23B1512780, 23B-15-12780 PISTON KOMATSU

The 23B1512780, 23B-15-12780 PISTON KOMATSU is a transmission-side piston used in Komatsu motor grader applications. The strongest public parts references connect this exact number to the transmission (2nd clutch) group, where it appears as an analog on serial-specific grader catalog pages. Public seller catalogs also list the same number as a Komatsu grader piston in transmission-and-torque parts categories.

From the uploaded images, this part has the visual profile of a compact clutch piston or clutch-application ring component rather than an engine piston. It is a short annular body with a splined internal bore, a thick outer wall, and evenly spaced external drive lugs around the circumference. That geometry matches the kind of part buyers expect to see in an internal clutch assembly where controlled axial movement, positive engagement, and dimensional accuracy matter more than raw external size.

For workshops and fleet operators, that distinction is important. A second-clutch piston is not a cosmetic spare part and not a general hydraulic ram. It belongs to a compact internal transmission group where pressure, clutch plates, seal rings, and mating steel components work together. When a piston in that section wears, binds, cracks, or loses fit, the result can show up as poor engagement quality, unstable clutch response, added internal heat, or premature wear on neighboring parts. That functional explanation is a mechanical inference supported by the part’s documented placement in the second-clutch transmission group.

At 3GEN Export, we supply this part as an OEM supplier for heavy-machinery buyers who need reliable fitment support, clear communication, and worldwide delivery in 5 working days.

Product Overview

The most useful clue about the 23B1512780, 23B-15-12780 PISTON KOMATSU is where public catalogs place it. A 777parts page for GD625A-1 S/N 60001-UP shows the part as an analog in the transmission (2nd clutch) section, and similar 777parts catalog snippets do the same for GD605A-5 S/N 1001-UP and GD661A-1 S/N 10001-10631. That means the part belongs to a clutch-related internal transmission assembly rather than to an exterior housing or general driveline bracket.

Public marketplace and seller sources reinforce that reading. MTK Makina lists the same number as a piston Komatsu grader under transmission-and-torque parts, while other public parts directories list 23B-15-12780 simply as a Komatsu piston in the same transmission-family range. Those seller references are less specific than the serial-based catalog pages, but they support the same commercial identity: this is a grader transmission piston, not a random round insert.

That matters because the word “piston” alone can be misleading in heavy machinery. Komatsu graders contain several kinds of pistons across engines, hydraulics, and transmission assemblies. The public evidence for this number points to the transmission side, specifically the second-clutch group, which is exactly the kind of context serious buyers need before ordering.

What This Piston Does

A piston in the second-clutch section converts internal hydraulic pressure into controlled axial force inside the clutch pack. Public sources do not spell out a full engineering explanation, but the fact that 23B1512780 is tied to transmission (2nd clutch) pages is enough to establish the part’s role inside a clutch-application assembly. In practical terms, that means it helps apply or release internal clutch elements so the transmission can transfer torque in the intended operating condition.

In workshop language, this is the kind of part that has to move correctly, seal correctly, and hold its shape under repeated hydraulic loading. If it does not, the problem rarely stays confined to one component. Clutch plates may wear unevenly, engagement can become less stable, and the transmission may begin to show harsher or less predictable behavior. Those consequences are a practical inference from the part’s clutch-group location and from how similar internal clutch pistons work in oil-fed grader transmissions.

This is also why buyers usually search for this part during real repair work. Public seller pages classify it under transmission-and-torque parts rather than general inventory groupings, and a public procurement record for GD655A-5includes 23B-15-12780 among other transmission clutch components such as carriers, rings, discs, and plates. That strongly suggests real-world use during transmission overhaul or clutch service rather than casual shelf stocking.

Visual Analysis of the Uploaded Images

The uploaded images help explain why this is a clutch-side transmission part.

Compact annular body

This is not shaped like a combustion piston. The body is short, ring-like, and thick, which fits an internal transmission or clutch application much better than an engine cylinder role.

Internal spline bore

The inner diameter shows clear spline engagement. That means the part is designed to work positively with a mating splined component rather than float loosely on a plain surface.

External drive lugs

The outer circumference has evenly spaced engagement lobes. Those features indicate that the part is meant to interact mechanically with surrounding transmission hardware, not simply sit as a passive washer or spacer.

Heavy-section construction

The wall thickness and balanced symmetry suggest a part designed for load-bearing service inside a compact driveline group. That is exactly what buyers expect from a second-clutch piston or related transmission-apply member.

Compatible KOMATSU Models

The strongest public model references I found for the 23B1512780, 23B-15-12780 PISTON KOMATSU are tied to serial-specific transmission catalog pages.

Confirmed public associations include:

Komatsu GD605A-5 S/N 1001-UP, where the number appears as an analog on the transmission (2nd clutch) page.

Komatsu GD625A-1 S/N 60001-UP for North America, where the same number appears as an analog on the transmission (2nd clutch) page.

Komatsu GD661A-1 S/N 10001-10631, where the same number is shown as an analog on the transmission (2nd clutch)page beside the description PISTON,2ND.

There is also a public procurement listing for GD655A-5 that includes 23B-15-12780 together with other transmission clutch parts, which supports real use on that grader family as well, although that source is a tender-style parts list rather than a factory-style catalog page.

Public seller catalogs additionally market the exact number more broadly as a Komatsu grader piston in transmission-and-torque parts categories, but those listings do not always expose model-level detail on the snippet view. Because of that, the safest fitment wording for your website is this: the part is publicly tied most clearly to GD605A-5, GD625A-1, and GD661A-1 second-clutch applications, with additional public evidence pointing to GD655A-5, and serial verification recommended before order.

Weight in KG

I could not verify a trustworthy exact catalog weight for this exact part number from the public sources I found. The available public references for 23B-15-12780 identify the part and its application, but they do not expose a reliable numeric weight in the search snippets.

For planning purposes only, similar neighboring Komatsu transmission pistons in the same general family are publicly listed in the low-single-digit kilogram range: 23B-15-12771 is shown at 2.63 kg on UCASLAR, and 23B1512760 is listed at approximately 2.78 kg on a 3GEN Export product page. Based on those adjacent-family references and the visible size of this part, a cautious working estimate is that the 23B1512780, 23B-15-12780 PISTON KOMATSU is likely in roughly the 2.6–3.0 kg range, but I would not present that as a confirmed exact catalog weight.

For your product page, the safest wording is:

Weight: exact public catalog weight not verified; planning estimate approximately 2.6–3.0 kg, confirm packed weight before dispatch.

Technical Details and Product Summary

The strongest practical specification summary for this item, based on the uploaded images and public references, is this:

Product name: 23B1512780, 23B-15-12780 PISTON KOMATSU.

Alternate search forms: 23B1512780, 23B-15-12780, 23B 15 12780.

Part type: transmission piston for Komatsu grader applications.

Public assembly association: transmission (2nd clutch); one catalog snippet explicitly shows the related description PISTON,2ND alongside this number as an analog.

Machine category: Komatsu motor grader transmission and torque parts.

Visual construction from the uploaded images: compact annular body, internal spline bore, external engagement lugs, heavy-section cylindrical wall, and balanced clutch-style geometry.

Why This Part Matters in Real Repairs

Transmission repairs are expensive because the real cost is never only the part. The real cost is workshop time, machine downtime, teardown labor, and the risk of having to open the transmission again. That is why the 23B1512780, 23B-15-12780 PISTON KOMATSU matters so much when a grader is already under repair. Public catalog evidence ties it to the second-clutch section, which is exactly the kind of internal group where one weak component can affect the performance of several others.

In field use, graders do not work under gentle conditions. They see repeated load transitions, shifting traction, long operating hours, and constant need for predictable driveline behavior. A clutch-side piston in that environment has to apply evenly, seal correctly, and remain dimensionally stable. If it does not, the transmission may still move, but it may no longer move well. That is why experienced buyers treat this kind of item as a core repair component rather than a minor detail. The public second-clutch placement is the factual anchor for that conclusion.

Buying Guidance Before Ordering

The first rule is to match both number styles. Buyers search 23B1512780 and 23B-15-12780 in different systems, and public sources recognize both formats for the same Komatsu piston.

The second rule is to confirm the assembly section. This is not just “a piston.” Public evidence ties it to the transmission (2nd clutch) group, and that group context matters just as much as the part number itself.

The third rule is to confirm the machine model and serial number. The strongest public associations are GD605A-5, GD625A-1, and GD661A-1 in serial-based second-clutch listings, with additional public evidence for GD655A-5 through a procurement record.

The fourth rule is to compare the removed component visually. The uploaded images make it easy to check the ring body, internal spline pattern, outer drive-lug profile, and overall thickness against the workshop part before ordering.

Why Buy from 3GEN Export

At 3GEN Export, we supply the 23B1512780, 23B-15-12780 PISTON KOMATSU as an OEM supplier for buyers who need clear identification, export-ready support, and fast delivery. We understand that internal transmission parts are rarely ordered in relaxed conditions. Usually the machine is already down, the repair team is already waiting, and the buyer needs confidence as much as price.

That is why we focus on practical support, application-aware communication, and worldwide delivery in 5 working days. For distributors, fleet operators, rebuild shops, and machinery resellers, that means less uncertainty and a faster move from diagnosis to installation.

Final Summary

The 23B1512780, 23B-15-12780 PISTON KOMATSU is best understood as a second-clutch transmission piston for Komatsu graders. Public sources tie the exact number most clearly to GD605A-5, GD625A-1, and GD661A-1 second-clutch pages, while additional public evidence also points to GD655A-5 through a transmission-parts procurement record. Public seller listings consistently categorize the number as a Komatsu grader piston in transmission-and-torque parts.

From the uploaded images, the part clearly presents as a compact annular clutch piston with internal splines, external engagement lugs, and a heavy-section ring body. For a product page that needs to rank, inform, and convert, the strongest positioning is clear: this is a Komatsu transmission piston supplied by 3GEN Export as an OEM supplier with worldwide delivery in 5 working days.

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