Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE ring set individually onto the rod and check the total end gap. See “Types of Piston Rod Packing Rings” on Page 5-46 for end gap tolerances. If not within tolerance, replace with a new ring or file at a gap to restore total end gap to within tolerance. With the ring set on the rod, shine a light from behind the ring, if any light is observed between the ring and the rod, the ring set is not acceptable. 6. Make sure that each rod ring and cup is properly positioned and, unless nonlube, that rings are lightly coated with new clean lubricant before reassembly. Only use the same lubricant that is used in the force feed lube system. If nonlube, see “Cleaning, Handling and Thread Lubricants for Non-Lubricated Compressor Cylinders” on Page 5-66. Make sure the tie studs are completely screwed into the end cup. Examine all parts for unusual nicks or burrs which might interfere with the free floating of the rod ring in the cups. Particular care should be taken with rod rings made of soft materials, such as bronze or TFE, and it is extremely important that wiper rings be handled and installed so as to prevent damage to the scraping edges. If packing case is “water”-cooled, see “Water-Cooled Piston Rod Packing” on Page 5-54. Plastic Quill must be in Place (Ariel P/N A-12801) High-Pressure Plastic Quill Oil- Drip Lube Cup (Pre-2006) Lube Cup Identification Axial Groove (Beginning 2006) Grooved Oil- Drip Lube Cup (Beginning 2006) 1/4 in. (6 mm) FIGURE 5-30 PISTON ROD PACKING CASE LUBE CUPS 7. Parts should be laid out on a work bench so that they can be installed progressively with each in its correct position and the rod rings with their proper faces toward the pressure. Note that all rod ring segments are carefully lettered and must be assembled accordingly. This is most important in order to be sure of proper sealing. Install new tie stud nuts and tighten to the values given in Table 1-11 on Page 1-18. Make sure that all rings move freely, radially, in their grooves using your fingers. Side loaded WAT and AL rings will be snug and should be centered in the case when being installed, prior to tightening tie stud nuts. Side loaded rings should still move in the assembled case, using your fingers. Be sure these rings are centered. 8. For new installations, care must be given to the cleaning of all accumulated dirt in the lines and compressor because foreign material will lodge in the packing to become destructively abrasive. 9. Prior to installing the packing case into the cylinder, be sure gasket surfaces in the packing counter bore on the crank end of the cylinder are clean and not scratched. Install a new spiral wound gasket. Hold the gasket in the groove with super glue or grease when installing the packing case. If for non-lube service, only use the glue. 7/09 PAGE 5 - 45

FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE 10. Reinstall the complete packing case assembly with the oil supply point on top. Using the rod packing cap screws, pull the packing into place but do not tighten yet. 11. Reinstall the oil wiper gland(s) in the crosshead with the oil wiper packing. 12. Reinstall the piston and rod. Follow the steps under “Piston and Rod - Installation” on Page 5-40. 13. After the crosshead nut has been tightened, tighten the rod packing cap screws evenly to the recommended torque in Table 1-11 on Page 1-18 to be sure that the pressure packing comes up square on its nose gasket. Alignment is readily accomplished by the use of feelers to maintain a uniform clearance all around between the case bore and the rod. Rod packing cap screw tightening on high pressure cylinders requires the use of a torque multiplier. NOTE: THE FINAL TORQUE FOR THE ROD PACKING CAP SCREWS SHOULD BE REPEATED UNTIL NO TURNING OF THE FASTENERS IS OBSERVED. THE TORQUE ON THESE FASTENERS SHOULD BE RE-CHECKED AT THE NEXT SERVICE INTERVAL. 14. Retighten the small tie stud nuts. Reinstall the tubing connections and instruments (if applicable). Take care not to cross-thread the tubing nuts. Tubing nuts must be tight. NOTE: AFTER REINSTALLING THE PRESSURE PACKING, REFER TO “Force Feed Lubrication System” ON PAGE 4-49 FOR INSTRUCTIONS FOR PRIMING THE FORCE FEED LUBE SYSTEM. PRIMING SHOULD BE REPEATED EACH TIME A COMPRESSOR IS STARTED BECAUSE OIL LINES MAY HAVE BEEN BLED DURING DOWN TIME. FOLLOW INSTRUCTIONS IN “Force Feed Lubricator Adjustment” ON PAGE 3-14 FOR LUBRICATION RATES THAT ARE RECOM- MENDED FOR BREAK-IN OF A NEW MACHINE. BREAK-IN LUBE RATES ARE APPROXIMATELY TWICE THE NORMAL RATES - OR ONE-HALF THE NOR- MAL INDICATOR PIN CYCLE TIME. Types of Piston Rod Packing Rings Type "P" Pressure Breaker This is a single ring. It is cut radially into three equal segments. This ring breaks down or slows the gas flow without sealing it completely. See Figure 5-31. Letters toward pressure/cylinder Total End Gap - Installed: 0.058 to 0.064” (1.5 / to 1.7 mm) for PEEK 0.029 to 0.035” (0.7 to 0.9 mm) for Bronze & Cast Iron End gap should be maintained by replacing the ring. Radial Cut FIGURE 5-31 TYPE “P” PRESSURE BREAKER PAGE 5 - 46 7/09

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