Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE Compressor Piston Compressor Piston Rod Collar O-ring (Two-Piece Pistons only) Piston Nut w/(2) Set Screws Dowel Drive Pins (2) FIGURE 5-26 HYDRAULIC PISTON NUT TORQUING TOOL (G-12644) 10. After tightening, the piston rod should not protrude more than 0.010 in. (0.25 mm) past the piston face. If it does, contact your packager and/or <strong>Ariel</strong>. 11. Inspect the two Allen set-screws and if damaged, replace them. Apply a thin coating of “Never-Seez”, Regular Grade, to the set screws threads and seating surfaces. Two new Allen key wrenches are required per nut at each tightening and are discarded after their one time destructive use. Install the set screws and tighten so that the Allen wrench is permanently deformed by tightening past its yield point (twisted through an additional 15° arc). A piece of heavy wall tubing or equal of a proper inside diameter to fit over the Allen wrench is required to extend the “handle” end of the wrench to achieve proper tightening. The Allen wrenches used must conform to ASME B18.3 requirements for hexagonal keys. 12. Use a 60° center punch to prickpunch the piston nut, within 1/16 in. (1.5 mm) of the set screw threads, to stake the set screws in place. Prick-punch marks should deform the nut to lock the set screws without deforming the set screw. The staked piston nut must not exhibit any cracks or torn material that might allow chips to come loose in service. See Figure 5-27. Torquing Tool (Separately Purchased) Worm Gear Tool Piston Puller-Bolt - 3/4 in. Hex to Attach or Remove Tool Piston Return Springs Hydraulic Connection - Separately Purchased Hand Pump G-12639 is Recommended 5/8 in. Hex Worm Drive for Final Torquing w/ Piston Rod Hydraulically Stretched 13. Weigh the piston rod assembly with the piston rings and wear bands included. Weigh parts on a calibrated scale to 0.1 pounds (0.05 kg). Stamp the weight on the piston’s head end. Remove any raised lips caused by stamping using a fine grit flat stone to avoid clearance measurement errors. Record this weight for 7/09 PAGE 5 - 39 Pinon Gear Piston Nut Set Screw No Cracks or Torn Material Allowed Punch Mark within 1/16 in. (1.5 mm) of Threads to Deform Piston Nut to Lock Set Screw w/o Deforming Set Screw FIGURE 5-27 STAKING COMPRESSOR PISTON NUT TO LOCK SET SCREWS
FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE future reference. Piston and Rod - Installation 1. Install the piston-rod-assembly with piston rings and wear band into the cylinder. The threaded crosshead end of the rod is 1/4 inches (6mm) smaller than the inside diameter of the packing. It is not necessary to use an entering sleeve if reasonable care is taken, but a plastic sleeve may be helpful to be sure that the packing rings are not damaged. A piston rod entering sleeve is provided in the <strong>Ariel</strong> tool box, see Figure 7-3 on Page 7-3. For longer rods, a separately purchased piston rod support can be useful, see Figure 7-10 on Page 7-6. See “Piston Rings - Installation” on Page 5-43 and “Wear Band - Installation” on Page 5-43. 2. See “Crosshead - Installation” on Page 5-12 for details to re-attach piston rod to crosshead, check piston end clearance, piston rod runout and crosshead clearances, and re-assemble to close cylinder and crosshead guide. Crosshead Crosshead- Balance Nut Piston Rod Run Out Set Screws Piston Rod Piston Piston Rod Turning Tool B-3472 Ratchet Extension Support Tool B-1240 FIGURE 5-28 PISTON AND ROD REMOVAL/INSTALLATION - TYPICAL Check piston rod run out after installing a new unit, after relocating a unit or after any maintenance that could affect rod run out. Verify that the crosshead guides are properly shimmed to level. See “Setting Crosshead Guides” on Page 2-4. Verify that the crossheads are in direct contact with the bottom of the PAGE 5 - 40 7/09
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Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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