Heavy Duty Balanced Opposed Compressors - Ariel Corporation
Heavy Duty Balanced Opposed Compressors - Ariel Corporation
Heavy Duty Balanced Opposed Compressors - Ariel Corporation
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FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE<br />
required to loosen/tighten the crosshead-balance nut. Tighten the nut with<br />
the hydraulic crosshead-balance nut torque tool properly configured and<br />
positioned in the right hand crosshead guide window when looking at<br />
compressor frame standing at cylinder for pushing against the top of the<br />
window. See Table 1-11 on Page 1-18 for the hydraulic pressure to be<br />
applied to the torque tool.<br />
b. Install the tool to position the spanner wrench adapter open area toward the<br />
spanner wrench as shown in Figure 5-10 on Page 5-16. Apply hydraulic<br />
pressure to the cylinder to tighten the crosshead-balance nut. When the<br />
cylinder moves to the end of its travel, release the pressure and index the<br />
cylinder to the spanner wrench slot and/or spanner wrench to adapter, until<br />
the nut stops moving at the specified hydraulic pressure with cylinder in midstroke.<br />
If during tightening, the adapter open area turns 90° before nut is<br />
tight, remove the spanner wrench. Remove the bolting in the spanner<br />
wrench adapter to the crosshead-balance nut and reposition the adapter so<br />
the open area again faces the spanner wrench.<br />
CAUTION: DO NOT ALLOW THE OPEN AREAS OF THE SPANNER WRENCH AND<br />
THE ADAPTER TO OVERLAP AS THE SPANNER WRENCH CAN BE<br />
SPRUNG. IF THE SPANNER WRENCH BECOMES SPRUNG, DESTROY IT<br />
AND REPLACE IT.<br />
c. When the nut is tight, the feeler gage can be removed by hand. Be sure that<br />
all tools have been removed from the cylinder.<br />
12. With the head end head or VVCP (closed position) properly installed and fasteners<br />
properly tightened, manually rotate the crankshaft 180° to the exact outer<br />
dead center position of the throw.<br />
13. Remove a top head end valve.<br />
14. Determine the required piston head end clearance limits from the cylinder identification<br />
plate, refer to Table 1-4 on Page 1-13. Measure head end clearance at<br />
the top of the head end. Using feeler gages through the open valve pocket,<br />
check the head end clearance. Determine that the measured clearance is within<br />
the required clearance limits.<br />
15. Tighten the set screws in the crosshead-balance nut.<br />
16. Re-install the valve assemblies and properly tighten the fasteners. See “Valves -<br />
Reassembly” on Page 5-57 and “Tightening Valve Cap Bolting” on Page 5-59.<br />
17. Check crosshead to guide clearances and piston rod runout upon re-assembly,<br />
any time a piston rod is removed. See Table 1-4 on Page 1-13 for crosshead<br />
clearances and “Piston Rod Run Out” on Page 5-40.<br />
18. Be sure that all tools, measuring and lifting equipment, supplies, replaced parts,<br />
etc. have been removed from the crosshead guide. Reinstall the crosshead<br />
guide side covers and gaskets, tighten all cap screws hand wrench tight. If there<br />
is any doubt that an old gasket is not in good usable condition, install a new gasket.<br />
Before installing a gasket, apply a light coating of anti-seize lubricant to both<br />
sides or to the metal seating surfaces. This will help to hold the gasket in place<br />
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