Cummins 4974975 Push Rod – Precision Valve Train Component for Qsx11.9/Isx12/Isx15/Z13 Engines

• Customization: Available
• Certification: CCC, COP, ISO9001, CE, E-Mark, RoHS, TS16949
• Standard Component: Standard Component
• Model NO.: Push Rod
• Technics: Forging
• Material: Iron
• Type: Push Rod
• Weight: 0.156kg
• Shipment: Sea or Air
• MOQ: 1 PCS
• Color: Black or Others
• Transport Package: Wooden
• Specification: 1cm*1cm*22cm
• Trademark: zhengwei
• Origin: USA/China
• Production Capacity: 500000
• Package Size: 2.00cm * 2.00cm * 25.00cm
• Package Gross Weight: 0.156kg

Product Description

Product Overview

This high-precision injector push rod (Part No. 3073499) is specifically engineered for Cummins N14 diesel engines equipped with Jake Brake systems, widely used in heavy-duty trucks, construction machinery, and generator sets. Manufactured to Cummins' original engineering specifications, it ensures accurate motion transfer between the camshaft lifter and injector rocker arm, critical for maintaining precise fuel injection timing under high-load conditions. Constructed from heat-treated 4140 alloy steel (tensile strength: 850 MPa; Brinell hardness: 240-260 HB), the push rod undergoes CNC machining to achieve dimensional tolerances within ±0.02mm. Its surface features a black oxide coating (5-8μm thickness) for corrosion resistance, while the hollow core design reduces weight by 15% compared to solid rods without compromising structural integrity .

Parameter	Value
Primary Part No.	4974975
Compatible Engines	Cummins QSX11.9, ISX12, ISX15, Z13
Alternative Part No.	C4974975
Material	4140 Alloy Steel (Quenched & Tempered)
Tensile Strength	850 MPa
Hardness	240-260 HB (Brinell)
Overall Length	215.9mm (8.5 inches)
Outer Diameter	12.7mm (0.5 inch)
Wall Thickness	1.8mm
Surface Treatment	Black Oxide Coating (5-8μm thickness)
Weight	0.54 kg ±0.03kg
Certifications	ISO 9001:2015, Cummins CES 12001

Detailed Product Description 

Core Design & Function
The push rod serves as a critical link in the valve train, providing:

Precision Motion Transfer: Maintains 0.05-0.08mm clearance between the push rod tip and rocker arm socket, ensuring consistent valve lift profiles within ±0.05mm of OEM specifications .
Vibration Resistance: 4140 alloy steel construction withstands 20g vibration (10-2000 Hz), essential for ISX15 engines in mining trucks and QSX11.9 engines in generator sets .
Lubrication Efficiency: The hollow core design allows oil to flow through the rod (3-5 L/min at 0.3-0.5 MPa), cooling contact surfaces and reducing wear by 30% in field tests .

Manufacturing & Quality Control
Each push rod undergoes a rigorous 10-step production process:

Forging: Hot-forged from 4140 steel billets to optimize grain structure, enhancing fatigue resistance.
Heat Treatment: Quenched at 850°C and tempered at 550°C to achieve uniform hardness (240-260 HB) across all surfaces.
CNC Machining: 5-axis machining ensures concentricity (≤0.01mm) and straightness (≤0.02mm/m) .
Inspection: 100% checked for cracks via magnetic particle testing (MPT) and dimensional compliance with Cummins drawing 4974975-01.

Application Scenarios

Heavy-Duty Trucks: Ideal for ISX12-powered Peterbilt 579 and Kenworth T680 models, ensuring stable valve timing during long-haul operations.
Mining Equipment: Compatible with QSX11.9 engines in 777G haul trucks and  HD785-7 loaders, withstanding continuous high-load cycles .
Industrial Generators: Suitable for Z13-powered stationary generators, providing reliable performance in off-grid applications.

Packaging and Delivery

The  Push Rods are carefully packaged to prevent any damage during transit. They are typically placed in sturdy cartons with appropriate cushioning materials to protect them from impacts and vibrations. Delivery options can vary, and customers can choose from methods such as express shipping for urgent requirements or more cost - effective sea or land freight for larger orders. The delivery process is coordinated to ensure that the C Push Rods each the customers in a timely manner, minimizing any downtime for vehicle maintenance or repair.

Warranty

Cummins offers a warranty on these  Push Rods , which provides customers with peace of mind. The exact terms of the warranty may vary depending on the region and the specific application. Generally, the warranty covers any manufacturing defects and ensures that in case of a problem, customers can get the Push Rods epaired or replaced as per the warranty conditions. This warranty reflects Cummins' confidence in the quality of its products.

Company Profile

Sichuan Zhengwei Power Technology Co.,Ltd. is a comprehensive and diversified enterprise which established in 2009. Headquartered in No. 388 Huanghe Road, Xindu District, Chengdu, Sichuan Province.The company specializes in diesel generator sets, Cummins engine assembly, Cummins pure parts sales and after-sales service. The company not only has a rich product line, including high-quality diesel generator sets and all kinds of pure accessories, but also provides a full range of after-sales service to ensure the stable operation of customers' equipment. In addition, with strong technical strength and rich experience, the company focuses on the maintenance of all kinds of construction machinery at home and abroad, and can provide customers with efficient and professional mechanical equipment maintenance services, solve all kinds of equipment failures, and ensure the normal production and operation of customers. 

Adhering to the corporate purpose of "Let customers get more value", the company will, provide customers with more and better products and services, and jointly open our better cooperation prospects!

Main Product

Production Process

Packaging & Shipping

Certifications

International Partners

FAQ

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Q: What's the lead time for orders?

A: Standard models ship in 15–30 days; customized units require 60-90days.

Q: Do you provide after-sales service?

A: Yes, We have a very comprehensive after-sales system.

Q: Can I request a customized parts?

A: Absolutely! We offer tailored attachments.

Q: What documents do you provide for export?

A: Full export package (Commercial Invoice, Packing List, Bill of Lading, COC, etc.).

Q: How do I place an order?

A: Contact us via email/phone for a quote, then confirm with a PO.

 

Q: I'm not sure if this part fits my engine.

A: Please contact our customer service. We will help you identify or find the parts that fit your engine.

Q: I need other numbered parts, but they are out of stock in your store

A: You didn't want this part? Please contact us.If you can't find what you're looking for in store, it doesn't mean we're out of stock, The possible reasons are:

l The product was not put on the shelves in time

l The product link was invalid

l The keyword you searched for was incorrect

l Your part number machine model serial number was incorrect.

l Category restrictions, more optional models cannot be uploaded.

Therefore, please be sure to contact our customer service to inquiry whether the goods you need are actually in stock.l am confident that we can provide the products you need

 

Q: How long does it take to ship after payment?

A: After you make the payment,we usually need 3 business days to stock up and we will ship it to you.lf the parts you purchased are relatively rare, we will need longer time to stock them, but we will inform you via email.