Sheet 2300-10 Page 4
21. Reassemble blower. (See pages 4 and 5) 22. Remove drain plugs from pillow blocks and operate blower until grease stops flowing from holes. Replace plugs.
4. Remove old pillow blocks. Make note of location of each shim and spacer. This will simplify alignment of new blocks. 5. Bolt new pillow blocks on base loosely. 6. Place the shaft and bearings in the pillow blocks with all parts in their proper places. Do not grease yet. 7. Put the bearing caps in place and tighten lightly. 8. Set pillow blocks so that shaft is as close to original position as possible with all shims and spacers in original positions. Lightly tighten block "C", nearest the motor. (Fig. 2)
PIN
BOLT
SEAL RINGS SHOULD TURN FREELY
BOLT
C
PIN
CASE
Figure 5 . Plan view looking down on pillow block.
D
DISASSEMBLY OF BLOWER 1. Remove intake guard. 2. Remove case flange bolts and nuts. 3. Remove outer case being careful not to bump impeller. (Felt seal should come off with outer case.) 4. Loosen impeller hub screws. Apply penetrating oil to shaft and clean before trying to remove impeller. Caution : Impellers are accurately balanced and should be handled with care. Grasp impellers by hub only. Larger sizes have provisions to attach wheel pullers. 5. On multi-stage blowers, drive out case flange pins from motor side to remove stationary vane, supporting vane so that it dœs not drop on impeller or shaft. (Felt seal should come off with stationary vane. Pins should remain in stationary vane.) 6. Remove impeller as in step 4 above. 7. Repeat step 5 and step 6 if more than two stages. 8.If necessary to remove inner case, make note of location of each shim and spacer. 9. Remove motor if required. ASSEMBLY OF BLOWER CASES 1. Mount inner case to base. (Return all shims and spacers to original positions.) 2. Mount shaft to base. Do not tighten. 3. Slip impeller on shaft (push lightly against inner case). Line up motor, or if necessary, shim inner case so that top, bottom, and both sides are within 1⁄32 inches of case. Impeller warpage, if any, should be allowed for. 4. Tighten bolts positioning shaft. 5. If single stage blower, bolt on outer case, set impeller ½ way between inner and outer cases (not more than 3⁄16 inch from outer case) and tighten hub screws firmly. If impeller is warped, judgment should be used as to spacing. 6. If multi-stage blower, set impeller 1⁄8 inch from inner case and tighten hub screws firmly. 7. Mount stationary vane with flange pins and drive them firmly into inner case.
B
A
IMPELLER
Figure 3 . Plan view (looking down) showing positioning of pillow blocks with inner case in place. 9. Using a square and straight edge, locate the blower end of the shaft as shown in Fig. 2, or Fig. 3 if inner case was not removed, with "A" equalling "B" ± 1⁄32 ". 10. Remove bearing caps.
STRAIGHT EDGE
A
D
C
B
SHAFT
Figure 4. Side (elevation) view showing how pillow blocks must be aligned to touch at A, B, C, and D. 11. Place straight edge parallel to shaft on machined face of pillow blocks, as shown in Fig. 4, and check clearance with feeler gauge. All points "A", "B", "C", and "D" must be within 0.002" of touching. If not, install shims as required. Repeat on other side of shaft. 12. Turn seal rings by hand. (See Fig. 5). If all parts do not turn freely, move one end of pillow block until freedom of movement is achieved. Repeat at other pillow block. 13. When all conditions are satisfactory, tighten bolts permanently and recheck alignment. 14. Drill and pin blocks to prevent movement. Select points other than where old pins were. 15. Be sure all parts are still clean. 16. Pack bearing between races with new grease. 17. Fill pillow blocks 1⁄3 to ½ full with grease. 18. Replace bearing caps. 19. Be sure shaft turns freely by hand. 20a. Replace jackshaft pulley and belts. Align belts (Section D) Or 20b. Realign, reassemble, and grease coupling. (Sections C and G)
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