Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE Chain Adjustment 1. Roll the crankshaft to the tightest position of the chain. This prevents snugging up on the chain at a slack position and breaking rollers, or ruining the pump and lubricator bearings when the chain goes through its tightest position. 2. Measure the length of the longest most easily accessible span with a tape measure (sprocket center to center), where the deflection will be gauged. Determine the allowable deflection limits defined by the shaded areas in Figure 5-20 or Figure 5-21, for the 2 to 10 lb (9 to 45 N) Finger Pressure Straight Edge Machinist’s Scale Span Length FIGURE 5-19 CHAIN DEFLECTION MEA- SUREMENT - TYPICAL measured span (3 to 5% of the span). 3. Measure chain deflection from a straight edge held on the chain rollers where it wraps over the two sprockets of the span. Use a machinist’s scale with 0.01 inch or (0.5 mm) increments to measure the deflection distance from the straight edge to a chain roller at the center of the span. Apply a force of 2 to 10 lb (9 to 45 N) finger pressure to take the slack out of the chain. Do not apply excessive force since a force feed lube box drive shaft can bend and provide an inaccurate deflection measurement. Finger pressure is adequate. 4. If adjustment is required, remove the capscrews and plastic plugs from the eccentric cap. Rotate the cap clockwise, facing cap from outside, to line up the first two new capscrew holes. If this makes the chain too tight, try turning the cap around in a counterclockwise direction for a different hole lineup. 5. Replace and tighten the two capscrews hand wrench tight. 6. Roll the crankshaft to check the tightness in a number of positions. At its tightest position, the chain is to be adjusted so that the deflection is within the shaded graph limits in the figures. Replace the plastic caps to keep the holes clean. 7/09 PAGE 5 - 31
FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE Deflection, Inches Deflection, Millimeters 1.00 0.90 0.80 0.70 0.60 0.50 0.40 0.30 0.20 0.10 0.00 26 24 22 20 18 16 14 12 10 8 6 4 2 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Length of Measured Span, Inches FIGURE 5-20 ALLOWABLE CHAIN DEFLECTION, INCHES 0 40 70 100 130 160 190 220 250 280 310 340 370 400 430 460 Length of Measured Span, Millimeters FIGURE 5-21 ALLOWABLE CHAIN DEFLECTION, MILLIMETERS Chain and Sprocket Replacement The chains should be replaced if the elongation exceeds 0.084 inches (2.13 mm) over a 10 pitch length. The section of chain to be measured should be stretched tight, in place in the compressor and measured with vernier calipers. A reading made outside of the rollers at 10 pitches should be added to a reading between the inside of the same rollers and then divided by two. If the resulting calculation exceeds 6.334 inches (160.9 mm) for 5/8 pitch chain, or 3.834 inches (97.38 mm) for 3/8 pitch chain, the chain should be replaced. Where applicable, the master link will need to be removed to replace the chain. Any sprocket showing any undercutting should be replaced. See “Crankshaft - Chain Sprockets” on Page 5-22. PAGE 5 - 32 7/09
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Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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