Issue link: http://www.e-digitaleditions.com/i/206043
Technical Data Installation, Lubrication and Maintenance Information Certain minimum standards for installing and maintaining roller chains are assumed in designing, producing and specifying these products for service. If reasonable attention is paid to a few installation and maintenance procedures, roller chains will generally provide years of trouble free service life. The following are guidelines intended to help users get the most out of their roller chain purchase. We note that this information is offered only as a guide. Original Equipment Manufacturers may offer information which con icts with some items in this section. In these cases the user should follow the maintenance procedures as described by the Original Equipment Manufacturer. Steps Recommended for Installing Roller Chains on Drives Review the following steps when installing a new roller chain drive: 1. 2. 3. 4. 5. 6. Make sure all components are in good operating condition. Make sure sprockets and shafts are properly aligned. Connect the chain on the sprockets. Assure correct lubrication. Adjust the chain tension properly Assure appropriate guarding is in place. Condition of Components All components including chains, sprockets, shafts, bearings etc. should be in good running condition. Make sure that parts which exhibit excessive wear are replaced. We recommend that new chains operate on new sprocket tooth faces. This can sometimes be accomplished by rotating the sprocket, end for end, on non-reversing drives, so that the driving surface of the tooth is "unused". Shaft Alignment Shafts should be parallel within fairly close limits. We suggest using a machinist level or feeler bar to make sure the shafts are in the same plane. If shafts can move axially, lock them in place before attempting to align them. Tolerance for shaft alignment: Single strand chain drives: .050 in/ft (4.2 mm/m) or 1/4 degree High speed, high horsepower or multiple strand chain drives use the following formula: Tolerance = .00133*C/(P*n) [in/ft] or Tolerance = .111C/(P*n) [mm/m] Note: C = shaft center in inches or millimeters. P = chain pitch in inches or millimeters. n = number of chain strands. Alignment Of Shafts and Sprockets Correct alignment is necessary to prevent uneven loading and damaging loads on chains and sprocket teeth. Often poor alignment will manifest itself in rapid chain stretch or unusual wear on the chain link plates. There are two steps necessary to achieve proper alignment as follows: 1. 2. Make sure that the shafts are parallel. Make sure the sprockets are "in line" and not offset. The following two step procedure is recommended to assure properly aligned sprockets and shafts: Sprocket Alignment Use a straight edge (or piano wire) to align sprockets as shown above. Tolerance For Sprocket alignment Maximum Offset = 0.045P [inches or millimeters] Note: 134 P = chain pitch in inches or millimeters