Heavy Duty Balanced Opposed Compressors

FOR MODELS: JG AND JGA SECTION 5 - MAINTENANCE
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 - Installation”
on page 5-20.
12. After the crosshead nut has been tightened, tighten the rod packing bolts evenly
to the recommended torque in Table 1-15 on page 1-15. This procedure will
ensure that the pressure packing comes up square on its nose gasket. Alignment
is readily accomplished by the use of feelers to maintain a uniform clearance
all around between the case bore and the rod.
13. Retighten the small tie stud nuts. Reinstall the tubing connections for the oil supply,
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 and Running Conditions” on Page 4-19 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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