine to a large extent the ability of the oil to maintain continuous lubrication and, consequently, of the engine to function efficiently.
Flexible couplings that employ metallic surfaces that slide and pivot will have a short life and contribute to unexpected downtime if not properly maintained. Proper coupling
maintenance includes selecting the proper coupling for the application; installing it with minimum misalignment; having frequent external inspections for leaks, missing or loose bolts, and vibration; and periodic realignment, relubrication, and internal inspections. Proper relubrication includes both checking that the coupling maintains a proper level of lubricant throughout the specified relubrication period and that upon relubrication, the coupling is taken apart, thoroughly cleaned, hand-packed with new grease, and seals replaced before reassembly. Relubrication without the practice of disassembly will contribute to premature coupling wear. Disassembly allows contaminants and spent lubricants to be removed. The coupling should be filled approximately 75 percent full.
The excessive quantity of fuel used when starting and warming-up a cold engine is the principal cause of dilution by fuel, water contamination is due to cold surfaces in the crankcase that condense the water vapor of combustion, dust enters the engine through the carbureter and breather-pipe and metallic particles wear off of the bearing surfaces most rapidly when wearing-in a new engine. Contamination by fuel reduces the viscosity of the oil, water forms an emulsion and, with carbon, dust and metallic particles, forms a sludge. All of these conditions are likely to have deleterious effects on the engine.
Reducing friction and reducing heat are only a couple of the reasons we use lubricants. If you look under a microscope at two surfaces moving across each other, you would see something that looks like two mountain ranges rubbing against one another. As this happens, pieces of the weaker material break off and create smaller abrasive particles, resulting in more broken off pieces, which go on to create more abrasion. It’s a vicious cycle, and the way we prevent this from occurring is by creating a lubrication film.