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plates to the headplate with capscrews (32) and <br />lock washers (35). <br />Installation of gear end bearings (14) —Turn the <br />blower so that the gear end headplates is up. Heat <br />bearing inner race to 300°F (149°C) in an oven or <br />hot oil; then slide it onto the shaft so that the <br />bearing shoulder is snugly against the sleeve. <br />Insert the bearing outer race and rollers in each <br />bore and tap lightly into place. <br />9. Measure and record the end clearance between <br />the impellers and gear end headplate, then sub- <br />tract the allowed average gear end clearance. See <br />Table 6. The result is the space required between <br />clamping plate (54) and bearing outer race. Place <br />shims (10) as required to get this clearance. Then <br />fasten the clamping plates (54) to the headplate <br />using capscrews (32) and lock washers (35). Do <br />not install wavy -spring washers (29) at this time, <br />as a final check of clearances is required first. <br />10. Final check of end clearances and float — Using <br />long feeler gauges, check the clearance between <br />the impellers and drive end headplate. See Table <br />6. Place the blower assembly on its feet and <br />correct shimming as required. Then, force the <br />impellers as close to the gear end headplate as <br />possible, and check the clearance between <br />impellers and gear end headplate for agreement <br />with Table 6. Adjust shimming on the gear end as <br />required. With unit securely fastened down, use a <br />dial indicator to measure the impeller float. Again <br />push the impeller to one end of the cylinder. With <br />indicator firmly mounted, place contact point on the <br />end of the shaft just pushed and set dial on zero. <br />Force the impeller to the opposite end (toward <br />indicator). Indicator reading will be a measurement <br />of the impeller float. Repeat process on second <br />impeller and compare float to Table 6. Adjust <br />shimming at bearing clamp plates to obtain both <br />float and end clearances specified in Table 6. <br />Finally, after clearances and float have been <br />corrected and checked, remove the gear end <br />clamping places (54) and install wavy -spring <br />washers (29) and reinstall shims (10) and clamping <br />plates (54). Be sure oil feed grooves are up and <br />toward bearings. <br />11. Installing drive gear (4) — Be sure shafts and gear <br />bores are clean and free of scratches. Oil gear nut <br />threads lightly. Place hardwood wedges as shown <br />in Figure 8. Install gear (4) and nut (31) so match <br />mark at the tooth is at the line of engagement. <br />Tighten the drive gear to the torque given below. <br />Blower assembly must be fastened down for <br />torquing operation. <br />12. Left side discharge machine <br />Installing driven gear (14) — Insert a long metal <br />feeler gauge between the impellers' lobes at the <br />fronts as shown in Table 6. Feeler gauge thickness <br />to be a middle value from Table 6 for fronts. <br />17 <br />13. Right side discharge machine <br />Installing driven gear (4) — Insert a long metal <br />feeler gauge between the impellers' lobes at the <br />backs. Feeler gauge thickness to be minimum <br />value from Table 6 for backs. <br />RAM" SERIES BLOWER GEAR NUT TORQUE <br />Frame Size <br />Torque <br />404, 406, 409, 412, 418 <br />Ib. -ft. (kg -m) <br />400 (56) <br />616,624 <br />630 (88) <br />RAM" SERIES BLOWER OIL SLINGER SCREW TORQUE <br />Frame Size <br />Torque <br />404, 406, 409, 412, 418 <br />lb. -ft. k -m <br />75 (10 <br />616,624 <br />140 (19) <br />Align the gear so the tooth match marks agree with <br />the drive gear, then install slinger (46) and nuts (31). <br />Tighten lightly with a small wrench, then check front <br />and back clearances against Table 6 for each 450 <br />position. Both fronts should be about the same and <br />backs should about equal and be within the specified <br />range in Table 6. Adjust gear position if necessary, then <br />insert the corrected feeler gauge and wedges and use <br />a torque wrench to tighten the gear nut to the torque <br />specified above. Remove wedges and rotate the drive <br />shaft by hand to make sure there are no gear tight <br />spots or impeller contacts. CAUTION: Keep <br />fingers away from impeller end gears. <br />Install gearbox (3) with gasket (7) and tighten the <br />capscrews (75) evenly to 10 ft.-Ibs. (1.3 kg -m). <br />Install drive end oil slinger (40) and capscrew <br />(60), apply Locktite to threads and torque to value <br />specified above. <br />Install drive end cover (5) and gasket (7) with drive lock <br />pins (17) in place, being careful not to dent or scratch <br />drive shaft lip seal surface. Tighten capscrews (75) <br />evenly. Check seal bore for concentricity with shaft <br />using an indicator; reposition drive lock pins, if neces- <br />sary. Install seal (33) with lip facing inward, using care <br />to avoid tearing or scratching seal on shaft keyway. Use <br />a pressing tool with clean, square ends to insure cor- <br />rect positioning of the seal. For hydrodynamic style <br />seals, the shaft rotation is critical for correct installation <br />and proper sealing. Match the directional arrow shown <br />on the seal faces with the required shaft rotation. An <br />installation protective sleeve is required to protect seal <br />lip during installation. <br />Install vent plug (21) in each headplate <br />Replace oil drain plugs (22) and refill drive end and <br />gear sumps with proper grade of oil as discussed <br />under LUBRICATION. <br />Install drive sheave or coupling half and install blower, <br />refer to INSTALLATION instructions. <br />©2002 Dresser, Inc all rights reserved <br />ROOTS, RAM, URAI and MISPAIR are trademarks of Dresser, Inc. <br />nromnow nFl inn and 1 Ini—r-1 RAI — rAnietaro trPHPmPrk< of nrp—r i— <br />