FIGURE 1 - BA-921 COMPRESSOR
DESCRIPTION
The function of the air compressor is to provide and main-
tain air under pressure to operate devices in the air brake
and/or auxiliary air systems. The BA-921 compressor is a
single cylinder reciprocating compressor with a rated dis-
placement of 15.8 cubic feet per minute at 1250 RPM.
The compressor consists of a water cooled cylinder head
and valve plate assembly and an air cooled integral
crankcase and cylinder block. The cylinder head is an
aluminum casting which contains the required air and water
ports as well as an unloader piston. The valve plate
assembly consists of laminated and brazed steel plates
which incorporate various valve openings and channels for
UNLOADER
COVER
DISCHARGE
PORT(2)
CRANKCASE
WATER
PORT
CRANKCASE
COVER
CYLINDER
HEAD
VALVE PLATE
ASSEMBLY
OIL PORT
(APPLICATION SPECIFIC)
AIR INLET
PORT
WATER
PORT
GOVERNOR
CONNECTION
conducting air and engine coolant into and out of the cylinder
head.
The discharge valves are part of the valve plate assembly.
The cylinder head, with the valve plate comprise a complete
cylinder head assembly.
The cast iron crankcase and cylinder block assembly, houses
the piston, connecting rod, crankshaft and related bearings.
The BA-921 crankcase cover is stamped with information
identifying the compressor model, customer piece number,
Bendix piece number and serial number. See figure 2.
WATER
PORT
(MAY BE
DRILLED ON
SOME
MODELS)
main local global operation trouble-
menu search search shooting
SD-01-676
BA-921BENDIX AIR POWER COMPRESSOR
UNLOADER
PISTON
CONNECTING
ROD
SPRING
CRANKSHAFT
PISTON
PISTON RINGS
VALVE PLATE ASSY.
CRANKCASE AND
CYLINDER BLOCK
CYLINDER HEAD
BALANCE
PISTON
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