Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE crosshead guide. A 0.0015 inches (0.04 mm) feeler stock should not be able to be inserted more than 1/2 inches (13 mm) at all four corners of the crosshead. Before rotating the crankshaft, operate the pre-lube pump to lubricate the bearings. Position the dial indicator 1 stem against the piston rod, close to the packing case. Set the indicator to zero with the piston at the crank end. Readings are to be taken in both the vertical and horizontal directions. When measuring vertical rod movement, upward movement will be recorded as positive, downward movement will be recorded as negative. When measuring horizontal rod movement, rod movement toward the auxiliary end of the frame, will be recorded as a positive reading, movement toward the drive end of the frame will be recorded as a negative reading. Copy Table 5-2 to record readings. Manually rotate the crankshaft and record readings at mid-stroke and with piston at the head end. TABLE 5-2 PISTON ROD RUN OUT THROW NUMBER: 1 2 3 4 5 6 VERTICAL HORIZONTAL Compare readings to Table 5-3. Piston @ CE Mid-Stroke Piston @ HE 0 0 0 0 0 0 Piston @ CE Mid-Stroke Piston @ HE 0 0 0 0 0 0 TABLE 5-3 MAXIMUM ACCEPTABLE PISTON ROD RUN OUT READINGS DIRECTION INCHES (mm) Vertical 0.0025 (0.064) Horizontal 0.0010 (0.025) If a vertical reading is greater than the maximum acceptable reading, the following procedure is to be used to determine acceptability: With the piston at the head end, use feeler gages to determine clearance at the top of the piston. On wear band or rider ring pistons, this clearance is over the rings or wear band. Feeler top clearance is to be divided by two (/ 2) and then subtract (-) 0.005 inches (0.13 mm). Place a feeler of this calculated thickness under the bottom of the piston. Place the feeler under the wear band or rider ring on wear band or rider ring pistons. This feeler is to be long enough to stay under the piston as the piston is moved throughout its stroke. Re-measure vertical run out and compare to accept- 1. Use a 0.0001 inches (0.001 mm) increment calibrated dial indicator. 7/09 PAGE 5 - 41
FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE able limits in the table above. The horizontal readings, taken without the use of feelers are to be used for acceptance. Copy Table 5-4 and record calculations and readings. TABLE 5-4 FEELER THICKNESS TO CORRECT FOR PISTON WEIGHT LINE If readings are not within acceptable limits after replacing worn parts and correcting any piping misalignment, the piston rod assembly should be replaced. Piston Rings Most JGZ and JGU cylinders use one-piece angle cut filled Teflon piston rings. High-pressure cylinders use two-piece thermoplastic rings, reference Figure 5-29 on Page 5-43. Determining Ring Wear: <strong>Ariel</strong> recommends replacing rings when the end gap has increased to three times the new dimension. To measure the end gaps, insert the rings in the cylinders without pistons. (See Table 1-9 on Page 1-15 or Table 1-10 on Page 1-17 for new and maximum end gap dimensions.) Removal: THROW NUMBER: See paragraph 5. at “Piston and Rod - Removal” on Page 5-36 for piston ring removal. Wear Bands Most JGZ and JGU pistons use one, one-piece angle cut filled Teflon wear band. High-pressure cylinders use two-piece thermoplastic wear bands, reference Figure 5-29 on Page 5- 43. Determining Wear Band Wear: 1 2 3 4 5 6 1 Top Feeler Clearance 2 Line 1 (/2) 3 Line 2 - 0.005 inches - 0.005” - 0.005” - 0.005” - 0.005” - 0.005” - 0.005” (-0.13mm) (-0.13mm) (-0.13mm) (-0.13mm) (-0.13mm) (-0.13mm) (-0.13mm) 4 Bottom Feeler Thickness 5 Vertical, Piston @ CE 0 0 0 0 0 0 6 Vertical, Piston @ HE Since the wear band does not work as a sealing ring the maximum end gap is not important, but the minimum end gap is required. To measure the end gap, insert a new wear band in the cylinder bore without the piston. (See Table 1-9 on Page 1-15 or Table 1-10 on Page 1- 17 for minimum end gap and new radial projection dimensions.)Wear band projection beyond the outer diameter of the piston is also important. Wear band projection can be checked by measuring piston to cylinder bore clearance at the bottom of the bore. This can PAGE 5 - 42 7/09
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Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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