Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE 8. Remove the cap screws from the main (journal) bearing caps. The separately purchased hydraulic connecting rod/main bearing-caps cap screw torquing tool and appropriate electric or pneumatic pump (see Figure 7-12 on Page 7-7), is used to loosen the cap screws. This tool reacts against the opposite diagonal cap screw head. Be sure that hydraulic tool is configured for loosening the main bearing cap screws. 9. 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 5-14 on Page 5-20. 10. Before removing the crankshaft from the crankcase, wooden saddles with sides high enough to prevent the webs or oil slinger from touching bottom should be prepared in order to hold 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. 11. Manually rotate the crankshaft so that sling lifting points are above the center of gravity of the shaft, so that it does not want to rotate when lifted. Lift straight up keeping the crankshaft bearing journals parallel to the frame. Two to three people will be needed to safely remove the crankshaft as well as a crane or lift due to the weight of the crankshaft, see Table 1-1 on Page 1-2 to approximate bare crankshaft weights. Appropriate sized nylon slings should be used during this operation so as not to mar the bearing surfaces of the crankshaft. Great care must be taken during this operation since the crankshaft could bind and become damaged. NOTE: THE LOWER BEARING HALF SHELLS SOMETIMES HAVE A TENDENCY TO STICK TO THE CRANKSHAFT 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 BEARING HALF SHELLS HAVE NOT COME OUT WITH THE CRANKSHAFT. IF SO, THE BEARING SHELLS SHOULD BE TAPPED BACK ONTO THE SADDLES BEFORE LIFTING THE CRANKSHAFT ANY FURTHER. 12. While one person operates the crane, raising it very slowly, the second (and third) person(s) must grasp the crankshaft at the drive end (or both ends) with one hand on the counterweight or one of the throws and the other hand on the end of the shaft to keep the crankshaft level. Wear gloves to avoid being cut by the slinger and to achieve a good grip. The gloves should be clean to avoid marring the running surface. As the shaft is being slowly raised, the drive and auxiliary ends should be lifted at the same rate. Care must be taken to avoid marring the crankshaft surfaces by carefully guiding the crankshaft. Crankshaft - Oil Slinger OIL SLINGER REMOVAL: Although the slinger should last indefinitely with proper care, it can become nicked (reference Figure 5-13 on Page 5-20). Should it need replacement, suspend the crankshaft on an appropriately sized, clean sling with the auxiliary end up, and heat the slinger to approximately 400°F (204°C). It will attain a yellow glow at this temperature. When it has expanded it should fall off by itself. Do not over heat. 7/09 PAGE 5 - 21
FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE CAUTION!: DO NOT TOUCH HOT SURFACES WITHOUT PROPER INSULATION TO PREVENT INJURY. OIL SLINGER INSTALLATION: Put the crankshaft in the horizontal position. Put a rod of at least 1/2 inches (13 mm) in diameter through the slinger. (Special care should be exercised when handling the slinger, not only to keep its surfaces unmarred, but to avoid being cut by the outer sharp edge.) With the slinger suspended from the rod, heat it with a small torch. When it has attained a yellow glow, approximately 400°F (204°C), it can be slipped over the drive end of the crankshaft. Do not over heat the oil slinger. Hold the slinger in position with high temperature gloves or two pieces of clean wood, rotating it slightly to make sure it is square, until it has cooled enough to shrink onto the crankshaft. CAUTION!: DO NOT TOUCH HOT SURFACES WITHOUT PROPER INSULATION TO PREVENT INJURY. Crankshaft - Chain Sprockets CHAIN SPROCKETS REMOVAL: 1. Examine the sprockets carefully for signs of wear and replace if necessary. If sprockets have been in operation for five years or more, it may be convenient to replace the sprockets when the crankshaft is removed from the frame. For 6-throw crankshafts the sprockets are mounted on an adapter that may be unbolted to change sprockets without removing the crankshaft from the frame. 2. Drill a hole in the sprocket hub to remove a sprocket. The hole should be parallel to the crankshaft centerline and big enough to remove most of the hub cross section (refer to Figure 5-15). Be careful not to drill into the crankshaft or sprocket adapter with the drill. Mark the twist drill with tape so you do not drill through the sprocket. 3. The drilled hole will relieve most of the shrink, and a couple of good radial hits with a hammer and chisel will open a sprocket enough so it can be easily removed. Hit Here with Chisel & Hammer Drill Hole in Sprocket Hub to Remove a Worn Sprocket FIGURE 5-15 CRANKSHAFT CHAIN SPROCKET - TYPICAL CHAIN SPROCKETS INSTALLATION: Encircle the oil pump drive sprocket with a wire. Suspend the sprocket from the wire and heat it with a small torch. When it has attained a yellow glow, approximately 400°F (204°C) it can be slipped over the auxiliary end of the crankshaft or adapter. Do not over heat the sprocket. Be sure that it is properly oriented before installing (refer to Figure 5-13 on Page 5- 20 and/or the Parts Assembly Drawing). Hold the sprocket in position with high temperature gloves or two pieces of clean wood, rotating it slightly to make sure it is square and tight against the shoulder, until it has cooled enough to shrink onto the crankshaft or adapter. Repeat for the force feed lubricator drive sprocket. For 6-throw crankshafts, reinstall the sprocket adapter and spacer or flywheel, if they were removed from the crankshaft. Tighten bolting to the value given in Table 1-11 on Page 1-18. CAUTION: DO NOT TOUCH HOT SURFACES WITHOUT PROPER INSULATION TO PREVENT INJURY. PAGE 5 - 22 7/09
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Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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