F
OR
M
ODELS
: JGI, JGM, JGN, JGP
AND
JGQ
S
ECTION
5 - M
AINTENANCE
PAGE 5-27
a flat surface until it can easily slide into the slots for a snug fit. If the key is too
high, file of the top edge for a snug fit.
7.
After the new key has been installed and it has been determined that the new
sprocket will fit, oil the new O-ring and remount the lubricator on the frame.
8.
Put the new sprocket onto the shaft.
9.
Check alignment to the crankshaft drive sprocket with crankshaft centered in
end play, using a straight edge, to within 1/32 inch (1 mm). Tighten the set
screw.
10. Install chain and adjust using the instructions given in “Chain Adjustment” on
11.
Re-attach all tubing to the lubricator.
Piston and Rod
NOTE: UTILIZE A DIAL INDICATOR WITH A MAGNETIC BASE TO INDICATE THE
LOCATION OF THE CROSSHEAD WHEN FINDING EXACT INNER AND OUTER
DEAD CENTER LOCATIONS.
Piston and Rod - Removal
1.
Follow steps 1. through 5. at “Crosshead - Removal” on page 5-11.
2.
With the cylinder head/unloader removed and the cross-head balance nut loos-
ened, use the piston turning/piston nut torquing tool (Ariel furnished tool) and a
speed wrench to screw the piston and rod assembly out of the crosshead. The
two dowels on the piston nut tool fit the holes in the piston nut. Turn the cross-
head nut off the piston rod.
3.
As the piston leaves the cylinder, be careful in handling the piston rings. Despite
CAUTION
TO PREVENT PERSONAL INJURY, BE SURE THAT COMPRESSOR CRANKSHAFT
CANNOT BE TURNED BY THE DRIVER OR COMPRESSOR CYLINDER GAS
PRESSURE DURING MAINTENANCE:
-- ON ENGINE-DRIVEN COMPRESSORS, REMOVE THE CENTER COUPLING OR
LOCK THE FLYWHEEL.
-- ON ELECTRIC MOTOR-DRIVEN COMPRESSORS, IF IT IS INCONVENIENT TO
DETACH THE DRIVER FROM THE COMPRESSOR, THE DRIVER SWITCH GEAR
MUST BE LOCKED OUT DURING MAINTENANCE.
BEFORE PERFORMING ANY MAINTENANCE, COMPLETELY VENT SYSTEM.
BEFORE REMOVING A CYLINDER HEAD OR VVCP, BACK OFF ALL CAP SCREW
1/8 INCH (3 mm). MAKE SURE THE HEAD IS LOOSE AND THE CYLINDER OR VVCP
IS COMPLETELY VENTED.
!