Always block vehicle wheels. Stop engine when working under a vehicle. Depleting vehicle air system pressure may cause
vehicle to roll. Keep hands away from chamber push rods and slack adjusters; they may apply as system pressure drops
Never connect or disconnect a hose or line containing air pressure. It may whip as air escapes. Never remove a
component or pipe plug unless you are certain all system pressure has been depleted.
Never exceed recommended air pressure and always wear safety glasses when working with air pressure. Never look into
air jets or direct them at anyone.
Never attempt to disassemble a component until you have read and understand recommended procedures. Some
components contain powerful springs and injury can result If not properly disassembled. Use only proper tools and observe
all precautions pertaining to use of those tools.
The function of the air compressor is to build up and mair
The wrist pins and bushings are lubricated by oil dripping
tain the air pressure required to operate air powered
from a drip-boss on the piston into a "catch-funnel" at the
device in air brake or air auxiliary systems.
top of the rod and through the drilled passage to the
bushings and pins. SEE FIG. 1.
The compressor is a single stage, reciprocating piston
type with two cylinders. The rated capacity of the
compressor is the piston displacement in cubic feet per
minute when operating at 1250 RPM.
The compressor has automatic type inlet valves. Its
unloading mechanisms are located in the cylinder block
and they have no external moving parts. The compressor
is a water cooled type.
The compressor is engine lubricated which obtains the
oil necessary to lubricate its moving parts from the
engine on which it is mounted. Oil is forced through the
oil passage in the crankshaft and out around each
connecting rod journal. The turning motion of the
crankshaft throws the oil that is forced out at the journals,
against the cylinder bores and crankcase walls,
lubricating the bores and crankshaft bearings.
FIGURE 1 - PISTONS & CONNECTING RODS