Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE Crosshead Crosshead - Removal CAUTION BEFORE REMOVING A CYLINDER HEAD OR VVCP, BACK OFF ALL CAP SCREWS 1/8 INCH (3mm). MAKE SURE THAT THE HEAD OR VVCP IS LOOSE AND THE CYLINDER IS VENTED. SEE IMPORTANT SAFETY INFORMATION PLATES ON UNIT TOP COVER, (REFERENCE FIGURE 1-2 ON PAGE 1-6 FOR LOCATION.) CAUTION CROSSHEADS ARE HEAVY. CARE MUST BE TAKEN WHEN HANDLING TO AVOID PERSONAL INJURY. THE WEIGHT OF EACH CROSSHEAD IS LISTED IN THE BAL- ANCE SHEET THAT COMES IN THE MANUAL WITH EACH COMPRESSOR AND IS STAMPED ON EACH CROSSHEAD. Shoe Area Roll Pin End Plate Through Cap Screw ! ! Crosshead Pin Roll Pin Locknut Through Cap Screw End Plate Bushing FIGURE 5-5 CROSSHEAD COMPONENTS - TYPICAL Crosshead- Balance Nut Loosen Set Screws Before Turning Nut 1. Operate the pre-lube pump to lubricate the bearings. 2. On the throw where the crosshead is to be removed, loosen all cylinder head (head end) or VVCP bolting to the Caution above to be sure that cylinders are completely vented. 3. Remove crosshead guide side covers and gaskets. 4. Remove the cylinder head or VVCP. For non-lube cylinders, reference “Cleaning, Handling and Thread Lubricants for Non-Lubricated Compressor Cylinders” 7/09 PAGE 5 - 9
FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE on Page 5-66. In the case of tandem cylinders where the outboard cylinder bore is smaller than the inboard bore, it is necessary to remove the outboard cylinder. Support such cylinders during removal and installation, as to not put excessive weight on the piston and rod assembly which might cause bending. 5. Manually rotate the crankshaft to position the throw with the crosshead to near the inner dead center position. Back off, but do not remove the crosshead-balance nut set-screws. 6. Check crosshead guide to frame, guide support and support to skid bolting torques to be sure all are properly tightened (refer to Table 1-11 on Page 1-18), prior to loosening crosshead-balance nut. 7. Loosen the crosshead-balance nut with the separately purchased hydraulic crosshead-balance nut torquing tool and hand pump, see Figure 5-10 on Page 5-16 and “<strong>Ariel</strong> Tools - Separately Purchased” on Page 7-4. This tool is required to loosen/tighten the crosshead-balance nut. Loosen the nut with the hydraulic crosshead-balance nut torque tool properly configured and positioned in the right hand crosshead guide window when looking at compressor frame standing at cylinder for pushing against the bottom of the window. a. Bolt the spanner wrench adapter to the crosshead-balance nut using the three special shoulder bolts, with the open area toward the spanner wrench. If the open ends overlap the spanner wrench can be sprung. Refer to page 5-12 and Figure 5-10 on Page 5-16. b. Apply a hydraulic pressure to the hydraulic cylinder until it fully extends. c. Release the hydraulic pressure and re-set the cylinder in the spanner wrench next notch and/or reposition the spanner wrench on the adapter splines if nut is not loosened. 8. Repeat the steps b. and c. to a hydraulic pressure of 2200 psig (207 bar g ) maximum to the hydraulic cylinder to loosen the crosshead-balance nut. If during loosening, the spanner wrench adapter open area turns 90 degrees before crosshead-balance nut is loose, remove the spanner wrench. Remove the bolting and the spanner wrench adapter from the crosshead-balance nut. Reposition the spanner wrench adapter so the open area again faces the right hand guide window. CAUTION: DO NOT ALLOW THE OPEN AREAS OF THE SPANNER WRENCH AND THE ADAPTER TO OVERLAP AS THE SPANNER WRENCH CAN BE SPRUNG. IF THE SPANNER WRENCH BECOMES SPRUNG, DESTROY IT AND REPLACE IT. 9. Remove the hydraulic crosshead-balance nut torquing tool. 10. Manually rotate the crankshaft to move the crosshead to near the outer dead center position. 11. Turn the crosshead-balance nut off of the piston rod, while removing the piston and rod assembly. See “Piston and Rod - Removal” on Page 5-36. 12. Remove the crosshead pin through cap screw, lock nut, end-plates and pin. Discard the old lock nut. 13. Manually rotate the crankshaft to near the inner dead center throw position. Make sure the connecting rod does not drop and damage the crosshead guide surface. PAGE 5 - 10 7/09
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Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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