sec 01 standard - Renold Jeffrey

1 11/19/08 11:38 AM Page 203. chain Installation and Maintenance 29. technical Information The following precautions must be Guards must be provided on all taken before disconnecting and chain and sprocket installations removing a chain from a system in the USA in accordance with prior to replacement. the provisions of ANSI/ASME. "safety standards for Always shut off power switch to mechanical power transmission isolate equipment before installing, apparatus" and ANSI/ASME. removing, lubricating, or servicing "safety standards for a chain system. conveyor and related equipment". or other applicable safety standards.

2 Connecting and disconnecting When revisions of these standards chain - always use safety glasses are published, the updated editions to protect your eyes. shall apply. Always loosen tensioning devices. Never reuse individual components. Support the chain to prevent uncontrolled movement of chain Never reuse a damaged chain and parts. or chain part. Do not attempt to connect or roller chain lubrication - this disconnect chain unless you know chain requires lubrication. See the chain construction. for guidance on lubrication. Use of correct extractor tools is recommended. Tools must be in good condition and properly used.

3 Note: Failure to follow these practices Consult manufacturer or authorized could result in damage, serious injury, distributor for complete assembly or death. or disassembly procedures. If chain is to be used on high speed or heavily loaded applications, it is recommended that the use of crank link joints be avoided. advancing chain technology 203. 11/19/08 11:38 AM Page 204. 29 chain Installation and Maintenance technical Information Introduction Care must be taken with sprockets of split design to ensure perfect adjoining of the faces of each half. Proceed Renold has more than 100 years of experience in the with the key fitting after the halves are finally bolted together, operation and maintenance of roller chain .

4 Involvement otherwise the key can prevent correct assembly and with designers, manufacturers, and users of all types of subsequently result in malgearing. equipment has enabled Renold Jeffrey to develop this Verify that key heads will not project beyond the width of definitive guide, designed to pass on the preferred any chain cases. methods of correct handling, adjustment, installation, and maintenance of roller chain drives resulting in maximum chain life. Checking Sprocket Alignment Accurate alignment of shafts and sprocket tooth faces The notes given below are general recommendations provides a uniform distribution of load across the entire chain and should be followed in the selection and installation width and contributes substantially to maximum drive life.

5 Of a chain drive in order that satisfactory performance and drive life may be ensured. Should you require any further information, please contact our technical sales staff. Equipment Needed Break chain with a Renold chain Extractor: 10101 for chains from to pitch 10102 for chains from to pitch For joining any chain up to pitch, a drift punch will be required. Construction of medium or heavy chain drives requires millwrighting equipment such as lifting tackle, slings, wedges, packing, etc. Use a straightedge across the machined faces of the OTHER USEFUL EQUIPMENT sprockets in several different positions, if possible, as a Quantity of inner and outer links check against wobble.

6 A nylon or similar line is a good Straight edges and/or strong, fine line substitute for a straightedge, particularly on longer center Spirit level distances. Plumb line Should endwise float of shafts be present, make due Selection of hammers, files, key blanks, etc. allowance so that sprocket alignment is correct at the mid position of float.. Preparation Check equipment to ensure that general transmission When alignment is correct within closest practical limits, requirements are correct ( flexible couplings, flywheel, drive the keys home and take a final check on sprocket means of drive adjustment). alignment.

7 Check condition and rigidity of the shafts and bearings, particularly if there has been considerable previous service with an alternative method of transmission. Replace or correct if necessary. Driver and driven shafts should be checked to ensure they are level and parallel to each other. This also applies to the idler shaft, if present. Use a spirit level and adjustable comparator bar or micrometer between shafts at extreme points on each side of the drive. Correct any parallelism errors and mark a permanent data line for the adjustable shaft. Place sprockets or respective shafts in approximate alignment and fit the keys in accordance with correct engineering practice.

8 Do not secure keys at this stage. 204 advancing chain technology 11/19/08 11:38 AM Page 205. chain Installation and Maintenance 29. technical Information Important Note chain cases Sprockets should always be designed to be as close to the Position the chain case bottom sections with the shafts supporting bearings as possible. concentric in their cavities. Manufacture suitable mountings and brackets to ensure Installation of chain rigidity. Renold chain should not be assembled on the sprockets Assemble the oil supply and return pipe system and the until attention has been paid to: drive to the oil pump. 1.

9 Cleanliness of the sprocket teeth, particularly if debris of Assemble top section(s) of chain case. an abrasive nature (cement dust, weld spatter, etc.), has been prevalent while work was in progress. Fill the oil sump and check delivery to the chain . 2. Temporary positioning of the lower section of a chain chain Adjustment case, if present. In restricted spaces, maneuvering of To maximize chain life, some form of chain length adjustment large sections is often simplified by using the spaces must be provided, preferably by moving one of the shafts. between shafts that will later be occupied by the chain . (See diagram three on page 206.)

10 If shaft movement is not Ensure the chain is clean and free of debris and place possible, an adjustable idler sprocket engaging with the around the sprockets, observing instructions where unloaded strand of the chain is recommended. Generally, matched strands are involved. In chain with two or more the idler should have the same number of teeth as the strands, joining is most easily accomplished at the mid- driver sprocket and care should be taken to ensure speed span of the drive, drawing the chain ends together with a does not exceed the maximum ratings shown. chain clamp or rope tackle block. Ensure that the strength The chain should be adjusted regularly so that with one of the drawing tackle is sufficient to hold the chain .