DK487009-0400 PISTON KOMATSU

The DK487009-0400 PISTON KOMATSU is a compressor-side engine part used in Komatsu air-compressor assemblies. Public parts references identify this number as a piston, while multiple compressor parts-book listings place it inside Komatsu air-compressor assemblies rather than main power-cylinder groups. Public listings also connect the part with S6D105 and S6D110 family applications, and some seller pages associate it with machines such as PW100-1, WA320-1, and WA420-1.

The uploaded images show that DK4870090400 Piston Komatsu is supplied as a compact piston kit with the piston body, piston pin, and retaining clips. That visual layout matches the way compressor pistons are usually serviced: the piston body handles compression movement, the pin joins the piston to the connecting rod, and the clips lock the pin in place to prevent side travel during repeated cycles.

When buyers search for DK487009-0400 PISTON KOMATSU, they are usually looking for a replacement that restores compressor efficiency, reduces blow-by, and helps maintain stable compressed-air generation for machine support systems. Public parts-book style references show DK487009-0400 working together with matching items such as piston ring kit DK487099-5820, connecting rod DK487013-0920, and piston pin DK487012-0400 in Komatsu compressor assemblies.

What the DK487009-0400 PISTON KOMATSU Does

The main job of the DK487009-0400 PISTON KOMATSU is to convert the crankshaft-driven movement of the compressor into a controlled reciprocating action inside the compressor cylinder. That movement draws air in, compresses it, and supports the machine’s compressed-air circuit. In practical field terms, this means the piston is one of the key wear parts behind reliable air production, stable compressor output, and consistent system response during heavy-duty machine operation. Public compressor catalogs place this part squarely inside Komatsu air-compressor assemblies for S6D105 and related applications.

Because the DK4870090400 Piston Komatsu works under constant heat, pressure, and cyclic loading, it must keep its shape, skirt stability, pin fit, and ring support geometry over long service intervals. A weak or poorly machined piston can lead to air leakage, ring instability, uneven wear, or reduced compressor performance. That is why buyers searching for DK487009-0400 PISTON KOMATSU usually pay close attention to machining quality, pin-bore accuracy, and the finish of the ring-groove area.

Visual Construction and Functional Design

Based on the uploaded images, the DK487009-0400 PISTON KOMATSU has the compact proportions expected from a compressor piston rather than a large combustion piston. The piston crown is flat and cleanly machined, the body includes a transverse wrist-pin bore, and the inner cavity is reinforced for controlled strength without unnecessary mass. The set also includes the pin and two circlips, which is important for service convenience and installation completeness.

This construction matters because compressor pistons live in a very demanding balance zone. They must be light enough to move quickly and repeatedly, but also rigid enough to resist deformation under heat and pressure. The visible machining on the uploaded part suggests a focus on consistent fit, smooth motion, and controlled sealing support. For buyers comparing options, that makes the DK4870090400 Piston Komatsu a part where precision matters more than cosmetic appearance.

Why Compressor Piston Quality Matters

A compressor may be smaller than the main engine, but its role in heavy equipment is still critical. If the compressor loses efficiency, the machine can suffer from reduced air generation, slower pneumatic response, and more frequent service interruptions. That is why the DK487009-0400 PISTON KOMATSU should not be treated as a minor spare. In the right assembly, it is a direct contributor to compressor performance and system stability.

Public references show this piston appearing in the same component family as compressor crankshaft, conrod, ring kit, and head components, which confirms that DK487009-0400 PISTON KOMATSU belongs to a complete internal compressor repair path rather than being a random stand-alone metal part.

A good replacement piston helps protect the cylinder wall, supports proper ring control, and maintains efficient compression. In workshop terms, that means better sealing, smoother motion, and more predictable service life. A bad piston does the opposite: it can accelerate wear, increase friction, and undermine the whole compressor rebuild.

Compatible Komatsu Models and Engine Families

Public online sources do not all present compatibility in the same way. Some list engines, some list compressor assemblies, and some list machine models. Because of that, the safest approach is to confirm by part number and serial number before purchase. Based on the available public references, the DK487009-0400 PISTON KOMATSU is associated with the following Komatsu applications:

• PW100-1
• WA320-1
• WA420-1
• 6D105 family compressor applications
• S6D105 family compressor applications
• S6D110 family compressor applications
• SA6D110 family compressor applications
• Some public cross-reference listings also mention 4D130-related compatibility

The strongest public evidence places DK4870090400 Piston Komatsu in compressor listings for S6D105-1G, 6D105-1F/S6D105-1F family applications, S6D110-1A, and PW100-1. Seller pages additionally connect the same piston with WA320-1 and WA420-1. Because these sources mix engine-based and machine-based references, buyers should still verify with machine serial number, compressor model, and any existing casting or service records before ordering.

Common Service Situations

Most buyers replace the DK487009-0400 PISTON KOMATSU during one of three situations. The first is a compressor rebuild after wear is discovered during inspection. The second is a preventive replacement when rings, pin, and associated internal parts are already being changed. The third is a performance-driven repair, where poor compressor output or air-system inconsistency leads technicians back to the internal piston group.

In those cases, the piston is rarely checked alone. Good workshop practice is to inspect the ring condition, cylinder bore surface, pin fit, connecting rod small-end condition, and compressor head or valve components at the same time. Public compressor parts listings that group DK487009-0400 with ring kits, connecting rod assemblies, and other internal items support that service logic.

Technical Details of DK4870090400 Piston Komatsu

The public web data for this part is limited, but the available references and the uploaded images support the following practical specification profile for DK487009-0400 PISTON KOMATSU:

Product Type

Air-compressor piston for Komatsu applications.

Part Number Formats

DK487009-0400
DK4870090400
Legacy/superseded reference: DK87009-040 on some Komatsu web pages.

Likely Application Group

Komatsu compressor assemblies used with S6D105 / S6D110 family engines and selected related machine applications.

Included Visible Components

• Piston body
• Piston pin
• Retaining clips

Functional Role

Provides the reciprocating compression action inside the air compressor.

Installation Note

The DK487009-0400 PISTON KOMATSU should be installed only after checking piston-to-cylinder condition, ring fit, and pin retention alignment. Even a correct piston cannot perform properly inside a worn or out-of-round compressor bore.

Weight in KG

Public listings are not fully consistent. One aftermarket listing gives the weight as 0.18 kg, while multiple catalog-style compressor listings show 0.22 kg. For catalog and shipping planning, the most honest presentation is:

Estimated weight: 0.20 kg
Observed public range: 0.18-0.22 kg

Why Buy from 3GEN Export

At 3GEN Export, we supply the DK487009-0400 PISTON KOMATSU as an OEM-supply solution for buyers who need dependable heavy-machinery spare parts without long sourcing delays. Instead of vague catalog matching, professional buyers usually want clear part-number handling, practical fitment support, and fast global logistics. That is exactly where 3GEN Export adds value.

When you order DK4870090400 Piston Komatsu from 3GEN Export, you are working with a supplier focused on heavy-equipment parts, clear communication, and worldwide delivery in 5 working days. For fleet owners, repair shops, resellers, and project-based procurement teams, that speed matters just as much as part accuracy. A compressor repair often becomes urgent very quickly, and delayed supply can keep a machine parked longer than necessary.

Final Evaluation

The DK487009-0400 PISTON KOMATSU is a small part with a very important job. Public references place it in Komatsu air-compressor assemblies, especially around S6D105 and S6D110 family applications, and machine-linked seller pages connect it with models such as PW100-1, WA320-1, and WA420-1. The uploaded images confirm the part is presented as a service-ready piston kit with its pin and retaining clips, making it suitable for practical compressor repair work.

For buyers who need a dependable source, 3GEN Export supplies the DK487009-0400 PISTON KOMATSU as an OEM supplier with worldwide delivery in 5 working days. When matched correctly by part number and application, this piston helps restore compressor efficiency, protect internal compressor components, and support consistent machine operation.

Manufactured in Turkey, these products are made using the latest technologies and built to meet the highest international standards. Each machine is a high-quality copy of the original, ensuring durability, precision, and performance that you can rely on for modern construction and metalworking projects.