23B-15-12740 PISTON KOMATSU

The 23B-15-12740 PISTON KOMATSU is a transmission clutch piston used in Komatsu grader driveline assemblies, and public parts catalogs identify the same item under both 23B-15-12740 and 23B1512740. Multiple catalog sources describe it specifically as PISTON,HIGH, which places it in the high-clutch side of the low/high clutch transmission group rather than in an engine piston or hydraulic cylinder application.

That distinction is important for buyers. When someone searches 23B1512740 or 23B-15-12740 PISTON KOMATSU, they are usually looking for a grader transmission component that works inside the clutch housing and cooperates with discs, plates, springs, and seal rings. A public transmission breakdown shows 23B-15-12740 listed directly with clutch discs, plates, springs, pins, and the neighboring low piston, which confirms that this is a clutch-apply transmission part rather than a loose spacer or decorative ring.

From the uploaded images, the part appears as a precision-machined annular piston with a wide dish-shaped working face, a central opening, and evenly spaced mounting ears around the perimeter. That geometry fits the behavior expected from a transmission piston: it is designed to sit accurately within a clutch housing, move axially under pressure, and distribute force evenly across a clutch pack. The shape in your images matches that function very well.

What the 23B-15-12740 PISTON KOMATSU does

In practical workshop language, the 23B-15-12740 PISTON KOMATSU is the component that helps apply clutch force inside the grader transmission. The surrounding catalog references matter here: the same assembly view that lists this piston also lists clutch disc 23S-15-12740, plate 238-15-12810, spring 702-16-11182, and related locating hardware. That combination strongly indicates that the piston’s job is to convert hydraulic pressure into axial clamping force for the high-clutch section.

When this type of piston is working correctly, the transmission can engage the clutch pack with consistent pressure and maintain stable power transfer through the grader drivetrain. When it is worn, scored, distorted, or poorly matched, transmission response may become less precise. That part of the description is a mechanical inference based on the confirmed clutch-group placement of the part and on standard clutch-piston operating principles.

For that reason, 23B-15-12740 PISTON KOMATSU should be treated as a functional powertrain part, not as a generic machined ring. Surface finish, dimensional accuracy, sealing-face quality, and proper alignment inside the housing all matter. On working graders, a mismatch in this area can turn a normal service job into repeated downtime, especially in road building, quarry support, mine maintenance, and large grading operations where the transmission is under regular load.

Visual analysis of the uploaded part

The images show a broad circular piston body with a tapered or dished working section, a machined inner bore, and multiple outer tabs containing bolt or locating holes. The visible surfaces appear turned and ground rather than rough-cast, which is exactly what a transmission piston needs when it must move cleanly and maintain stable contact inside a clutch housing.

Another useful detail is the difference between the two visible faces. One side appears more recessed and dish-shaped, while the reverse side shows more distinct stepped rings and a flatter support profile. That kind of face variation makes sense on a clutch piston because one side typically works with pressure and seal geometry while the other side works with housing support and movement control. Even without a factory drawing, the uploaded images strongly support the interpretation of this part as a pressure-applied transmission piston.

Because buyers often search by number rather than by part type, the listing should intentionally use both number styles throughout the page: 23B-15-12740 and 23B1512740. That improves discoverability for both exact-match catalog searches and broader commercial searches such as Komatsu grader transmission piston, high clutch piston, or transmission clutch apply piston.

Where the 23B-15-12740 PISTON KOMATSU sits in the transmission

One of the most useful public references for this part is the transmission housing breakdown that lists both 23B-15-12750 PISTON,LOW and 23B-15-12740 PISTON,HIGH in the same low/high clutch group. In that same listing, the high piston appears directly before the high clutch disc and plate components, which helps confirm its position and function inside the powertrain assembly.

That catalog relationship is valuable for SEO and for customer trust. It allows you to describe the 23B-15-12740 PISTON KOMATSU as a grader transmission high-clutch piston, not just as a “piston” without context. It also helps buyers compare it against neighboring parts such as 23B-15-12750, 23S-15-12740, and 238-15-12810 when they are rebuilding or diagnosing the low/high clutch section.

Compatible Komatsu models for 23B-15-12740 PISTON KOMATSU

The strongest catalog evidence ties 23B-15-12740 PISTON KOMATSU to Komatsu grader families in the low/high clutch transmission group. Public catalog snippets consistently connect the part to these core models and serial ranges: GD605A-5S S/N 4001-UP, GD605A-5 S/N 1001-UP, GD611A-1 S/N 10001-UP, GD621A-1 S/N 10001-UP, GD621R-1 S/N 10001-UP, GD623A-1 S/N 30001-UP, GD625A-1 including North America serial listings, and GD661A-1 S/N 10001-UP.

Additional cross-reference and catalog-index snippets also associate this number with older or adjacent grader families such as GD511A-1, GD521A-1, GD525A-1, and GD663A-2, while some broader marketplace catalog pages mention even wider grader families. Because those extended references are often pulled from cross-links rather than a single clean factory page, the safest commercial wording is to present them as secondary references and recommend serial-number confirmation before purchase.

Commonly referenced Komatsu applications

• GD605A-5S

• GD605A-5

• GD611A-1

• GD621A-1

• GD621R-1

• GD623A-1

• GD625A-1

• GD661A-1

• GD663A-2 (commonly cross-referenced, verify by serial)

Older or broader cross-reference mentions seen in catalog indexes

• GD511A-1

• GD521A-1

• GD525A-1

Technical details and specifications

Part identification

• Product name: 23B-15-12740 PISTON KOMATSU

• Alternate number format: 23B1512740

• Catalog naming: PISTON,HIGH

• Equipment type: Komatsu graders

• Assembly location: Transmission, low and high clutch group

Functional description

• Transmission clutch piston for the high-clutch section

• Works with clutch disc 23S-15-12740

• Works with clutch plate 238-15-12810

• Used together with springs, pins, dowels, bolts, and seal rings in the same clutch housing

Construction characteristics based on the uploaded images

• Machined metal annular body

• Central bore for housed transmission fitment

• Broad dished piston face

• Outer locating or fastening tabs

• Stepped sealing and contact surfaces

Approximate weight

A public seller listing publishes the 23B-15-12740 PISTON KOMATSU at approximately 5.20 kg. I would treat that as a practical listing weight rather than an engineering-certified mass and recommend confirming the exact warehouse weight before you use it for final freight quoting or dimensional shipping calculators.

Why buyers search for 23B-15-12740 PISTON KOMATSU

Most buyers searching 23B-15-12740 PISTON KOMATSU are not browsing casually. They usually already have the transmission open, the parts book in hand, or an inspection report pointing to the low/high clutch section. In those moments, they want three things immediately: exact number recognition, understandable application language, and confidence that the replacement part belongs in the correct clutch group.

That is why a good product page should say more than “piston.” It should clearly explain that 23B-15-12740 PISTON KOMATSU is the high clutch transmission piston used in Komatsu graders, that it appears in the low/high clutch assembly with matching discs and plates, and that it is offered by 3GEN Export as an OEM supplier for customers who need reliable international sourcing and fast dispatch. The public catalog structure makes that kind of positioning accurate and commercially strong.

Website-ready commercial description

23B-15-12740 PISTON KOMATSU for grader transmission clutch systems

The 23B-15-12740 PISTON KOMATSU is a precision-machined transmission clutch piston developed for Komatsu grader applications in the low/high clutch assembly. Public parts references identify this number as PISTON,HIGH and place it directly alongside clutch discs, clutch plates, springs, and seal components within the transmission housing. That makes it a critical part for customers rebuilding, servicing, or replacing components in the grader drivetrain.

From the uploaded images, the 23B-15-12740 PISTON KOMATSU shows the exact kind of engineered geometry expected from a housed clutch-apply piston: a wide annular body, carefully machined contact faces, a central bore, and evenly spaced outer mounting ears. This design supports controlled axial movement and balanced force distribution inside the transmission clutch group, helping maintain stable engagement performance in working graders.

At 3GEN Export, we supply 23B-15-12740 PISTON KOMATSU as an OEM supplier for buyers who need dependable replacement parts for Komatsu grader powertrain service. Whether your maintenance team searches the code as 23B-15-12740 or 23B1512740, this product page is built to make identification easier, reduce sourcing errors, and support faster decision-making for workshops, fleets, resellers, and contractors.

The 23B-15-12740 PISTON KOMATSU is most strongly associated with GD605A-5S, GD605A-5, GD611A-1, GD621A-1, GD621R-1, GD623A-1, GD625A-1, and GD661A-1 graders, with additional cross-reference mentions for GD663A-2 and selected earlier grader families. Because Komatsu grader applications can vary by serial range and market version, the best practice is to confirm the machine serial before ordering.

Why choose this part from 3GEN Export

• OEM supplier support

• Worldwide delivery in 5 working days

• Clear part-number matching for 23B-15-12740 and 23B1512740

• Suitable for grader transmission clutch rebuild work

• Practical sourcing option for fleet maintenance and export markets

Applications and maintenance value

The 23B-15-12740 PISTON KOMATSU is especially relevant in transmission overhaul work, clutch-pack repair, grader fleet preventive maintenance, and urgent export replacement orders. Because it belongs inside the low/high clutch group, it is often purchased together with related friction and sealing components rather than as an isolated item. The public assembly references showing the piston together with clutch disc 23S-15-12740 and plate 238-15-12810 support that purchasing pattern.

For large contractors and equipment managers, that matters financially. A transmission job usually carries higher labor cost and longer downtime than a simple bolt-on replacement. Listing the 23B-15-12740 PISTON KOMATSU with clear fitment language, related assembly context, and fast international supply messaging makes the product page more useful to serious industrial buyers who need confidence before they place an order.

Final summary

The 23B-15-12740 PISTON KOMATSU, also searched as 23B1512740, is best understood as a Komatsu grader high-clutch transmission piston. Public catalog and assembly sources place it in the transmission low/high clutch group together with matching discs, plates, springs, and seals. The clearest model associations include GD605A-5S, GD605A-5, GD611A-1, GD621A-1, GD621R-1, GD623A-1, GD625A-1, and GD661A-1, with cross-reference mentions for GD663A-2 and selected older grader families. A seller listing publishes the weight at approximately 6 kg, and your uploaded images support the identification of the part as a precision-machined annular clutch piston. At 3GEN Export, this is exactly the kind of component that fits a professional OEM supplier offer with worldwide delivery in 5 working days.

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.