Heavy Duty Balanced Opposed Compressors
Heavy Duty Balanced Opposed Compressors
Heavy Duty Balanced Opposed Compressors
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FOR MODELS: JG AND JGA SECTION 5 - MAINTENANCE<br />
6” to 10” (15 to 25 cm)<br />
Long 1/2-13 UNC<br />
Threaded Rod<br />
1/2 -13 UNC<br />
Lock Nut<br />
Crankshaft<br />
1/2-13 UNC (Jack Nut) Turn this Nut<br />
to Jack Bearing Cap straight up.<br />
Drill an 5/8” (15 mm) Hole<br />
FIGURE 5-5: BEARING CAP PULLER<br />
13 to 16” (33 t0 40 cm)<br />
Long Steel Bar<br />
1/3-13 UNC<br />
Puller Hole<br />
7. Before removing the crankshaft from the crankcase, wooden saddles or a<br />
notched wooden crate with sides high enough to prevent the webs or oil slinger<br />
from touching bottom should be prepared in order to store the crankshaft during<br />
maintenance - even though it may be out for only a short time. In addition, the<br />
crankshaft should be adequately protected from above so that dropped tools or<br />
equipment cannot mar the surface of pins and journals.<br />
8. Turn the crankshaft so that sling lifting point(s) are above the center of gravity of<br />
the shaft, so that it does not want to rotate when lifted. Lift straight up with the<br />
ends of the crankshaft parallel to the frame. Two persons will be needed to<br />
safely remove the crankshaft as well as a crane or lift due to the weight of the<br />
crankshaft. Appropriately sized nylon slings should be used during this operation<br />
to avoid marring of the running surface of the crankshaft. Great care must<br />
be taken during this operation since the shaft could bind and become damaged.<br />
NOTE: THE LOWER HALF BEARING SHELLS SOMETIMES HAVE A TENDENCY TO<br />
STICK TO THE SHAFT JOURNALS BECAUSE OF THE CLOSE FITTING OILY<br />
SURFACES OF THE TWO PARTS. THEREFORE, WHEN THE SHAFT HAS<br />
BEEN LIFTED CLEAR OF THE SADDLES, APPROXIMATELY 1/4 INCHES OR 6<br />
mm, CHECK TO MAKE SURE THAT THE LOWER HALF BEARING SHELLS<br />
HAVE NOT COME OUT WITH THE SHAFT. IF SO, THE BEARING SHELLS<br />
SHOULD BE TAPPED BACK ONTO THE SADDLES BEFORE LIFTING THE<br />
SHAFT ANY FURTHER.<br />
9. While one person operates the crane, raising it very slowly, the second person<br />
must grasp the crankshaft at the drive end with one hand on the counterweight<br />
or one of the throws and the other hand on the end of the shaft to keep the<br />
11/01 PAGE 5 - 9
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