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6. Check the end clearances between impellers and <br />headplates. Adjust clearances per B-15 below. <br />7. When clearances are correct, clean and re -install <br />the gearhouse. Check condition of flange gasket <br />(7) and replace if questionable. Fill gearhouse to <br />correct level with proper grade oil. <br />B - Replacing Shaft Bearings and Impellers <br />Remove coupling or sheave from the drive shaft. <br />Drain and remove gearhouse, and pull the timing <br />gears. If gears are to be re -used, mark them so <br />they may be returned to the same shafts. <br />1. Break corners and deburr the keyway. Remove <br />bearing end cover at the drive end. Remove <br />bearing clamp plates (34). <br />2. Make single and double identifying punch marks <br />on the mating edges of headplate and cylinder <br />flanges at the two ends of the blower. <br />3. At the drive end, drive out the two dowel pins and <br />remove all capscrews holding headplate to <br />cylinder. By inserting jacking screws into the two <br />threaded flange holed, and turning them in evenly, <br />the headplate will be separated from the cylinder. <br />As the headplate comes off the shafts it will bring <br />bearings with it. 2-1/2" and 3-1/2" gear diameter <br />units do not have tapped holes for jack screws in <br />the drive end headplates. Remove dowel pins and <br />all capscrews holding headplate to cylinder and <br />foot on the drive end. Support unit under gear end <br />cylinder flange with the shafts vertical. Using soft <br />metal block against gear end shafts, push them <br />out of gear end headplate. <br />bar with recessed end that will bear on the outer <br />metal edge of seal enclosure. Seal lip should <br />point toward the driving tool. Seals to be flush <br />without board bore face. Apply a light coat of oil or <br />grease to the seal lips. In a similar fashion, install <br />lip seals into the drive end headplate. <br />Place cylinder on a flat surface. Assemble gear <br />end headplate to cylinder after checking flange <br />punch marks. Drive in the two locating dowel pins <br />before tightening flange screws. Also install gear <br />end foot using the same longer cap screws (32) <br />and washers (41). (On 6" & 7" UNIVERSAL RAI® <br />blower install both gear end feet.) <br />9. Place the assembly horizontally on steel blocks <br />with gear end headplate on bottom. The height <br />of the blocks should be sufficient to clear gear <br />end shaft extensions. Assemble impellers into <br />the cylinder with the drive shaft (longer shaft) <br />in same location as in original assembly. Before <br />starting the shafts through the headplate holes, <br />make sure shaft ends have no sharp or rough <br />edges to damage seal lips. Position impellers at <br />900 to each other in the cylinder, using lobe -and - <br />waist match marks if original impellers are being <br />re -installed. Install drive end headplate and feet in <br />same manner as gear end. <br />10. <br />4. For 2-1/2" and 3-1/2" gear diameter units, support <br />the drive end headplate on the underside, and <br />using soft metal block against drive end shafts, <br />push them out of drive end headplate. 11 <br />For 4", 6" & T' gear diameter units, from the gear <br />end, using a wood or soft metal block against the <br />ends of the shafts, drive them out of the head <br />plate. If they are to be reused, protect them from 12 <br />damage in this operation. <br />5. If blower interior surfaces need cleaning, it may be <br />advisable to separate the gear end headplate from <br />the cylinder. Use the same general procedure as <br />employed at the drive end. <br />6. Working from the back (flat) face of each head <br />plate, push or tap out the bearings and seals. Use <br />a round bar or tube that will pass through the shaft 13 <br />clearance holes in the headplates. All lip seals will <br />be damaged during removal and must be <br />replaced. <br />7. Clean bearing and seal pockets in headplates and <br />remove burrs or rough edges. (Apply a thin coating <br />of sealant on seal O.D.) Press new seals (27) into <br />gear end headplate using a round tube or <br />It is recommended that new bearings be used for <br />rebuild. Apply thin film of machine oil on the shaft <br />bearing fit, bearing I.D., and headplate bearing <br />bore. Install drive end bearings into headplate. <br />Use a tube with flanged end that will contact both <br />bearing faces simultaneously. Refer to Assembly <br />Drawing for proper bearing depths. <br />NOTE: _-ylindri: al dril e earing s._oJd Ee <br />installed wig inner ra-e large sCoLlder <br />fa ling or-oard. <br />Place blower on its feet on a flat surface. <br />Loosen feet capscrews (32) and square up unit. <br />Re -tighten capscrews (32). Clamp unit down to <br />a solid base for further assembly. <br />Oil the gear end bearing fits as described <br />previously. Install 2-1/2" thru 5" blower gear end <br />bearings flush with the headplate bearing <br />shoulders using proper drivers. On 6" & 7" <br />gear diameter units, install thrust washer <br />(29) in bearing bores then install gear end <br />bearings so they protrude 1/16" (1.6mm) above <br />headplate surface. <br />Install bearing clamp plates (34). On 6" & 7" <br />gear diameter units, blower impeller end <br />clearances are also to be set during this step. <br />Install clamp plates (34) with capscrews (31) <br />making sure that the gap between the clamp plates <br />and the headplate is even all around. At the same <br />time, set end clearances per Table 5. <br />14. Install gears and time impellers as in (A). <br />For your nearest ROOTS Office, dial our Customer Service Hot Line 1 877 363 ROOTS (7668). 12 <br />