Heavy Duty Balanced Opposed Compressors - Ariel Corporation

13.11.2012 Views
FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE SECTION 5 - MAINTENANCE General Introduction The major components of the frame assembly are the crankcase, crankshaft and bearings, connecting rods, chain drive system, crossheads and guides, and distance pieces. A rolled-in oil gallery runs the length of the crankcase. Drilled oil passages feed lubricating oil to the running gear. Removable top covers, crosshead guide side covers and end covers provide generous access for inspecting and removing internal components. The top covers are made of aluminum for easy handling. Absolute cleanliness, including the use of lint-free wiping cloths, is a necessity during any maintenance on the compressor. When access covers are removed from the frame or the compressor cylinders are open, keep covered to protect the interiors from dust except when actually working within them. Any components that are removed should be protected from corrosion, dust and falling objects that might mar or chip running surfaces. Whenever the machine is dismantled, gaskets at non-pressure positions are to be carefully inspected before reuse, if damaged they should be replaced. Gaskets at pressure locations should be replaced. During major overhauls, drain and flush the crankcase. If replacing any major reciprocating component, that is; a connecting rod assembly, piston, piston and rod assembly, crosshead-balance nuts or crosshead, weigh component parts and compare to the Compressor Balancing Record sheet that comes in the parts manual with each compressor. If there are weight changes, recalculate opposing throw reciprocating weight differential. See “Opposed Throw - Reciprocating Weight Balancing” on Page 1-1. ! CAUTION TO PREVENT PERSONAL INJURY, BE SURE THAT THE COMPRESSOR CRANK- SHAFT CANNOT BE TURNED BY THE DRIVER OR COMPRESSOR CYLINDER GAS PRESSURE DURING MAINTENANCE: -- ON ENGINE-DRIVEN COMPRESSORS, REMOVE THE COUPLING CENTER MEMBER OR LOCK THE FLYWHEEL. -- ON ELEC- TRIC MOTOR-DRIVEN COMPRESSORS, IF IT IS INCONVENIENT TO DETACH THE DRIVER FROM THE COMPRESSOR, THE DRIVER SWITCH GEAR MUST BE LOCKED OUT DURING MAINTENANCE. BEFORE STARTING ANY MAINTENANCE OR REMOVING ANY COMPONENTS, RELIEVE ALL PRESSURE FROM THE COMPRESSOR CYLINDERS. (SEE PACK- AGER’S INSTRUCTIONS FOR COMPLETELY VENTING THE SYSTEM.) 7/09 PAGE 5 - 1

FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE Positioning a Throw for Maintenance Compressor maintenance often requires manually rotating the crankshaft to locate a particular throw in one of two positions: the inner dead center or the outer dead center. During normal operation, the crossheads slide back and forth in the crosshead guides. In the inner dead center position, the crossheads slide in toward the crankcase as far as possible. In the outer dead center position, the crossheads slide out away from the crankcase as far as possible (see figures below). Some procedures, such as setting piston end-clearances, require a dial indicator with magnetic base to locate the precise inner or outer dead center. Connecting Rod ! CAUTION AFTER PERFORMING ANY MAINTENANCE, THE ENTIRE SYS- TEM MUST BE PURGED WITH GAS PRIOR TO OPERATION, TO AVOID A POTENTIALLY EXPLOSIVE AIR/GAS MIXTURE. Inner Dead Center Position Outer Dead Center Position In the figure to the right, the throw on the left is in its highest position and the throw on the right is in its lowest position. Highest and Lowest Throw Position FIGURE 5-1 THROW POSITIONING The connecting rod has a tri-metal (steel, bronze, and babbitt with a tin flash coat) precision split (2-piece shell) bearing. There are notches in the rod and rod cap for the bearing tabs in order to position and maintain the position of the bearing halves. Do not remove the connecting rod cap to check for bearing wear, if a cap is removed it is recommended that a new bearing is installed, i.e. DO NOT REUSE BEARING SHELLS. PAGE 5 - 2 7/09

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