23A7015140, 23A-70-15140 SHAFT KOMATSU

The 23A7015140, 23A-70-15140 SHAFT KOMATSU is a motor grader drive component used in the circle reverse gear section of Komatsu machines. Public catalog references place this part in the circle reverse gear assembly, and one serial-specific catalog page shows it on the GD305A-1A S/N 6734-UP layout. That tells buyers immediately that this is not a general-purpose shaft. It belongs to a precise work-equipment drive system where alignment, spline accuracy, and flange fit matter to circle drive performance.

From the uploaded images, the part has the visual profile of a heavy splined shaft with a flanged mounting face, stepped bearing or seating surfaces, and a machined end section prepared for controlled torque transfer. The geometry strongly matches a circle reverse drive application: a splined upper section for engagement, a wide flange for secure mounting, and a shaft body with multiple diameter transitions that suggest guided rotation inside a supported housing.

For buyers sourcing grader transmission and circle-drive parts, this matters because a shaft like this is rarely ordered casually. It is typically replaced during major repair work, circle reverse service, or rebuild planning when the machine is already down and correct fitment is essential. Public listings also show this number under both forms, 23A-70-15140 and 23A7015140, so using both on the page is important for search visibility and procurement accuracy.

At 3GEN Export, we present this part as an OEM supplier solution for professional buyers who need dependable sourcing and worldwide delivery in 5 working days.

Product Overview

Public parts references identify this number simply as a shaft, but the catalog unit description gives the more useful clue: it belongs to the circle reverse gear group. That placement is more important than the short part name because it explains where the component actually works. Instead of sitting in an engine or axle assembly, it functions in the grader work-equipment drive system that controls circle movement and directional transfer through the reverse gear arrangement.

The 23A7015140, 23A-70-15140 SHAFT KOMATSU is therefore best understood as a circle reverse drive shaft for Komatsu graders. The images support that reading. The splined end is designed for positive mechanical engagement, the round flange distributes mounting load across multiple fastener points, and the stepped shaft body suggests a component that must rotate precisely while remaining supported and centered under working loads.

This kind of part is important because circle drive accuracy affects blade control, grading consistency, and general machine responsiveness. When the shaft in a reverse or circle-drive section becomes worn, misfit, or damaged, the operator can feel the difference in backlash, inconsistent movement, or reduced control quality. That is why serious buyers tend to match this part by number, model family, assembly group, and visual comparison instead of by name alone.

What This Shaft Does in the Machine

A grader’s circle system is fundamental to blade positioning and angle control. Public catalog pages link this shaft to the circle reverse gear assembly, meaning it works in the mechanism that transfers rotational force inside the grader’s circle drive arrangement. That function makes it a working drive element, not a passive support part.

In practical workshop terms, a part like this helps deliver torque through the reverse gear or circle drive section so the machine can control blade-circle movement accurately. The spline section is especially important because it indicates that the shaft is intended to mate securely with another internally splined or geared component. A keyed or loose-fit arrangement would look very different. Here, the design suggests controlled engagement under load, which is exactly what a grader’s circle reverse system requires.

The flange is equally telling. A wide circular flange with multiple mounting holes usually means the shaft is meant to be fixed into a housing or support structure with repeatable positioning. That helps preserve alignment and resist shifting under torque. In a circle reverse assembly, even a small deviation in fit or mounting quality can influence wear patterns and long-term performance.

Because this component works in a movement-control system rather than as a cosmetic or static part, material quality and machining accuracy matter. The uploaded photos show consistent turning marks, clean diameter transitions, and sharply formed splines. Those visible details align with the expectations for a high-duty motor grader shaft.

Visual Analysis of the Uploaded Images

The uploaded images provide strong product-page value because they show the exact structure buyers expect to confirm before ordering.

Splined drive section

The upper end of the part shows a long external spline profile with evenly spaced teeth. That shape is one of the clearest indicators that this shaft is designed for torque transfer rather than simple support. The splines appear deep and consistent, which is important for load sharing and precise engagement.

Stepped shaft body

The main body has multiple machined diameters and shoulders. In mechanical terms, that usually means the shaft is designed to interface with bearings, seals, supports, or housings at specific locations. The presence of these shoulders suggests controlled positioning inside an assembly rather than free unsupported rotation.

Flanged mounting face

The circular flange includes multiple bolt holes spaced evenly around the perimeter. This is a strong sign of fixed mounting into a grader work-equipment housing. The flange also adds rigidity, which helps the shaft maintain its correct installed position while transmitting force.

Machined finishing and symmetry

The visible machining quality supports the idea that this is a precision-fitted component. The shaft appears balanced and deliberately manufactured for exact alignment. On heavy equipment, that is important because poor machining tolerance can quickly lead to vibration, wear, or shortened service life.

Compatible KOMATSU Models

Public sources connect this part number with a broad Komatsu grader family. The strongest family-level catalog snippets associate it with GD305A, GD355A, GD405A, GD505A, GD510R, GD511A, GD521A, GD525A, GD605A, GD611A, GD621A, GD621R, GD623A, GD625A, GD661A, and GD663A graders.

A serial-specific catalog page confirms this shaft in the circle reverse gear section for GD305A-1A S/N 6734-UP. Aftermarket fitment listings also expand the application into detailed model variants including GD305A-1, GD305A-1A, GD305A-3, GD355A-1, GD355A-1S, GD355A-3, GD405A-2, GD405A-2S, GD405A-3, GD405A-3S, GD505A-3, GD505A-3A, GD510R-1, GD511A-1, GD521A-1, GD521A-1E, GD523A-1, GD525A-1, GD605A-5, GD605A-5S, GD611A-1, GD621A-1, GD621R-1, GD623A-1, GD625A-1, GD661A-1, and GD663A-2. Because those detailed variants come from aftermarket compatibility pages rather than a single factory parts book, they are best treated as practical cross-reference guidance and checked against serial number before purchase.

For your product page, the cleanest model list is this:

• Komatsu GD305A

• Komatsu GD355A

• Komatsu GD405A

• Komatsu GD505A

• Komatsu GD510R

• Komatsu GD511A

• Komatsu GD521A

• Komatsu GD525A

• Komatsu GD605A

• Komatsu GD611A

• Komatsu GD621A

• Komatsu GD621R

• Komatsu GD623A

• Komatsu GD625A

• Komatsu GD661A

• Komatsu GD663A

This is a good place to remind buyers that serial verification is still the safest final step. Motor grader parts in circle drive and reverse gear assemblies can look similar across generations, so exact model and serial confirmation reduces mismatch risk.

Weight of the Part

Public sources do not show a single perfectly identical weight figure. One Komatsu parts catalog listing gives 9.932 kg, while another public catalog entry gives 9.767 kg. These are close enough to treat the component as an approximately 9.8 to 9.9 kg shaft for quoting and planning purposes.

For your website, the safest wording is:

Approximate weight: 9.8–9.9 kg

That wording is strong because it reflects the public catalog range honestly rather than pretending there is one universally fixed published value. It also helps buyers estimate shipping and handling more accurately.

Technical Details and Specifications

The most reliable specification-style summary for this item, based on the uploaded images and public catalog references, looks like this:

Product identification

• Product name: 23A7015140, 23A-70-15140 SHAFT KOMATSU

• Alternate search forms: 23A7015140, 23A-70-15140, 23A 70 15140

• Part type: shaft

• Assembly group: circle reverse gear

• Machine type: Komatsu motor grader

Physical profile from the uploaded images

• External splined drive end

• Stepped machined shaft body

• Circular flange with multiple mounting holes

• Precision-machined cylindrical surfaces

• Heavy-duty drive component form factor

Reference weight

• 9.767 kg in one public catalog listing

• 9.932 kg in another public catalog listing

• Practical website value: approximately 9.8–9.9 kg

Application notes

• Used in the circle reverse gear section

• Connected with Komatsu motor grader families from GD305A through GD663A in public cross-references

• Best ordered with model and serial confirmation

Why This Part Matters in Real Repair Work

A shaft in the circle reverse system matters because it sits in a drive path that directly affects grader blade-circle movement. When this kind of part wears, the issue is not just theoretical. It can influence how the machine responds during circle positioning, how evenly drive load is transferred, and how long related mating parts continue to perform correctly.

In real service environments, graders work on roads, construction platforms, maintenance corridors, quarry routes, and earthmoving sites where operators depend on precise moldboard control. Circle-drive components are repeatedly loaded, repositioned, and exposed to vibration and contamination. A weak or inaccurate shaft in that system does not merely shorten its own life. It can also affect bearings, housings, gears, or mating splined components around it.

That is why buyers should see the 23A7015140, 23A-70-15140 SHAFT KOMATSU as a high-value repair part rather than a simple cylinder of metal. Its importance comes from where it works. A machine can continue to earn only when control systems respond correctly, and this shaft belongs to one of those systems.

Buying Tips Before Ordering

Match the number both ways

Many buyers search with hyphens, while others search without them. Supporting both 23A-70-15140 and 23A7015140 on the same product page improves discoverability and makes the page more useful for procurement teams working from different documents.

Confirm the assembly section

This part is associated with the circle reverse gear section, not a general transmission group or random chassis location. That makes the unit description especially important during ordering because nearby components in a grader can have similar naming but different working positions.

Verify machine model and serial

Public references show wide family coverage, but one of the clearest exact catalog references is GD305A-1A S/N 6734-UP. Detailed variant lists from aftermarket suppliers broaden the application range, but final confirmation should still be done against the machine serial number.

Compare with the removed part

The uploaded photos help with bench-side verification. A technician can compare spline length, flange hole count, shaft diameter transitions, and general geometry before ordering. That visual check is often one of the best safeguards against returns or downtime caused by a mismatch.

Why Buy from 3GEN Export

At 3GEN Export, we supply the 23A7015140, 23A-70-15140 SHAFT KOMATSU as an OEM supplier for professional heavy machinery buyers who need reliability, export support, and speed. We understand that grader parts are often ordered under pressure. The machine may be waiting in the yard, the repair window may be short, and the buyer usually needs confidence as much as price.

That is why we focus on clear product identification, real application guidance, and worldwide delivery in 5 working days. For distributors, fleet operators, workshops, and machinery resellers, that makes the sourcing process easier and more predictable.

A strong product page should do the same. It should help the buyer understand what the part is, where it belongs, and why it matters. That is the role this listing is designed to serve.

Final Summary

The 23A7015140, 23A-70-15140 SHAFT KOMATSU is a flanged splined shaft used in the circle reverse gear section of Komatsu motor graders. Public sources connect it with a broad model family that includes GD305A, GD355A, GD405A, GD505A, GD510R, GD511A, GD521A, GD525A, GD605A, GD611A, GD621A, GD621R, GD623A, GD625A, GD661A, and GD663A, while a serial-specific catalog page confirms it on GD305A-1A S/N 6734-UP. Public catalog weight references place it at roughly 9.8 to 9.9 kg.

From the uploaded images, the part shows the exact features buyers expect in a heavy grader drive shaft: a long external spline, a precision-machined body, and a multi-bolt flange for secure mounting. For websites targeting serious spare-parts traffic, this is a strong item because the search intent is highly specific and tied directly to active repair work.

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.