Product Description
KN7050X EL740 Air Compressor – Haldex Style Replacement for Heavy-Duty Truck Air Brake Systems
The KN7050X EL740 air compressor is a heavy-duty replacement designed for commercial truck air brake systems used on a wide range of medium- and heavy-duty diesel vehicles. This compressor is stocked and ready to ship from Ace Motor Parts. Engine-driven compressors are responsible for supplying the compressed air required for brake actuation, parking brake operation, and other pneumatic systems used in commercial vehicles.
The EL740 compressor design uses a two-cylinder reciprocating piston configuration that produces reliable airflow for fleet vehicles operating under demanding conditions. With a belt-driven pulley system and durable cast housing, the compressor is well suited for trucks that require consistent air system pressure during daily operation.
Vehicle Applications
The KN7050X compressor is commonly used in commercial trucks, semi-tractors, vocational vehicles, and heavy equipment that rely on air brake systems. Applications often include:
- Heavy-duty commercial trucks
- Semi-tractors and highway tractors
- Vocational trucks used in construction and municipal service
- Medium-duty diesel trucks equipped with air brake systems
These compressors are typically installed using a 4-bolt base mounting configuration and operate through a pulley-driven belt system connected to the engine accessory drive.
EL740 Compressor Design
The EL740 compressor platform utilizes a two-cylinder piston design which compresses air in a single-stage process. The compressor features a combination air and water cooling system that helps regulate operating temperatures during continuous use.
The unit uses a left-side air inlet and discharge configuration when viewed from the front of the compressor. This layout is commonly used in commercial truck installations where space around the engine accessory drive is limited.
The compressor housing and internal components are designed for durability in demanding fleet environments where trucks operate for extended periods and require consistent air supply for braking and auxiliary air systems.
Key Features
- Direct replacement for EL740 and KN7050 air compressors
- Heavy-duty two-cylinder reciprocating piston compressor
- 4-hole base mount configuration
- Pulley (belt) driven accessory drive
- Air and water cooled compressor design
- Left-side air inlet and discharge configuration
- Designed for commercial truck air brake systems
- Reliable performance in fleet and vocational vehicles
Technical Specifications
| Part Number | KN7050X |
| Compressor Model | EL740 |
| Compressor Type | Two-Cylinder Reciprocating Piston |
| Mounting Style | 4-Hole Base Mount |
| Drive Type | Pulley / Belt Driven |
| Cooling Method | Air / Water Cooled |
| Air Inlet Location | Left (Viewed From Front) |
| Air Outlet Location | Left Flange (Viewed From Front) |
| Weight | Approximately 32 lbs |
| Typical Use | Heavy-Duty Truck Air Brake Systems |
Navistar OEM Cross Reference
| 398567C91 | 398567C92 | 874706R2 |
| 874706R93 | 874707R93 | 990177C91 |
| 997104R91 | 997109R91 | R9557050 |
CAT OEM Cross Reference
| 623033 | 680620 | 681504 |
GM OEM Cross Reference
| 2397310 | 2428601 | 2435566 |
| 2456774 | 2457495 | 2468827 |
| 2493844 | 2499019 | 3827932 |
| 3876238 | 3957461 | 5106141 |
KN7050X / EL740 Compressor Cross Reference
| E-MDKN7050X | EL7050 | EL740 |
| KN7050 | KN7050N | ZZKN7050X |
Always confirm mounting configuration, pulley alignment, and engine compatibility before ordering.
The Role of the Air Compressor in Truck Brake Systems
The air compressor is a critical component in commercial vehicle braking systems. It continuously generates compressed air which is stored in reservoirs and used when the driver applies the brakes.
If a compressor begins to lose efficiency due to internal wear, the air system may take longer to build pressure. Replacing a worn compressor helps restore proper braking system operation and ensures reliable air supply for both brake actuation and auxiliary air components.
Browse our full inventory of air brake compressors or explore our selection of surplus air brake compressors for heavy duty trucks available from Ace Motor Parts.
