FOR MODELS: JGW, JGR AND JGJ SECTION 5 - MAINTENANCE
PAGE 5 - 14 1/01
4. Replace the dust plugs in the eccentric adjustment cap to keep dirt out of the
unused holes in the end cover.
Chain and Sprocket Replacement
The chain 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 be
divided by two. If this calculation exceeds 5.084 inches (129.1 mm) for 1/2 pitch, the chain
should be replaced. Any sprocket showing any undercutting should be replaced.
Eccentric Vernier - Chain Idler Sprocket Replacement (Self-Align Sprocket)
1. A typical chain idler sprocket is shown in Figure 5-8: on Page 5-15.
2. Remove the frame top cover. Remove the dust plugs and the two capscrews
that hold the eccentric adjustment cap to the end cover. Rotate the eccentric cap
to loosen the chain for removal. After dropping the chain off the idler sprocket,
the entire assembly can be removed from the end cover.
3. Remove the locknut, capscrew, sprocket and Stat-O-Seal washer. Discard
these items since they must be replaced with new parts. Remove and discard
the cap O-ring.
4. Reassemble all parts using a new capscrew, Stat-O-Seal washer, sprocket, and
locknut. Tighten the idler locknut to the recommended torque shown in Table 1-
11 on page 1-15.
5. Install the assembly on the end cover.
6. Apply oil and install a new O-ring. Install the assembly and adjust the chain
according to the instructions given in “Chain Adjustment” on page 5-13.
TABLE 5-2: CHAIN DEFLECTION LIMITS
COMPRESSOR MODEL
DEFLECTION LIMITS
FORCE FEED LUBRICATOR TO IDLER, INCHES (mm)
JGW, JGR & JGJ - 2 Throw 0.065 to 0.109 (1.65 to 2.77)
JGW, JGR & JGJ - 4 Throw 0.068 to 0.114 (1.73 to 2.90)
JGJ - 6 Throw 0.053 to 0.088 (1.35 to 2.24)
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