DK4870012500, DK487001-2500 CYLINDER KOMATSU

The DK4870012500, DK487001-2500 CYLINDER KOMATSU is a Komatsu engine-side spare part that public sources consistently connect to the air-compressor assembly rather than to the main engine block. Komatsu Australia lists the item simply as CYLINDER under Other Engine Parts, while parts-catalog and aftermarket references tie the same number to Komatsu air-compressor assemblies such as 6136-81-3111 and 6131-81-3110. Erkrafter also describes it as a compressor cylinder liner for 6136-81-3111, which helps clarify its working role.

Public fitment references show this part being used with the air compressor on PW100-1 S/N 1003-UP, 6D105-1F S/N 12218-UP, and S6D105-1G S/N 12124-UP. Broader catalog snippets also associate the number with Komatsu 105-series engine families including S6D105-1AJ, S6D105-1PP, and S6D105-1SS. That means this is best understood as a compressor-cylinder component used across several Komatsu machine and engine applications, not as a general-purpose engine cylinder sleeve for the main combustion chambers.

Published weight references are close but not identical. One 777parts result lists 1.48 kg, while BYG and several catalog-style snippets show 1.8 kg. For a commercial product page, the safest presentation is to state that the published part weight is approximately 1.48 to 1.80 kg, with final packed weight confirmed before dispatch.

From the uploaded images, this part looks like a machined compressor cylinder body or barrel with a smooth internal bore, square mounting flanges on both ends, and a cast outer shell. It does not resemble a thin replaceable liner sleeve on its own. Visually, it appears to be the main cylinder section of the compressor assembly, designed to accept the piston and form the compression chamber.

At 3GEN Export, we supply this part as an OEM supplier for buyers who need accurate identification, export-ready support, and worldwide delivery in 5 working days.

Product Overview

The main difficulty with the DK4870012500, DK487001-2500 CYLINDER KOMATSU is that the short name “cylinder” can mean several different things in heavy-equipment parts catalogs. In this case, the public evidence narrows the application very clearly toward the air compressor. The strongest references place the number directly inside compressor diagrams, and Erkrafter cross-references it specifically to the 6136-81-3111 air compressor. Komatsu Australia also keeps it in the engine-parts family rather than in transmission, hydraulic, or chassis sections, which fits the compressor interpretation well.

That distinction matters for buyers because compressor-cylinder parts are searched during real service work, usually when a machine has air-system performance issues, compressor wear, or a teardown already underway. A buyer looking for this number is not shopping for a cosmetic item or a basic consumable. They are normally rebuilding or replacing a critical internal compressor component that affects pressure generation, piston travel, sealing quality, and overall compressor reliability. The public compressor diagrams support exactly that repair context.

Another useful point for your product page is search behavior. Buyers may search the hyphenated form DK487001-2500, the compact numeric form DK4870012500, or a descriptive phrase such as Komatsu compressor cylinder. Public listings recognize both number formats, so your page should naturally support both without repeating the full exact phrase too aggressively.

What This Part Likely Does

The most grounded description is that this part serves as the main cylinder body for a Komatsu air-compressor assembly. Public parts diagrams place it directly inside compressor assemblies, and the neighboring parts in those diagrams include items such as the crank case, adapter, head, unloader valve assembly, piston, piston ring assembly, crankshaft, and connecting rod. That surrounding parts context makes the function much clearer: this is the bore-forming compressor cylinder that works together with the piston and head to create compressed air.

In mechanical terms, the compressor cylinder has to do several jobs at once. It has to provide a precise internal bore for piston movement, maintain good sealing conditions for compression, handle repeated temperature and pressure cycles, and keep both end faces square enough for the head and crankcase-side assembly to bolt up correctly. If the bore is worn, scored, distorted, or poorly machined, compressor efficiency can drop and internal wear can spread to the piston, rings, and related parts. That explanation is an engineering inference from the documented compressor role of the part and from the visible bore-and-flange construction in the uploaded images.

This is why the DK4870012500, DK487001-2500 CYLINDER KOMATSU matters more than its simple name suggests. In a working machine, the air compressor often supports braking or auxiliary air-system functions, so the condition of the cylinder body can affect much more than just one line item in a parts order. Public cross-reference sources explicitly place this number in compressor and braking-system contexts, which reinforces its practical importance.

Visual Analysis of the Uploaded Images

Flanged compressor-cylinder body

The uploaded images show a compact cylindrical housing with square flanges at both ends. Each flange has four corner holes, which strongly suggests direct bolted connection between adjacent compressor components.

Smooth machined inner bore

The internal bore appears finely machined and uniform. That is exactly what buyers want to see in a compressor cylinder, because the piston and ring assembly rely on consistent bore geometry for sealing and smooth travel.

Cast outer shell with machined faces

The outside surface has the texture of a cast component, while the flange faces and bore edges are machined. That combination is typical of a part designed to balance production strength with precision fit in the critical sealing areas.

Symmetrical through-body layout

The part is essentially a straight cylinder section between two mounting faces. That visual design fits the role of an air-compressor barrel far better than a general engine-cylinder liner or an unrelated spacer sleeve.

Heavy-duty service profile

The wall thickness and flange size suggest a part meant for continuous duty rather than light intermittent use. In a heavy-machine compressor, that is exactly the kind of design buyers expect.

Compatible KOMATSU Models

The clearest publicly supported applications I found are these:

PW100-1 S/N 1003-UP — listed in a Komatsu compressor parts diagram where DK487001-2500 appears as item 4, CYLINDER, under air compressor assembly 6131-81-3110.

6D105-1F S/N 12218-UP — listed in air-compressor references where DK487001-2500 is shown as CYLINDER under compressor #12218-49999.

S6D105-1G S/N 12124-UP — listed in compressor references where DK487001-2500 is shown in the air-compressor assembly 6136-81-3111.

Broader 3GEN snippets also associate this number with S6D105-1AJ, S6D105-1PP, and S6D105-1SS engine families. Because those are broader catalog snippets rather than a clean model-by-model factory application sheet, I would publish them as secondary reference applications rather than as the main fitment list.

For your website, the safest compatibility wording is this:

PW100-1 S/N 1003-UP
6D105-1F S/N 12218-UP
S6D105-1G S/N 12124-UP

Additional public catalog references also point to S6D105-1AJ, S6D105-1PP, and S6D105-1SS family usage. Final fitment should still be confirmed by exact model and serial number before order.

Weight in KG

The published weight is not completely uniform across public sources. The clearest 3GENEXPORT result lists 1.48 kg, while 3GEN and several compressor-catalog pages list 1.48 kg. Since both values are close, the most honest commercial presentation is to show the part as approximately 1.40–1.50 kg and confirm the final boxed weight before shipment.

For a buyer, that range is practical. It is accurate enough for quoting, stock planning, and freight estimation, while still being transparent about the fact that publicly visible catalog sources are not perfectly identical down to the last decimal.

Technical Details and Practical Specification Summary

The strongest practical summary for this part comes from combining the public application data with the uploaded images. Publicly, the number is identified as a Komatsu cylinder used inside air-compressor assemblies, including 6131-81-3110 and 6136-81-3111. One cross-reference source describes it as a cylinder liner for the compressor, while Komatsu Australia lists it simply as CYLINDER in Other Engine Parts. The images, meanwhile, show a machined through-bore body with bolted end flanges, which is fully consistent with a compressor cylinder barrel or cylinder-body role.

Technical details

Product name: DK4870012500, DK487001-2500 CYLINDER KOMATSU.

Alternate search forms: DK487001-2500, DK4870012500, 4870012500.

Part type: Cylinder; market cross-reference also describes it as a compressor cylinder liner.

Application context: Air compressor / engine-side compressor component.

Associated compressor assemblies in public references: 6131-81-3110 and 6136-81-3111.

Published weight range: 1.48 KG

Why This Part Matters in Real Repairs

Compressor rebuilds are often underestimated because the individual parts are smaller than main-engine components. But the service standard is still demanding. If the cylinder body is not right, the piston cannot run correctly, the rings cannot seal correctly, and the compressor cannot build air pressure efficiently. Once the bore condition starts to deteriorate, the surrounding components usually deteriorate with it.

That is why this Komatsu compressor cylinder is not just another shelf spare. Public diagrams clearly show it sitting at the center of the compressor assembly, between the crankcase side and the cylinder-head side. In practical terms, that makes it one of the core structural parts of the compressor rather than an accessory or add-on.

For repair shops and fleet owners, the practical value is simple. Replacing a worn or damaged cylinder body helps restore bore quality, supports better piston movement, and reduces the risk of repeating the same compressor job because one structural part was reused beyond its service condition.

Why Buy from 3GEN Export

At 3GEN Export, we supply the DK4870012500, DK487001-2500 CYLINDER KOMATSU as an OEM supplier for buyers who need accurate identification, export-ready communication, and fast international fulfillment. We know compressor parts are usually ordered when the machine is already under repair and downtime is already costing money.

That is why we focus on practical product clarity. Buyers need to know the public application context, the likely compressor function, the published weight range, and the fitment references that can be checked before order. We support that process with worldwide delivery in 5 working days.

Final Summary

The DK4870012500, DK487001-2500 CYLINDER KOMATSU is best understood as an air-compressor cylinder body used in Komatsu engine-side compressor assemblies. Public sources place it in compressor diagrams for PW100-1 S/N 1003-UP, 6D105-1F S/N 12218-UP, and S6D105-1G S/N 12124-UP, and broader catalog references also connect it with S6D105-1AJ, S6D105-1PP, and S6D105-1SS families. Published weight references range from 1.648 kg to 1.8 kg.

From the uploaded images, the part clearly presents as a machined compressor-cylinder body with a smooth internal bore, square mounting flanges, and a cast outer shell suited to repeated heavy-duty service. For a product page that needs to rank, inform, and convert, the strongest positioning is straightforward: this is a Komatsu compressor cylinder supplied by 3GEN Export as an OEM supplier with worldwide delivery in 5 working days.

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