Ariel JGJ Series, Technical Manual

Page: 97 / 141

F
OR
M
ODELS
: JGW, JGR
AND
JGJ S
ECTION
5 - M
AINTENANCE
1/01 PAGE 5 - 25
2. Remove packing diaphragm and oil wiper packing.
3. Disconnect the lube oil tube and/or coolant connections from the top of the pack-
ing gland and the primary vent tube from the bottom of the gland. Remove the
twelve point capscrews that hold the pressure packing gland to the cylinder.
4. At this point do not remove the small nuts from the studs. These studs hold the
entire packing case together so it can be removed as an assembly.
5. Screw two short 3/8-16 UNC capscrews into the two tapped holes provided in
the crankend face of the packing gland. A screwdriver or pry bar under the
heads of the capscrews can be used to pull the entire pressure packing out into
the crosshead guide. It will then come out through the 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 or cylinder end.
Three 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 unstacked. Replace
these nuts each time the pressure packing is serviced.
7. Ring wear can be determined by placing the assembled rings, (note match-
marks), on the piston rod. Check end gap clearance. If the ends butt, or nearly
butt, they should be replaced by new rings.
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. The metal gasket on the end cup can be pried loose with a sharp awl. Be careful
not to scratch the sides of the gasket groove.
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 sup-
plies four 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. 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 relapped. 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 THE ARIEL “Cylinder And
Packing Lubrication Requirements” on Page 4-5.
3. Before a packing case is installed, it should always be disassembled and thor-
oughly cleaned in an appropriate solvent for the intended service.
4. Make sure that each rod ring and cup is properly positioned and that rings are
liberally coated with a clean lubricant before reassembly. Examine all parts for
unusual nicks or burrs which might interfere with the free floating of the rod ring
in the cups. Particular care should be taken with rod rings made of soft materi-
als, such as bronze or TFE, and it is extremely important that wiper rings be
handled and installed so as to prevent damage to the scraping edges.