Heavy Duty Balanced Opposed Compressors - Ariel Corporation

FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE
2. Remove oil wiper gland(s) from the crosshead and oil wiper packing.
3. Disconnect all tubing and instrumentation (if applicable) from the packing flange.
Remove the twelve point cap screws that hold the pressure packing gland to the
crank end of the cylinder/head.
4. At this point do not remove the small stacking tie rod nuts from the studs, as they
hold the entire packing case together, so it can be removed as an assembly.
5. Pull the entire pressure packing out into the crosshead guide. It will then come
out through the large side opening of the guide. The pressure packing may now
be taken to a clean place for disassembly.
6. Set the pressure packing on a clean surface on its nose cup (cylinder-end
down). Match mark the outside diameter of the cups to be sure of proper reassembly.
Long tie studs hold the pressure packing together. The stud holes are
not equally spaced. This prevents the stack of parts from being aligned incorrectly.
Remove the stud nuts and the pressure packing can be un-stacked.
Replace these nuts each time the pressure packing is serviced.
7. Ring wear can be determined by placing the assembled rings, (note matchmarks),
on the piston rod. Check end gap clearance. If the ends butt, or nearly
butt, they should be replaced by new rings. See “Types of Piston Rod Packing
Rings” on Page 5-46 for end gaps.
8. Fins or wire edges on the rings due to wear should be carefully filed off so that
all matching edges will be square.
9. Remove the spiral wound gasket on the end cup by prying loose with a sharp
awl. Be careful not to scratch the sides of the gasket groove. Discard old gasket.
10. Before reassembly be certain all parts are perfectly clean.
Piston Rod Packing - Reassembly
1. Be sure to refer to the pressure packing assembly in your parts book. Ariel supplies
parts books with each unit. Please contact your distributor if you do not
have a parts book. A pressure packing assembly drawing also is packaged with
each pressure packing re-build kit.
2. Care must be taken to prevent scratching the mating surfaces of the cups, which
can cause leaks. Cup surfaces must be clean and dry when being re-assembled.
3. Before a packing case is installed, it should always be disassembled and thoroughly
cleaned in an appropriate solvent for the intended service.
4. If installing a new set of rod rings in an existing packing case, the case parts
need to be inspected for wear. Cups should be smooth and flat on the back side
where the rod rings must seal. If the cups or grooves have worn concave or
tapered, they should be reground or re-lapped. Do not reduce the cup thickness
to less than the rework dimension shown on the packing assembly drawing in
the Ariel Parts Book. It is rarely necessary to alter the crosshead side of the
cups, however, if this is found necessary, care must be taken so that the correct
side clearance for the renewal rings is not destroyed.
NOTE: IF PREMATURE WEAR IS SUSPECTED, REFER TO “Cylinder and Packing
Lubrication” ON PAGE 4-16.
5. Before assembling the rings into the case, following is recommended: Put each
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