Genuine EUI Fuel C9 Injector 557-7633 For CAT C9 Engine

Buy CAT C9 fuel injector 557-7633 compatible with C9 engines and HEUI pumps. Fits CAT 330D, 336D, 966H, and more. Widely used in the USA, Middle East, Africa, and Southeast Asia.

 

 

The CAT C9 Injector 557-7633 is a genuine EUI (Electronic Unit Injector), designed specifically for Caterpillar C9 engines. Engineered for precise fuel delivery, this unit combines mechanical and electronic technologies to provide optimal engine performance, fuel efficiency, and emissions compliance.

This injector is a key component in Caterpillar's HEUI (Hydraulic Electronic Unit Injector) system, where engine oil pressure-rather than a conventional fuel rail-is used to actuate the injector's internal mechanism. The 557-7633 injector ensures reliable operation in a wide range of heavy-duty applications including construction equipment, off-highway trucks, and power generation.

 

 

• OEM Part Number: CAT 557-7633
• Fuel System Type: HEUI
• Engine Compatibility: Caterpillar C9
• Injector Type: EUI, electronically controlled and hydraulically actuated
• Build Quality: Manufactured to Caterpillar's high precision and durability standards
• Installation: Direct-fit replacement for C9 injectors in compatible equipment

 

 

The CAT 557-7633 injector requires a compatible HEUI (actuation oil) pump to function correctly. The following actuation pumps are widely matched with this injector:

Pump Part Number	Description
239-4908	Standard HEUI Actuation Pump
10R-3263	Remanufactured Genuine CAT Pump
20R-8046	Complete Reman Pump Assembly
249-0709	Occasionally used in early models

These pumps supply the high-pressure engine oil needed to trigger the fuel injection mechanism in the HEUI system.

 

 

• Caterpillar C9 engine
• Tier 3 / Stage IIIA compliant
• EUI fuel system (not compatible with common rail systems)

 

 

The 557-7633 injector is used in various CAT equipment across multiple industries:

Equipment Type	Common Models
Excavators	CAT 330D, 336D, 329D, 325D
Motor Graders	CAT 140K, 140M, 140H
Wheel Loaders	CAT 966H, 972H, 950H
Dozers	CAT D6R, D6T, D7R
Articulated Trucks	CAT 730, 740, 725
Generators	CAT C9 diesel generator sets
Other Uses	Drill rigs, firefighting units, oilfield equipment

 

 

The CAT 557-7633 injector is in high demand globally due to the wide use of C9 ACERT engines. Key markets include:

• United States – Used in heavy-duty fleets and power generation
• Saudi Arabia & GCC – Common in construction and energy sectors
• India – Demand in mining and industrial applications
• Nigeria – Preferred in oil & gas support and quarry equipment
• Philippines / 🇮🇩 Indonesia – Widely used in civil engineering machinery
• Egypt / 🇿🇦 South Africa – Popular in infrastructure and mining
• Russia – Utilized in off-road and pipeline construction projects

 

 

• Condition: New or Remanufactured (as specified)
• Packaging: Sealed in OEM-grade moisture-proof box

 

 

✅ Other Compatible C9 Injector Models

No.	Injector Part Number	No.	Injector Part Number	No.	Injector Part Number
1	235-5261	21	267-9717	41	387-9439
2	236-0957	22	267-9722	42	553-2592
3	238-8092	23	293-4071	43	557-7634
4	242-0857	24	387-9434	44	20R-8068
5	245-3516	25	20R-8063	45	20R-8062
6	387-9438	26	328-2576	46	20R-8061
7	10R-9002	27	293-4072	47	557-7637
8	20R-8060	28	293-4073	48	573-4231
9	265-8106	29	387-9432	49	577-7633
10	254-4330	30	293-4074	50	10R-2828
11	254-4339	31	328-2574	51	10R-4844
12	254-4340	32	387-9436	52	20R-8846
13	266-4446	33	10R-4764	53	10R-7221
14	267-3360	34	20R-8065	54	10R-7222
15	267-3361	35	328-2573	55	10R-7223
16	267-9710	36	328-2580	56	11R-1582
17	267-9717	37	387-9431	57	20R-1917
18	267-9722	38	387-9433	58	20R-8064
19	293-4071	39	387-9437	59	20R-8968
20	387-9434	40	387-9439	60	20R-9433

These injectors are suitable for various versions of the Caterpillar C9 engine, including models used in construction machinery, industrial power units, and marine engines.

 

 

✅ Other Compatible C9 Actuating Pump Models

No.	Actuating Pump Part Number
1	254-4358
2	304-0678
3	312-0678
4	476-8765
5	384-0678
6	476-8769
7	20R-1636

These actuating pumps (also known as HEUI high-pressure oil pumps) work in tandem with C9 injectors to deliver precise fuel injection performance under high-load conditions.

 

 

 

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