U.S. TSUBAKI STOCK SPROCKETS
MAINTENANCE CHECKLIST
LINK PLATE WEAR Wear on edges of outer sides of link plates may be caused by chain contacting a case or fixed object. Remove or relocate fixed object. Readjust chain properly. EXCESSIVE NOISE Can be caused by broken links and chain rollers, extreme misalignment, elongation, chain jumping sprocket teeth, loose sprockets, broken teeth, accumulation of dirt packed into the chain or sprocket teeth, interference by foreign objects, or contacting a fixed object. Check for worn, broken, or missing parts. Check align- ment of shafts and/or sprockets. EXCESSIVE VIBRATION Unbalanced rotating parts, broken or missing rollers, too much chain slack, loose or misaligned sprockets or shafts. Inspect chain and drive equipment. Replace or readjust as needed. IMPROPER LUBRICATION Light or dark brown discoloration of pin-bushing joints and connecting link pins, or brown-red oxide color in oil may indicate chain is not dipping into the oil reservoir, or drip lubricator or spray is plugged. Carefully clean and dry chain, immerse in oil, and reinstall. Change oil in chain case and flush case. Determine that oil supply is adequate and unimpeded. SUGGESTED REPLACEMENT PROCEDURES Chain parts should never be altered or tampered with by makeshift repairs and/or with parts or components which have not been authorized by the company.
Regardless of the application, all chain systems should be inspected on a regularly scheduled basis for worn, damaged or broken parts, possible interference by other system components, and proper lubrication. Normal main- tenance procedures can prevent most of the conditions described below. Carefully inspect roller chain drives on the same schedule as associated equipment. SPROCKET MISALIGNMENT Wear on the sides of sprocket teeth generally indicates improper installation of sprockets and/or shafts. If shafts are out of parallel or not in the same plane, non-symmetrical wear will appear on sprockets or chain rollers. After proper alignment is made, retighten set screws in sprocket hubs. CHAIN WEAR AND ELONGATION Normal wear will cause some increase in chain length. However, if a sudden increase in elongation occurs, look for severe wear on the tips of sprocket teeth. This may be caused by any of the following: excessive loading or shock loading, displacement and/or wear in bearings, displacement of takeups, or under-designed drive. Elongation of 3% or more may be an indication that chain and/or sprockets should be replaced. Before replacing chain or sprockets, recalculate initial drive design. Check chain for broken parts. Check chain tension if there is too much accumulated slack in the drive. BROKEN CHAIN PARTS Generally caused by an overload drive, extreme misalign- ment, excessive elongation causing chain to jump sprock- et teeth, heavy shock, improper drive design geometry, or foreign objects. Recalculate initial drive design and make necessary cor- rections. Inspect sprockets and shafts for proper align- ment or looseness.
WARNING
!
USE CARE TO PREVENT INJURY COMPLY WITH THE FOLLOWING TO AVOID SERIOUS PERSONAL INJURY: 1. Guards must be provided on all chain and sprocket installations in accordance with provisions of ANSI/ASME B15.1—2000 (R2008) “Safety Standards for Mechanical Power Transmission Apparatus,” and ANSI/ASME B20.1— 2012 “Safety Standards for Conveyors and Related Equipment,” or other applicable safety standards. When revisions of these standards are published, the updated edition shall apply.
2. Always lock out the power switch before installing, removing, lubricating or servicing a chain system.
3. When connecting or disconnecting chain: a. Eye protection is required. Wear safety glasses, protective clothing, gloves and safety shoes. b. Support the chain to prevent uncontrolled movement of chain and parts. c. Use of pressing equipment is recommended. Tools must be in good condition and properly used. d. Determine correct direction for pin/rivet removal or insertion.
UST-86 REV. 2-13
www. ustsubaki .com
224
225
Made with FlippingBook Digital Proposal Creator