Leakage past the discharge valves can be detected by
removing the discharge line, applying shop air back
Clean oil supply line. Before connecting this line to the
through the discharge port and listening for escaping air.
compressor run the engine briefly to be sure oil is flowing
Also the discharge valves and the unloader pistons can
freely through the supply line.
be checker for leakage by building up the air system until
the governor cuts out, then stopping the engine. With the
Clean the oil return line.
engine stopped, carefully listen for escaping air at the
intake. To pinpoint leakage if noted, squirt oil around the
Prelubricate compressor cylinder walls and bearings with
unloader pistons. If there is no noticeable leakage at the
clean engine oil before assembling compressor.
unloader pistons, the discharge valves may be leaking.
If the compressor does not function as described above,
Always use a new mounting gasket Inspect gear and
or leakage is excessive, the compressor should be
associated parts for wear or damage.
They must be a neat fit on compressor crankshaft.
REMOVING AND INSTALLING
Replace gear if worn or damaged.
Install gear on compressor crankshaft making sure it
properly contacts the shaft. Tighten crankshaft nut to 65-
Drain air brake system.
70 ft. lbs.
Drain engine cooling system, compressor cylinder head
Be sure the air cleaner is clean and properly installed.
Clean or replace any damaged or dirty air or water lines
Disconnect all air lines, water and oil lines to and from
which may be corroded, before connecting them to the
compressor. Use a new discharge fitting gasket.
Remove compressor mounting bolts and compressor
Tighten mounting bolts securely and evenly.
After installation run compressor and check for air, oil, or
Use a gear-puller to remove the gear from compressor
water leaks at compressor connections. Also check for