9Y-4004 9Y4004 Engine Piston Assembly for 3406B 3406C 578 621E 621F Construction Machinery
The 9Y-4004 Engine Piston Assembly is a heavy-duty replacement engine component designed for 3406B and 3406C diesel engines, with applications including 578, 621E and 621F construction machinery. Manufactured for demanding diesel engine operating conditions, this piston is designed to provide ...
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The 9Y-4004 Engine Piston Assembly is a heavy-duty replacement engine component designed for 3406B and 3406C diesel engines, with applications including 578, 621E and 621F construction machinery.
Manufactured for demanding diesel engine operating conditions, this piston is designed to provide reliable compression, efficient power transfer and stable performance under high temperature and heavy-load operation. Precision-machined surfaces and a robust piston structure help deliver dependable fitment, wear resistance and long service life.
The JISION 9Y4004 piston assembly is suitable for engine repair, overhaul and replacement applications in construction and heavy equipment.
Product Specifications
| Item | Details |
|---|---|
| Product Name | Engine Piston Assembly / Piston AS |
| Part Number | 9Y-4004 / 9Y4004 |
| Engine Model | 3406B / 3406C |
| Compatible Equipment | 578 / 621E / 621F |
| Application | Diesel Engine / Construction Machinery |
| Product Category | Engine Parts |
| Material | Heavy-Duty Metal Alloy |
| Condition | New |
| Installation | Replacement Type |
| Brand | JISION |
| Supply Type | Wholesale / B2B / Replacement Parts |
Key Features
- Heavy-Duty Construction – Designed for high-load diesel engine applications.
- High Temperature Resistance – Suitable for demanding combustion and operating conditions.
- Excellent Wear Resistance – Durable construction helps reduce wear during long-term engine operation.
- Precision Machining – Accurately machined surfaces help provide proper fitment and stable operation.
- Reliable Compression Performance – Designed to support effective combustion and engine power output.
- Durable Piston Skirt – Provides stable movement inside the cylinder during operation.
- Precision Pin Bore – Helps ensure accurate connection with compatible piston pin and connecting rod components.
- Long Service Life – Built for construction machinery operating under demanding working conditions.
Compatible Engines & Equipment
The 9Y-4004 / 9Y4004 piston is designed for applications including:
Engine Models: 3406B / 3406C
Machine Models: 578 / 621E / 621F
It is suitable for construction machinery, earthmoving equipment and other heavy-duty diesel engine applications using the corresponding piston specification.
Typical Applications
This piston assembly can be used for:
- Diesel engine overhaul
- Engine rebuilding
- Damaged piston replacement
- Construction machinery maintenance
- Heavy equipment engine repair
Why Choose JISION?
JISION supplies a wide range of engine and replacement parts for excavators, wheel loaders, dozers and other construction machinery.
Our product range includes pistons, piston rings, cylinder liners, cylinder heads, water pumps, oil pumps, fuel system parts, turbochargers, starter motors, alternators and other diesel engine components.
We provide professional part-number matching, competitive wholesale pricing, stable parts supply, quality inspection before shipment, export-standard packaging and worldwide B2B shipping support.
Compatibility Notice
Before ordering, please confirm the 9Y-4004 / 9Y4004 part number, engine model, machine model and piston dimensions.
For accurate matching, please provide your engine model, machine model, serial number, old piston part number or product photos before placing an order.
Meta Description
Buy 9Y-4004 9Y4004 engine piston assembly for 3406B 3406C diesel engines and 578 621E 621F construction machinery. Durable JISION replacement engine piston for heavy equipment.
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