Heavy Duty Balanced Opposed Compressors

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FOR MODELS: JG AND JGA SECTION 5 - MAINTENANCE Wear Bands 1-3/4JG-FS-HE Class pistons use one, one-piece angle cut filled Teflon wear band. Determining Wear Band Wear: Since the wear band does not work as a sealing ring, maximum end gap is not critical. The amount of wear band projection beyond the outer diameter of the piston is important. Wear band projection can be checked by measuring piston to cylinder bore clearance at the bottom of the bore. This can be done without removing the piston from the cylinder. Replace the wear band before it has worn enough to allow the piston to touch the cylinder bore. Piston Rings - Installation 1. Place the rings over the grooves in the piston. Compress the Teflon one-piece rings by hand. 2. With the rings fully compressed in the grooves, insert the rod and piston into the cylinder. Make sure the rings stay in place while inserting the piston and rod. NOTE: RING GAPS ARE TO BE STAGGERED AROUND THE PISTON, RATHER THAN IN LINE. 3. Follow the steps under “Piston and Rod - Installation” on page 5-20. Wear Band - Installation Install the wear band as if it was another piston ring as above. Piston Rod Pressure Packing - Removal 1. Remove the piston and piston rod. See “Piston and Rod - Removal” on page 5- 18. 2. Remove packing diaphragm and oil wiper packing. 3. Disconnect the lube oil tube and/or coolant connections from the top of the packing gland and the primary vent tube from the bottom of the gland. Remove the twelve point capscrews that hold the pressure packing gland to the cylinder. 4. At this point do not remove the small nuts from the studs. These studs hold the entire packing case together so it can be removed as an assembly. 5. Screw two short 3/8-16 UNC capscrews into the two tapped holes provided in the crank end face of the packing gland. A screwdriver or pry bar under the heads of the capscrews can be used to pull the entire pressure packing out into the crosshead guide. It will then come out through the side opening of the guide. The pressure packing may now be taken to a clean place for disassembly. 6. Set the pressure packing on a clean surface on its nose cup or cylinder end. Three long tie studs hold the pressure packing together. The stud holes are not PAGE 5 - 24 11/01
FOR MODELS: JG AND JGA SECTION 5 - MAINTENANCE equally spaced. This prevents the stack of parts from being aligned incorrectly. Remove the stud nuts and the pressure packing can be un-stacked. Replace these nuts each time the pressure packing is serviced. 7. Ring wear can be determined by placing the assembled rings, (note matchmarks), on the piston rod. Check end gap clearance. If the ends butt, or nearly butt, they should be replaced by new rings. 8. Fins or wire edges on the rings due to wear should be carefully filed off so that all matching edges will be square. 9. The metal gasket on the end cup can be pried loose with a sharp awl. Be careful not to scratch the sides of the gasket groove. 10. Before reassembly be certain all parts are perfectly clean. Piston Rod Packing - Reassembly 1. Be sure to refer to the pressure packing assembly in your parts book. Please contact your distributor if you do not have a parts book. A pressure packing assembly drawing also is packaged with each pressure packing re-build kit. 2. If installing a new set of rod rings in an existing packing case, the case parts need to be inspected for wear. Cups should be smooth and flat on the back side where the rod rings must seal. If the cups or grooves have worn concave or tapered, they should be reground or relapped. It is rarely necessary to alter the crosshead side of the cups, however, if this is found necessary, care must be taken so that the correct side clearance for the renewal rings is not destroyed. NOTE: IF PREMATURE WEAR IS SUSPECTED, REFER TO THE ARIEL See “Cylinder And Packing Lubrication Requirements” on page 4-5. 3. Before a packing case is installed, it should always be disassembled and thoroughly cleaned in an appropriate solvent for the intended service. 4. Make sure that each rod ring and cup is properly positioned and that rings are liberally coated with a clean lubricant before reassembly. 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. 5. 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 ensure proper sealing. After the tie stud nuts are tightened, all rings should be free to “float” radially in each cup. 6. 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. 7. Prior to installing the packing case into the cylinder, the end cup gasket must be inspected for nicks and damage that would cause it to leak in service. When in doubt, replace the gasket with a new one. 11/01 PAGE 5 - 25
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Heavy Duty Balanced Opposed Compressors

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