FOR MODELS: JGW, JGR AND JGJ SECTION 5 - MAINTENANCE
PAGE 5 - 26 1/01
5. Parts should be laid out on a work bench so that they can be installed progres-
sively with each in its correct position and the rod rings with their proper faces
toward the pressure. Note that all rod ring segments are carefully lettered and
must be assembled accordingly. This is most important in order to ensure
proper sealing. After the tie stud nuts are tightened, all rings should be free to
“float” radially in each cup.
6. For new installations, care must be given to the cleaning of all accumulated dirt
in the lines and compressor because foreign material will lodge in the packing to
become destructively abrasive.
7. Prior to installing the packing case into the cylinder, the end cup gasket must be
inspected for nicks and damage that would cause it to leak in service. When in
doubt, replace the gasket with a new one.
8. Before installing the packing case into the cylinder, be sure the gasket surface in
the packing counter bore on the crank end of the cylinder is clean and not
scratched.
9. Reinstall the complete packing case assembly with the oil supply point on top.
Using the rod packing bolts, pull the packing into place.
10. Reinstall the packing diaphragm and wiper packing.
11. Reinstall the piston and rod. Follow the steps under “Piston and Rod - Installa-
tion” on page 5-21.
12. After the crosshead nut has been tightened, tighten the rod packing bolts evenly
to the recommended torque in Table 1-11 on page 1-15. This procedure will
ensure that the pressure packing comes up square on its nose gasket. Align-
ment is readily accomplished by the use of feelers to maintain a uniform clear-
ance all around between the case bore and the rod.
13. Retighten the small tie stud nuts. Reinstall the tubing connections for the oil sup-
ply, primary vent and/or coolant. Take care not to cross-thread the tubing nuts.
Tubing nuts must be tight.
NOTE: AFTER INSTALLING THE NEW PRESSURE PACKING RINGS, REFER TO
“Force Feed Lubrication System” on Page 4-18 FOR INSTRUCTIONS FOR
PRIMING THE FORCE FEED LUBE SYSTEM. PRIMING SHOULD BE
REPEATED EACH TIME A COMPRESSOR IS STARTED BECAUSE OIL LINES
MAY HAVE BEEN BLED DURING DOWN TIME. FOLLOW INSTRUCTIONS IN
THE NOTE on page 4-10 AND Table 4-1 on page 4-8 FOR LUBRICATION
RATES THAT ARE RECOMMENDED FOR BREAK-IN OF A NEW MACHINE.
BREAK-IN LUBE RATES ARE TWICE THE NORMAL RATES - OR ONE-HALF
THE NORMAL INDICATOR CYCLE TIME.
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