Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE piston rod and remove. 6. As the piston leaves the cylinder, be careful in handling the piston rings. Despite their toughness in service, rings are fragile with regard to removal. Always handle them with clean tools and hands, and protect the rings from nicks, marring, and bending. Move the piston out of the cylinder until a fraction of the first ring clears the cylinder. Encircle the ring by hand (use a band for larger sizes) until it is clear and remove it. Use this same procedure to remove the succeeding rings and wear band. 7. Slide the piston rod out of the packing case and crank end head. The threaded crosshead end of the rod is 1/4 inches (6 mm) smaller in diameter than the inside diameter of the packing. Using extreme care, slowly slide the piston rod through the packing so as not to damage the rod threads or the packing rings. Piston and Rod - Disassembly and Reassembly Piston and Rod - Disassembly Clean the threaded hole in the end of the piston rod to remove any residue, corrosion, etc. that may be present. Remove the piston nut set screws (2). Use the separately purchased Hydraulic Piston Nut Torquing Tool and appropriate hand pump (reference Figure 5-26 on Page 5-39 and the instructions in “Reassembly” below for detailed information to apply the tool) to disassemble piston and rod. ! Piston and Rod - Reassembly CAUTION TRAPPED GAS PRESSURE IN HOLLOW PISTONS CAN PRESENT A PERSONAL SAFETY HAZARD WHEN SERVICING THE PISTON AND ROD ASSEMBLY. WORK IN A WELL VENTILATED, NON SPARKING AREA. DO NOT BREATHE GAS EMIT- TED FROM PISTONS WHEN VENTING TRAPPED GAS. 1. Clean all piston and rod assembly parts thoroughly. Be sure piston is internally clean and dry. 2. Inspect parts for nicks, burrs or scratches and dress surfaces with a fine grit stone as required. 3. Inspect the piston rod threads and collar shoulder. Threads are to be clean and free of burrs. Fit the collar and nut into the piston to verify the outside diameter fits and it rotates freely. Install the collar and nut onto the piston rod to verify that the inside diameter fits and it rotates freely. Run the piston nut down by hand until the rod threads protrude to verify freedom of thread engagement. Remove nut and collar. 4. Check piston rings and wear band to determine wear (see “Determining Ring Wear:” on Page 5-42 and “Determining Wear Band Wear:” on Page 5-42). Replace piston rings and wear bands as required. 5. Apply a thin coating of “Never-Seez”, Regular Grade to the piston rod shoulder 7/09 PAGE 5 - 37
FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE and rod collar locating bands, and collar face in contact with the piston, then slide collar onto rod. 6. Apply a thin coating of “Never-Seez”, Regular Grade to piston rod threads at the piston end, then slide piston in place onto rod and collar. For two-piece pistons, install a new o-ring between the piston halves. NOTE: ONE END OF SINGLE PIECE PISTONS IS MACHINED 0.002 INCHES (0.05 mm) UNDERSIZE ACROSS A 3/4 INCH (20 mm) WIDE BAND FOR MANUFACTUR- ING PURPOSES. IF THE PISTON IS SYMMETRICAL AND CAN BE INSTALLED IN EITHER DIRECTION, ASSEMBLE WITH THE UNDERSIZE BAND TOWARD THE HEAD END. 7. Apply a thin coating of “Never-Seez”, Regular Grade to the piston nut threads and piston mating face. Install nut and hand tighten. 8. Put the separately purchased torquing tool in place, with the two dowel drive pins placed into the holes in the piston rod nut (see Figure 5-26 on Page 5-39). Turn the tool-puller-bolt into the threaded hole in the end for the piston rod. Tighten the puller-bolt by hand until torquing tool is tight against the piston rod assembly. CAUTION! TIGHTEN A MINIMUM OF 14 TURNS TO PREVENT PISTON ROD TO PULLER-BOLT THREAD FAILURE. SUCH FAILURES CAN RESULT IN PER- SONAL INJURY. TOOL MUST BE PROPERLY CONFIGURED. 9. Then back off the tool puller-bolt 1/4 turn. Note that the puller-bolt is provided with a hex drive, to assist in tightening or loosening the puller-bolt, if necessary. A hydraulic pressure of 8,700 psig (600 barg ) is to be applied to the torquing tool to stretch the piston rod. A separately purchased hand pump is recommended. Then 30 lb-ft (41 N·m) of torque is to be applied to the 5/8 inch hex pinion gear drive. The hydraulic pressure is then released. Re-apply hydraulic pressure and completely loosen piston nut without disassembling and release hydraulic pressure; repeat the tensioning/tightening procedure. Repeating the procedure to be sure that the components are seated properly. The G-12644 torquing tool is also used and pressurized to disassemble a piston and rod. ! CAUTION DO NOT OVERPRESSURE THE HYDRAULIC TORQUING TOOL. OVERPRESSURE CAN CAUSE THE TORQUING TOOL TO FAIL AND/OR RESULT IN EXCESSIVE PRE-LOAD OF THE PISTON ROD. PISTON ROD FAILURE CAN OCCUR DUE TO EXCESSIVE PRE-LOAD. SUCH FAILURES CAN RESULT IN PERSONAL INJURY. PAGE 5 - 38 7/09
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Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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