Description
BA-921 CAT AIR BRAKE COMPRESSOR – C15 / C18 ENGINE (NEW)
PART NUMBER(S):
Fleet Products: 5012533N (New) 5012533X (Reman)| OE: 5012533X, 10R9375, K020284
DESCRIPTION:
Model: BA-921
Vehicles: Caterpillar C15, C18 Engines (Also fits: C7, C9, C11, C13 – verify application)
• Type: Single-cylinder, single-stage, reciprocating air brake compressor
• Mounting: Flange
• Air Inlet: Top mount
• Air Outlet: Side mount
• Rated Displacement: 15.8 CFM @ 1250 RPM
• Cooling: Water-cooled cylinder head, air-cooled crankcase
• Cylinder Head: Cast iron or aluminum
• Stroke: 54 mm
• Governor/Unloader Ports: Standard BA-921 configuration
• Valve Plate: Brazed steel with integrated air/coolant passages
• Weight: ~48–66 lbs
Applications:
Designed for installation on Caterpillar C15 and C18 diesel engines in heavy-duty truck applications. Also suitable for Detroit Series 60 EGR engines (2002–2006) and other commercial platforms requiring flange-mounted BA-921 configuration compressors. Ideal for fleets operating in vocational, long-haul, or high-demand braking environments. Compatible with air brake systems requiring ST-4 safety valve (not included).
CROSS-REFERENCE(S):
5012533X, 5012533, 10R9375, 5011427, 801463, 5012532, 5012531, K020284, K048943, K066838, OR1624, R9555012533X, 20R0178, 20R0176, 223-3637, 20R0178, 5012533, H5011427X, H5012533X, OR1624, MID5012533X, 170.AC5012533, 745-5012533X, ABP N13AC 20R0178, BC1-25566, BW 5012533X, BX5012533X
A cross-reference listing means this part should be a suitable replacement for the part numbers listed. Please confirm all dimensions match your application before installing.
IMPORTANT INSTALLATION NOTES:
✔ Confirm flange mount compatibility and air/water port alignment
✔ Use manufacturer torque specs and approved sealing gaskets
✔ Safety valve (ST-4) not included – install separately if required
✔ Replace or inspect governor and discharge line prior to install
✔ Fill coolant lines and torque all hydraulic fittings per OE specs
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Warranty Information
