solid end connecting rods that are connected to trunk-type pistons by hardened steel piston
pins. The separately cast cylinders, individually bolted to the crankcase, facilitate inspection
and maintenance when required. Air from the fan-type flywheel circulates across the inter-
cooler tubing and around each cylinder to remove much of the heat of compression. Mounted
on each of the cylinders is a valve and air head assembly. The valves are readily accessible
for maintenance without disturbing piping. Safety valves are provided for each stage of com-
pression.
1-9.
INDUCTION MOTOR. Complete details of the driving motor and its magnetic con-
troller will be found in Section VII.
1-10. BELT GUARD ASSEMBLY. The belt guard (Figure 1-2) is the totally enclosed type,
providing protection front and back as well as at the top and sides.
1-11. SUBBASE AND RECEIVER ASSEMBLY. The compressor, motor and belt guard as-
semblies are securely attached to a rugged, channel-section type, steel subbase which is
welded to an 80 gallon receiver {Figure 1-2). Installation of the complete Model 242D7-1/2
Air Compressor is readily made by bolting the receiver feet to a substantial base. The re-
ceiver has a rated Working Pressure of 200 psig at -25 to +600F.
1-12. CRANKCASE ASSEMBLY. The compressor crankcase (Figure 1-3) is a one-piece
shaft. The flywheel end cover is equipped with' an oil seal to prevent leakage of oil along the
crankshaft. The frame cover on the opposite end houses a starting unloader and pilot valve.
1-4
