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Technical Data Installation, Lubrication and Maintenance Information Chain Tension Adjustment The correct amount of slack in a roller chain drive is necessary for smooth operation. Measurement of mid-span movement is the best way to check that the chain is properly tensioned. After rotating one sprocket so that one side is tight use a straight edge to measure movement. Adjust center distances or idlers to achieve approximately 4% - 6% mid-span movement on drives which are horizontal to 45 degrees. . . 2% - 3% on drives which are 45 degrees to vertical, or subject to high shock loading. Lubricate between link plates and at the roller edge Recommended Mid-Span Movement Drive 10 Position (25 4) Horiz ontal 0.4 - 0.6 to (10 - 15) 45 de gre e s 45 de gre e s 0.2 - 0.3 to (5 - 8) Ve rtical Tange nt Le ngth Be twe e n Sprocke ts inche s or (mm) 20 30 50 70 (50 8) (76 2) (1270) (1778) 1 00 (2540) 0.8 - 1.2 1.2 -1.8 2.0 - 3.0 2.8 - 4.2 4.0 - 6.0 (20 - 30) (30 - 46) (51 - 76) (71 -107) (102 - 152) 0.4 - 0.6 0.6 - 0.9 1.0 - 1.5 1.4 - 2.1 (10 - 15) (15 - 23) (25 - 38) (36 - 53) 2.0 - 3.0 ( 51 - 7 6) Apply lubricant to the inside of the slack side Chain Tension Adjustment Lubrication The most effective way to assure long trouble free chain life is with proper lubrication. The correct selection of oil and the method of application depends on chain speed, chain load and temperature. The use of high quality non-detergent oils are recommended. Additives in oil may cause sludge build up and reduce the effectiveness of lubrication by preventing penetration into the chain joint. The highest viscosity oil which, under the conditions of the drive can penetrate into the chain, will form the thickest lm and offer the best protection to the drive. Oils should be applied to the inside of the slack side to prevent from being thrown off by centrifugal force. It should also be applied between the link plates to lubricate the pin/bushing bearing area and between the roller edges and roller link plates to lubricate the roller/bushing bearing area. Recommended Oil Viscosity vs Operating Temperature Lubricants for roller chain drives should have the following qualities: 1. Low enough viscosity to effectively penetrate into the chains internal bearing surfaces. 2. High enough viscosity to provide and maintain a suf cient lm of lubricant under the existing load conditions. 3. Be clean and free of corrodents or contaminants. 4. Have the ability to maintain good lubricating properties under the existing load and temperature conditions. The table below provides the recommended grade of oil at various operating temperature ranges: Re comme nde d Grade of Oil Te mpe rature de gre e s F Te mpe rature de gre e s C SAE 5 -50F to 50F -46C to 10C SAE 10 -20F - 80F -29C to 27C SAE 20 10F - 110F -12C to 43C SAE 30 20F - 130F -7C to 54C SAE 40 30F - 140F -1C to 60C SAE 50 40F - 150F 4C to 65C 135