1
All SNA-01 compressors are equipped with a safety
valve to protect the compressor head in the event of, for
example, a discharge line blockage downstream of the
compressor. Excessive air pressure will cause the safety
valve to unseat, release air pressure, and give an audible
alert to the operator. The safety valve is installed in the
safety valve port of the discharge jumper. The discharge
jumper's function is to relocate the discharge port such
that easy installation to the existing vehicle discharge line
is permitted. It also enhances discharge air cooling.
DESCRIPTION
The function of the air compressor is to provide and
maintain air under pressure to operate devices in air
brake systems. The Bendix
®
SNA-01
™
Compressor is
a single-cylinder reciprocating compressor with a rated
displacement of 15.8 cubic feet per minute at 1250 RPM.
The compressor consists of a water-cooled cylinder head
assembly and an integral air-cooled crankcase assembly.
The cylinder head assembly is made up of the cylinder
head, discharge jumper, cooling plate, and valve plate
assembly. It uses two sealing gaskets and two o-rings.
The cylinder head, discharge jumper and cooling plate
are made from aluminum. The cylinder head contains air
and water ports as well as an unloader assembly. The
discharge jumper is connected to the cylinder head and re-
routes the discharge air to the discharge port of the cylinder
head assembly. It assists in cooling the compressor. A
cooling plate is located between the cylinder head and
valve plate assemblies and also assists in cooling.
The valve plate assembly consists of brazed steel plates
which have valve openings and passages for air and
engine coolant to flow into and out of the cylinder head. The
compressor's discharge valves are part of the valve plate
assembly. The inlet reed valve/gasket is installed between
the valve plate assembly and the top of the crankcase.
The cast iron crankcase houses the piston assembly,
connecting rod, crankshaft, and related bearings.
®
SD-01-10142
BENDIX
®
SNA-01
™
COMPRESSOR
FIGURE 1 -
BENDIX
®
SNA-01
™
COMPRESSOR
Safety
Valve
Valve Plate
Assembly
Crankcase
Cylinder
Head
Cooling
Plate
The Bendix
®
SNA-01
™
compressor is a service new
single cylinder compressor developed exclusively
for the following engines; Volvo
®
D11, D13 and D16;
and the Mack
®
MP7 and MP8 engines manufactured
from 2006 through 2010.
NOTE: A retrofit kit is included with the compressor
and is intended to support the retrofit of this
compressor only on the engines and time frame
specified above.
Rear End
Cover
Crankshaft
Discharge Jumper
Inlet Fitting
Coolant Fitting
