Description
BA-921 CAT AIR BRAKE COMPRESSOR (REMANUFACTURED)
PART NUMBER(S):
Fleet Products: 5012533X (Remanufactured) 5012533N (New) | OE: Bendix Reman: 5012533, 5012533B1, 5012533BXR, 5012533C, 5012533N, 5012533X, 5012533X-C, R9555012533X | Bendix Reman for Caterpillar: 5012532, 5012532X, K020284, K048943, K066838 | Bendix Service for Caterpillar: 5012531, 5012531X, K020285, K048942, K066832 | Bendix OE for Caterpillar: 5011427, 5011427X, K020283, K048941, K066812 | CAT OE: 0R1624, 0R-1624, 10R9375, 10R-9375, 20R0176, 20R0178, 20R-0178, 2233637, 223-3637, 3049991, 304-9991, 3537137, 353-7137, 3850937, 385-0937, 385-0935 | Bendix Service: 801463 | International: 3861777C91, K041109, K055513, K055514
DESCRIPTION:
Model: BA-921 40 Teeth ACERT Engines (Pre-2007)
Vehicles: Caterpillar C15 / C18 Engine Platforms
• Mounts directly to C15/C18 CAT engines
• Engine-driven, dual-cooled (air + water) design
• Top-mounted air inlet
• Side-mounted air outlet
- Cylinders: 1
- Bore x Stroke: 3.622 in x 2.126 in
- Displacement @1250 RPM: 15.8 CFM
- Flow @1800 RPM /120 PSI: 11.6 CFM
- Flow @3000 RPM /120 PSI: 16.5 CFM
- HP @1800 RPM /120 PSIG: 4.6 HP (loaded) / 0.8 HP (unloaded)
- Min Coolant Flow @Max RPM: 1.5 gpm
- Oil Pressure (min): 15 PSI
- Governor Cut-Out (min): 120 PSI
- Unloader Line: 3/16 in ID
- Temp Range: 170°F inlet / 400°F discharge
Port Sizes & Required Torque
- Cylinder Head (M8): 265–292 in-lb
- Governor Adapter (M8): 195–213 in-lb
- Rear End Cover (M10): 195–213 in-lb
- Inlet Port Fitting (M27x2): 991–1089 in-lb
- Discharge Port Fitting (M22x1.5): 814–912 in-lb
- Water Port Fitting (M18x1.5): 593–637 in-lb
- Oil Port (7/16-16 UNF): 150–170 in-lb
- Unloader Port (1/8-27 NPT): 2–3 turns from finger tight
- Bendix ST-4 safety valve 801116 (7/8"-14) not included
- Include installation gaskets and orings.
Applications:
Used extensively in Caterpillar-powered heavy trucks, mining haulers, construction vehicles, and other off-highway commercial equipment requiring constant air supply for brake and auxiliary pneumatic systems.
CROSS-REFERENCE(S):
046255012533X, 0R1624, 0R-1624, 10R9375, 10R-9375, 1651799212, 165-179-9212, 20R0178, 20R-0178, 2233637, 223-3637, 3049991, 304-9991, 3537137, 353-7137, 3850937, 385-0937, 5011427, 5011427X, 5012531X, 5012532, 5012532X, 5012533, 5012533B1, 5012533BXR, 5012533C, 5012533X, 5012533X-C, 702376AT, 7455012533, 745-5012533, 7455012533X, 745-5012533X, 745X5012533, 745X-5012533, 801463, BAR5012533, BDR5012533X, BEN5012533X, BEX5012533X, BW 5012533, BW 5012533X, BW R5012533, BW R5012533/CR, BW5012533, BW5012533X, BWR 50125333X, BWX5012533X, BX 5012533X, BX5012533, BX5012533X, BXC-5012533X, EX5012533X, HVG5012533X, K020283, K020284, K020285, K048941, K048942, K048943, K066812, K066832, K066838, R9555012533X, ROY-5012533X, 20R0176, 5012531, 5012533N, 0R1624, 0R-1624, 10R9375, 10R-9375, 20R0176, 20R0178, 20R-0178, 2233637, 223-3637, 3049991, 304-9991, 3537137, 353-7137, 3850937, 385-0937, 385-0935, CA 2233637, CA 3049991, CA 3850937, CA 20R0178 | BENDIX: 5011427, 5011427X, 5012531, 5012531X, 5012532, 5012532X, 5012533, 5012533B1, 5012533BXR, 5012533C, 5012533N, 5012533X, 5012533X-C, 801463
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:
✔ Always inspect or replace discharge line from compressor head
✔ Avoid sharp bends, restrictions, or damaged air lines
✔ Follow CAT or OE torque specs and gasket guidelines for proper sealing
✔ Confirm compatibility with specific C15/C18 engine casting and mounting
SOLD AS REMANUFACTURED – CORE RETURN REQUIRED
Built to OEM standards — thoroughly cleaned, inspected, and tested to ensure durability, performance, and reliability in demanding applications.
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Warranty Information
