Description
BA-921 CAT COMPRESSOR CLOSED ROOM HEAD (3126/C7/C9 INDUSTRIAL)
PART NUMBER(S):
Fleet Products: K193205X (Remanufactured) | OE (Caterpillar): 385-0938, 351-7083 Bendix: K058843, K066828, K046449, K066808 John Deere: DZ118218
DESCRIPTION:
Model: BA-921 Closed Room Head (6-Bolt Aluminum Head)
Vehicles: Caterpillar 3126, C7, C9 Industrial Applications, Excavators, John Deere
• Type: Single-stage, reciprocating piston
• Series: BA-921
• Operation: Engine driven
• Mounting: Side mount, 2-bolt flange
• Cooling: Air/Water cooled (water-cooled configuration)
• 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)
• Minimum Coolant Flow @ Max RPM: 1.5 gpm
• Minimum Oil Pressure: 15 PSI
• Governor Cut-Out (min): 120 PSI
• Unloader Line: 3/16 in ID
• Temperature Range: 170°F inlet / 400°F discharge
• Air Inlet Location: Top
• Safety Valve Port Diameter: M16 x 1.5
• Cylinder Head (M8) Torque: 265–292 in-lb
• Governor Adapter (M8) Torque: 195–213 in-lb
• Rear End Cover (M10) Torque: 195–213 in-lb
• Inlet Port Fitting (M27x2) Torque: 991–1089 in-lb
• Discharge Port Fitting (M22x1.5) Torque: 814–912 in-lb
• Water Port Fitting (M18x1.5) Torque: 593–637 in-lb
• Oil Port (7/16-16 UNF) Torque: 150–170 in-lb
• Unloader Port (1/8-27 NPT): 2–3 turns from finger tight
• Includes: Installation gaskets
Applications: This BA-921 closed room head compressor is used on Caterpillar 3126, C7, and C9 industrial applications with BM gear and 6-bolt head configuration. It is associated with industrial equipment and engine-driven air systems, including Crawler Excavator 322-1994, and is also listed as compatible with DZ118218 applications covering John Deere equipment models 4045CI550, 4045CI551, 4045HF150, 4045HF280, 4045HF285, 4045HF485, 4045HFC04, 4045HFC06, 4045HFC09, 4045HI440, 4045HI550, 4045HI551, 4045TF120, 4045TF150, 4045TF220, 4045TF250, 4045TF270, 4045TF280, 4045TF285, 4045TFC03, 4045TI530, 6068CI550, 6068HF120, 6068HF150, 6068HF250, 6068HF285, 6068HF485, 6068HFC08, 6068HFC09, 6068HFC93, 6068HFC94, 6068HFC95, 6068HFG94, 6068HFS01, 6068HI550, 6068TF120, 6068TF220, and 6068TF250.
Note: We also sell BA-921 closed room compressors with 6-bolt aluminum head configuration as reman and return units for industrial applications, including C13: K045107, K066806, 351-7089, 385-0939, K058841, K066826; C15 & C18: K045108, K066807, 351-7086, 385-0940, K058842, K066827; and C18 (2.8 BM Gear): K055770, K066813, 360-4138, 385-0944, K058844, K066833.
CROSS-REFERENCE(S):
K193205X, DZ118218, K046449, K066808, 351-7083, 385-0938, K058843, K066828, 3850938, (Related 6-Bolt head Part numbers 5011441, 223-3636, 5012510, 5012459, 5014177, 253-1736, 5014180, 5014235, 5014401, 255-4160, 5014402, 5014427, K048938, 353-7136, K048939, K048940, K066811, 385-0936, K066831, K066837, 5011427, 223-3637, 5012531, 5012532, K020283, 304-9991, K020285, K020284, K048941, 353-7137, K048942, K048943, K066812, 385-0937, K066832, K066838, K045107, 351-7089, K066828, K066806, 385-0939, K066826, K045108, 351-7086, K058842, K066807, 385-0940, K066827, K055770, 360-4138, K058844, K066813, 385-0944, K066833, 5011624, 257-9346, 5013063, 5013064, 5011625, 226-9580, 5013070, 5013071, K041109, 3861777C91, K055513, K055514, K041741, 3861778C91, K055603, K055604, 801465, 5012464, 801798, 5014236, 801826, 5014428, K056649, K056647, 801463, 5012533, 801594, 5013058, 801595, 5013059)
Please confirm all ports and dimensions match your application before ordering.
IMPORTANT INSTALLATION NOTES:
✔ Confirm this compressor matches the BA-921 closed room head, BM gear, and 6-bolt head configuration before installation.
✔ Verify all inlet, discharge, water, oil, and unloader port sizes and tighten fittings only to the specified torque values.
✔ Maintain a minimum coolant flow of 1.5 gpm at maximum RPM and ensure minimum oil pressure is at least 15 PSI before operation.
✔ Install using the supplied gaskets and confirm all mounting, air, coolant, and oil connections are sealed correctly before startup.
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
