Heavy Duty Balanced Opposed Compressors

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FOR MODELS: JG AND JGA SECTION 5 - MAINTENANCE Oil Slinger Drive End FIGURE 5-4: CRANKSHAFT WITH SLINGER AND SPROCKET - TYPICAL Crankshaft - Removal Main Bearing Journals Crank Pins Counterweights Sprocket 1. Remove the coupling shim pack. Remove the coupling hub. (In order to remove the coupling hub it may be necessary to heat it. Use insulated gloves to protect hands.) If the coupling hub is not removed, the drive end cover cannot be removed and will need to be lifted out with the crankshaft. 2. Remove the top cover, spacer bars and drive end cover (if the coupling hub has been removed). Tip: If the spacer bar bolts are difficult to remove, use a 12 point hammer wrench. 3. Be careful not to damage the sharp corners on each end of the top of the crankcase. These corners form the junction between the end covers, top cover, and base; thus they must be kept sharp and unmarred to prevent oil leaks. 4. Detach the connecting rods. (See “Connecting Rod - Removal” on page 5-2.) Move the rods to their full outer position. 5. Remove the capscrews on the chain adjustment cap. Turn the cap to loosen the chain. Slip the chain off the crankshaft sprocket. 6. Remove the capscrews from the bearing caps. Pull the caps straight up to prevent damage to the dowel fit. If the cap is tight, use a Bearing Cap Puller as illustrated in Figure 5-5: PAGE 5 - 8 11/01
FOR MODELS: JG AND JGA SECTION 5 - MAINTENANCE 6” to 10” (15 to 25 cm) Long 1/2-13 UNC Threaded Rod 1/2 -13 UNC Lock Nut Crankshaft 1/2-13 UNC (Jack Nut) Turn this Nut to Jack Bearing Cap straight up. Drill an 5/8” (15 mm) Hole FIGURE 5-5: BEARING CAP PULLER 13 to 16” (33 t0 40 cm) Long Steel Bar 1/3-13 UNC Puller Hole 7. Before removing the crankshaft from the crankcase, wooden saddles or a notched wooden crate with sides high enough to prevent the webs or oil slinger from touching bottom should be prepared in order to store the crankshaft during maintenance - even though it may be out for only a short time. In addition, the crankshaft should be adequately protected from above so that dropped tools or equipment cannot mar the surface of pins and journals. 8. Turn the crankshaft so that sling lifting point(s) are above the center of gravity of the shaft, so that it does not want to rotate when lifted. Lift straight up with the ends of the crankshaft parallel to the frame. Two persons will be needed to safely remove the crankshaft as well as a crane or lift due to the weight of the crankshaft. Appropriately sized nylon slings should be used during this operation to avoid marring of the running surface of the crankshaft. Great care must be taken during this operation since the shaft could bind and become damaged. NOTE: THE LOWER HALF BEARING SHELLS SOMETIMES HAVE A TENDENCY TO STICK TO THE SHAFT JOURNALS BECAUSE OF THE CLOSE FITTING OILY SURFACES OF THE TWO PARTS. THEREFORE, WHEN THE SHAFT HAS BEEN LIFTED CLEAR OF THE SADDLES, APPROXIMATELY 1/4 INCHES OR 6 mm, CHECK TO MAKE SURE THAT THE LOWER HALF BEARING SHELLS HAVE NOT COME OUT WITH THE SHAFT. IF SO, THE BEARING SHELLS SHOULD BE TAPPED BACK ONTO THE SADDLES BEFORE LIFTING THE SHAFT ANY FURTHER. 9. While one person operates the crane, raising it very slowly, the second person must grasp the crankshaft at the drive end with one hand on the counterweight or one of the throws and the other hand on the end of the shaft to keep the 11/01 PAGE 5 - 9
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