BEARING CAP ROD BOLT

NOTE: The gear is press fit to the shaft and will require a puller to remove it. 20. Remove the inner seal retainer and oil seal from the shaft. Remove the oil seal from the retainer. 21. After all first and second reduction shafts have been removed, the drum assemblies (figure 10) can be removed as follows. Because of the weight of the drum assemblies, they cannot be removed as complete assemblies. a. Have an electrician disconnect and tag the power lines to the rotary limit switch and selsyn generator. b. If so equipped, remove lube lines to bearing caps. c. Uncouple and remove the rotary limit switch and selsyn generator. d. Remove the bolts securing the shaft end covers. Remove the end covers and gaskets. e. Remove the bolts securing the inner labyrinth seals and slide them toward the drum. NOTE: The right and left drum gears will be removed first. Steps f through n cover the removal procedure for the left gear. Repeat steps {through n for the removal of the right gear. f. Rotate the drum gear until the splice bolts are in a horizontal plane. Securely block the drum and gear. g. Remove all the drum-to-gear bolts, except six equally spaced, three on each gear half. h. Secure the 25-ton overhead crane to the upper gear half. Remove the eight gear splice bolts and three gear-to-drum bolts from the upper half of the gear. Remove the upper gear half. /\.. CAUTION: The remaining steps to re.. move the other half of the gear must be done with extreme care as the drum assembly will be severely unbalanced.

1. Attach the 25-ton hook of the overhead crane to the remaining gear half. Attach the 5-ton hook to the drum by means of a rod slipped in between rope lugs. The 25ton hook will be used to rotate the gear half and the 5-ton hook will be used to restrain the drum.

j. Slowly take up on the 25-ton hoist and slack off on the 5-ton hoist. Only lift the gear two or three feet at a time. Securely block the gear and reposition the weight ofll. the gear. k. When the gear has been rotated 90°, securely block the drum gear half. A heavy beam welded between the drum rope lugs and machinery deck is recommended. 1. Reposition the hooks so that the gear can be rotated the final 90° to the horizontal position. /\.. CAUTION: The drum is highly unsta.. ble now so be extremely careful and go slowly. m. Take up the 25-ton hoist and release the welded beam from the drum. Note that any time the raising procedure is stopped, the gear and drum must be secured. n. When the gear has been rotated until the splIce is horizontal, securely block and chock the drum and gear. Reposition the 25-ton hoist, remove the remaining drum to gear bolts and remove the gear. o. Remove the bearing cap from left end of .) the drum assembly. Crib securely' under ' the drums. Attach the 25-ton hook to the spider on the gear side of the drum assembly and remove the spider to drum bolts. p. Shift the spider outward to clear the drum shoulder fit and remove the spider. A jack or a come-along will be required to disengage the spider from the drum. NOTE: A block and tackle can be attached to the bottom of the spider to hold it vertical as it is lifted clear of the drum. q. When the spider is completely removed, the bearing can be removed from the spider. Remove the bearing retainer. Attach hydraulic lines in the end of the spider stub shaft and apply 10,000 PSI pressure with a grease gun with No.2 grease while applying pressure with a bearing puller. r. Secure the 25-ton hoist to the drum half on the left side. Air-arc out the weld between the drum halves. Be sure to follow all safety precautions. When the weld has been removed, remove the bolts and dowel pin from the center flange. Use jacks l .' .; between the rope anchor blocks to separate the drum halves.