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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Section 4 Part Replacement For Models: JGH:E:K:T<br />
Chain Adjustment<br />
1. Roll the crankshaft to the tightest position<br />
of the chain. This prevents snugging<br />
the chain at a slack position and<br />
breaking rollers, or ruining the pump<br />
and lubricator bearings when the chain<br />
goes through its tightest position.<br />
2. Use a tape measure to measure the<br />
longest most easily accessible span<br />
from sprocket center to sprocket center,<br />
where the deflection will be<br />
gauged. Determine allowable deflection<br />
limits for the measured span as<br />
defined by the shaded areas in<br />
Fig. 4-47.<br />
2 to 10 lb<br />
(9 to 45 N)<br />
Finger<br />
Pressure<br />
Machinist’s<br />
Scale<br />
Straight<br />
Edge<br />
Span<br />
Length<br />
3. Measure chain deflection from a<br />
straight edge held on the chain rollers<br />
where it wraps over the two sprockets<br />
of the span. Use a machinist’s scale<br />
with 0.01 inch or (0.5 mm) increments FIGURE 4-46 Chain Deflection Measurement - Typical<br />
to measure the deflection distance<br />
from the straight edge to a chain roller at the center of the span. Apply a force of 2 to 10 lb (9 to<br />
45 N) finger pressure to take the slack out of the chain. Do not apply excessive force since a<br />
force feed lube box drive shaft can bend and provide an inaccurate deflection measurement. Finger<br />
pressure is adequate.<br />
4. If adjustment is required, remove the capscrews and plastic plugs from the eccentric cap. Rotate<br />
the cap clockwise to line up the first two new capscrew holes. If this tightens the chain too much,<br />
turn the cap counterclockwise for a different hole alignment.<br />
5. Replace and tighten the two capscrews hand wrench tight.<br />
6. Roll crankshaft to check tightness in several positions. At its tightest position, the chain should<br />
deflect within the shaded limits in the figures below. Replace plastic caps to keep holes clean.<br />
Deflection<br />
1.00 (25)<br />
0.90 (23)<br />
0.80 (20)<br />
0.70 (18)<br />
0.60 (15)<br />
0.50 (13)<br />
0.40 (10)<br />
0.30 (8)<br />
0.20 (5)<br />
0.10 (3)<br />
0.00<br />
2<br />
(51)<br />
3<br />
(76)<br />
Max. Deflection<br />
Min. Deflection<br />
4 5 6 7 8 9<br />
(102) (127) (152) (178) (203) (229) 10<br />
(254) 11<br />
(279) 12<br />
(305) 13<br />
(330) 14<br />
(356) 15<br />
(381) 16<br />
(406) 17<br />
(432) 18<br />
(457)<br />
Length of Measured Span<br />
FIGURE 4-47 Allowable Chain Deflection, Inches (mm)<br />
Permissible<br />
Deflection<br />
PAGE 4-40 3/11
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