Description
5012533X BA-921 CAT AIR BRAKE COMPRESSOR – REMANUFACTURED
PART NUMBER(S):
Fleet Products: 5012533X (Remanufactured), 5012533N (New) | Replaces OE: Bendix: 5011427, 5011427X, 5011441, 5012459, 5012464, 5012510, 5012531, 5012531X, 5012532, 5012532X, 5012533, 5012533B1, 5012533BXR, 5012533C, 5012533N, 5012533X, 5012533X-C, 5014177, 5014180, 5014235, 5014236, 5014401, 5014402, 5014427, 5014428, 801463, 801465, 801798, 801826, K020283, K020284, K020285, K048938, K048939, K048940, K048941, K048942, K048943, K056646, K056647, K056649, K066811, K066812, K066831, K066832, K066837, K066838, K209254, K209255, K209328, K209329 | CAT: 0R-1623, 0R-1624, 0R1624, 10R-9375, 10R9375, 20R-0177, 20R-0178, 20R0176, 20R0178, 223-3636, 223-3637, 2233637, 253-1736, 255-4160, 304-9991, 3049991, 353-7136, 353-7137, 3537137, 385-0935, 385-0936, 385-0937, 3850937 | Navistar: 3861777C91, K041109, K055513, K055514 | Mack: 745-5012533, 745-5012533X, 7455012533, 7455012533X, 745X-5012533, 745X5012533 | Automann: 170.AC5012533
DESCRIPTION:
Model: BA-921 40-Tooth CAT Air Brake Compressor with External Oil Line
Vehicles: Caterpillar C15/C18 ACERT engines, pre-2007, and Detroit Series 60 EGR engines, 2002–2006
• Drive Gear: 40 teeth
• External Oil Line: Yes
• Air Inlet: Top-mounted
• Air Outlet: Side-mounted
• Mounting: Flange mount, direct engine mounting
• Cooling: Air and water cooled
• Cylinders: 1, 358 CC
• Bore × Stroke: 3.622 in × 2.126 in
• Rated Displacement: 15.8 CFM @ 1250 RPM
• Air Flow: 11.6 CFM @ 1800 RPM / 120 PSI; 16.5 CFM @ 3000 RPM / 120 PSI
• Power Requirement: 4.6 HP loaded / 0.8 HP unloaded @ 1800 RPM / 120 PSIG
• Minimum Coolant Flow: 1.5 GPM @ maximum RPM
• Minimum Oil Pressure: 15 PSI
• Minimum Governor Cut-Out Pressure: 120 PSI
• Unloader Line Size: 3/16 in I.D.
• Temperature Range: 170°F inlet / 400°F discharge
• Inlet Port Fitting: M27 × 2
• Discharge Port Fitting: M22 × 1.5
• Water Port Fitting: M18 × 1.5
• Oil Port: 7/16-16 UNF
• Unloader Port: 1/8-27 NPT
• Safety Valve Port: 7/8-14; compatible Bendix ST-4 801116 not included
• Includes: Installation gaskets and O-rings
Applications:
Used on Caterpillar C15/C18 ACERT and Detroit Series 60 EGR engine applications requiring a BA-921 40-tooth air brake compressor with external oil line. The compressor supplies compressed air for the vehicle air brake system and is typically replaced when air output is reduced, leakage is present, or internal compressor wear affects system recharge.
CROSS-REFERENCE(S):
046255012533X, 165-179-9212, 1651799212, N13AC, BAR5012533, BC1-25566, EX5012533X, H5011427X, H5012533X, HVG5012533X, MID5012533X, OR1624, R9555012533X
A cross-reference listing means this part may be a suitable replacement for the listed part numbers. Always verify fitment before installation.
IMPORTANT INSTALLATION NOTES:
✔ Maintain minimum 1.5 GPM coolant flow
✔ Ensure the external oil supply line is connected before startup
✔ Verify air, coolant and oil fittings are properly sealed before startup
✔ Drain all air reservoirs before servicing air brake components
✔ Inspect or replace the discharge line from the compressor head before installation
✔ Avoid sharp bends, restrictions or damaged air lines
✔ Confirm compatibility with the specific C15/C18 engine casting and mounting before installation
✔ Torque cylinder head fasteners to 265–292 in-lb
✔ Torque governor adapter fasteners to 195–213 in-lb
✔ Torque rear end cover fasteners to 195–213 in-lb
✔ Torque inlet port fitting (M27 × 2) to 991–1089 in-lb
✔ Torque discharge port fitting (M22 × 1.5) to 814–912 in-lb
✔ Torque water port fitting (M18 × 1.5) to 593–637 in-lb
✔ Torque oil port (7/16-16 UNF) to 150–170 in-lb
✔ Tighten unloader port (1/8-27 NPT) 2–3 turns from finger tight
SOLD AS REMANUFACTURED – CORE RETURN REQUIRED
Built to OEM standards — thoroughly cleaned, inspected, and tested to ensure durability, performance, and reliability in demanding applications.
Warranty Information
