Heavy Duty Balanced Opposed Compressors

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FOR MODELS: JG AND JGA SECTION 5 - MAINTENANCE vertical and horizontal directions. When measuring vertical rod moment, 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. Bar over crankshaft by hand and record readings at mid-stroke and with piston at the head end. TABLE 5-2: PISTON ROD RUN OUT VERTICAL HORIZONAL THROW NUMBER: 1 2 3 4 5 6 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 JG & JGA INCHES (mm) Vertical 0.0010 (0.025) Horizontal 0.0005 (0.013) If a vertical reading is greater than the maximum acceptable reading, the following procedure is 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 pistons this clearance is over the band. Feeler top clearance is divided by ()) 2 and then the following amount is subtracted: (-)0.003 inches (0.08 mm). Place a feeler of this calculated thickness under the bottom of the piston. Place the feeler under the wear band on wear band pistons. This feeler should be long enough to stay under the piston as the piston is moved throughout its stroke. Re-measure vertical run out and compare to acceptable 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 THROW NUMBER: 1 2 3 4 5 6 1 Top Feeler Clearance 2 Line 1 ()2) 3 Line 2 - 0.003” (-0.08 mm) - 0.003” (-0.08 mm) 4 Bottom Feeler Thickness 5 Vertical~Piston @ CE 0 0 0 0 0 0 6 Vertical~Piston @ HE PAGE 5 - 22 11/01
FOR MODELS: JG AND JGA SECTION 5 - MAINTENANCE 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 All JG and JGA cylinders use one-piece angle-cut filled Teflon piston rings, excepting tandem cylinders classes which use stepped seal-joint piston rings (refer to Figure 5-12:), and very small cylinder and rider rings which use two-piece rings. Stepped seal-joint rings are standard for high-pressure tandem cylinders. Seal-joint piston rings are directional and must be installed properly. To utilize the seal-joint rings in double acting cylinders, in place of angle cut rings, contact Ariel for new part numbers. Determining Ring Wear: Ariel recommends replacing rings when the end gap has increased three times the new dimension. To measure the end gaps, insert the rings in the cylinders without pistons. (See Table 1-6 on page 1-10, through Table 1-10; Table 1-13 and Table 1-14 for new end gap dimensions.) Removal: FIGURE 5-12: SEAL-JOINT RINGS Stamped Side Toward Pressure See paragraph 4 at “Piston and Rod - Removal” on page 5-18 for piston ring removal. 11/01 PAGE 5 - 23
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Heavy Duty Balanced Opposed Compressors

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