Sheet 2300-10, Page 3
20. Reassemble blower (See pages 4 and 5) 21. Remove drain plugs and run blower until grease stops flowing from openings. JACKSHAFT BEARINGS (solid pillow block type). 1. If belt driven, remove belts and jackshaft sheave. (See Section D) 2. If coupled drive, disassemble coupling. Remove jckshaft half of coupling after removal from base. (Section C) 3. Disassemble blower. (See pages 4 and 5) 4. Unbolt pillow blocks. Remove shaft and pillow blocks from base. 5. If coupled drive, remove half coupling from shaft. 6. Loosen set screws in bearing retainer rings and slip bearing and pillow blocks from shaft. 7. Clean shaft. Remove burrs and rough spots. 8. Oil shaft and base of new bearings. Slip bearings and pillow blocks onto shaft. Do not tighten set screws. (If pressure is required, use wood or brass against inner sleeve only. Do not press on outer race or pillow block.) 9. If coupled drive, replace half coupling on shaft. 10. Put shaft and pillow blocks on base and bolt lightly. 11. Align shaft as in step 9 of Section J. 12. Tighten pillow blocks to base taking reasonable care that they are square with shaft. The bearings are self- aligning and will compensate for a reasonable amount of misalignment. Drill and pin blocks to base. 13. Tighten retainer ring set screws firmly onto shaft. 14. Reassemble blower. (See pages 4 and 5.) 15. Start blower and immediately grease with hand gun until fresh grease flows out around seal on both sides of bearing, or through relief hole in grease fitting. Excess grease will flow out as bearing warms up.
JACKSHAFT BEARINGS (solid pillow block type). Grease with hand gun while blower is operating until old grease is eliminated and new, clean grease flows around seal on both sides of bearing or through relief hole in grease fitting. Excess grease will flow out as bearing heats.
H. Replacement of Bearings. Preparation of new bearings.
1. Wash thoroughly with petroleum solvent or kerosene. 2. Place new bearings in a bath of Sohio So Hi Vis J 156, or equivalent, at a temperature not exceeding 250 F. (The oil must not burn or break down at this temperature.) Support the bearings near the center of the bath on a screen to prevent uneven heating. Sixty minutes or more in the bath will expand bearing evenly for easy installation. A thermostatically controlled French Fryer can be used (check temperature with a thermometer). 3. Do not heat bearings with flame or on a hot metal surface 4. Do not press or drive bearings onto shaft. MOTOR BEARINGS. Follow motor manufacturer's instructions although the basic principles discussed here will apply. JACKSHAFT BEARINGS (split pillow block type). 1. If belt driven, remove belts and jackshaft sheave. (See Section D, pages 1 and 2) 2. If coupled drive, disassemble coupling. Remove jackshaft half of coupling after jackshaft is removed. (See Section C, page 1) 3. Disassemble blower. (See pages 4 and 5) 4. Remove bearing caps, marking them for return to same pillow blocks. 5. Lift out shaft. 6. Remove coupling from shaft. 7. Press off old bearings, taking care not to damage shaft. Remove snap rings fi rst . 8. Make note of relative position of rings, seals, etc. 9. Wash all parts thoroughly, including any new rings or seals supplied. Be sure shaft has no burrs or rough spots. 10. Slip any rings or seals and new heated bearings into place in proper order. 11. Be sure the new bearing is held in its proper position as it cools and tightens on shaft. 12. If coupled drive, replace half coupling on shaft. 13. Place shaft and bearings into pillow blocks with all parts in their proper places. 14. Rotate shaft, rings, etc., by hand to be sure all are free. 15. Pack bearings between races with new grease. 16. Fill pillow blocks 1⁄3 to ½ full of grease. 17. Replace bearing caps in original location. 18. Be sure shaft turns freely by hand. 19a. Replace jackshaft sheave and belts (V-belt model). (See Section D) Or 19b. Clean, reassemble, and grease coupling (coupled drive model). (See Section C)
C
MOUNTING PADS FOR CASE
D
BASE
B
A
SQUARE STRAIGHT EDGE
Figure 2. Plan view (looking down) showing positioning of pillow blocks when inner case has been removed.
J. Replacement of Pillow Blocks (split type). 1. Prepare and heat new bearings as in Section H. 2. Disassemble jackshaft bearings as in Section H, steps 1 through 7 for split type. 3. Assemble new bearings on shaft as in Section H, steps 8 through 11 for split type.
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