Description

Takeuchi TB125 Parts Catalog – OEM Factory Parts Manual for Compact Excavator

You have a Takeuchi TB125 compact excavator on your lot, and the undercarriage is shot. Or maybe the hydraulic piping is leaking, and you need the correct O-ring kit. Without the factory parts catalog, you’re guessing – and guessing costs you time and money when the wrong part shows up. I’ve seen guys order a carrier roller for a TB125 with serial number 12513452 and end up with the earlier version that doesn’t fit. That’s a wasted afternoon and a restocking fee. This Takeuchi TB125 Parts Catalog – 493 pages of OEM exploded diagrams and part numbers – is the only way to get it right the first time. It’s the same book the dealer uses, and it’s not some aftermarket reprint with blurry lines.

493 Pages of Exploded Views and Part Numbers

This catalog is not a service manual – it’s a parts manual. That means every section breaks down the machine into its individual components with callouts pointing to each part number. The UNDERCARRIAGE section alone covers the lower frame, crawler belt (with and without rubber pads), carrier roller split by serial number (12510009-12513451 and 12513452-), track roller, front idler, track adjuster, travel device, slew bearing, swivel joint, dozer blade, and lower piping. Page 1 shows the index, so you can jump straight to the assembly you need without flipping through 400 pages of Japanese text. The HOE ATTACHMENT section includes the boom, arm, telescopic arm (split into 1/2 and 2/2), and multiple bucket options – including a bucket for U.S.A. models. You get the exact part number for the bucket teeth, pins, and bushings.

How Do You Read the Takeuchi Parts Manual?

Takeuchi includes a detailed “How to read the parts manual” section starting on page 2. It explains the RESEARCH SYSTEM (English, French, German, Japanese) and how to interpret the part numbers, quantities, and compatibility notes. For example, an asterisk (*) after a part name means that component is part of a larger assembly, and you need to order the parent assembly if the asterisked part isn’t sold separately. The manual also covers machine orientation – right and left are defined from the operator’s seat facing forward. That’s critical when ordering the track adjuster or swing pedal. Page 5 shows the English version of the ordering instructions. If you skip reading that page, you’ll likely order the wrong side of a control lever – and then you’ll be stuck with a part that doesn’t fit because the ISO-JCB pattern differs from the A-B pattern. The catalog lists those variations explicitly.

Serial Number Split Sections: Get the Right Part

Takeuchi built the TB125 over multiple production ranges, and the parts changed. This catalog documents every split. For example, the SWIVEL JOINT & ACCESSORIES has two sections: one for serial numbers 12510009-12514525, another for 12514526-. The ENGINE & ACCESSORIES is split into 1/2 and 2/2 for both ranges. The ELECTRICAL section has variations for 12510009-12510038, 12510039-12514525, and 12514526- – plus a separate section for KOSRAN electrical components. If you order a battery for serial number 12510010 without checking the split, you might get the wrong terminal layout. The CAB MOUNT splits at 12513337. The HEATER for cab models splits at 12510422 and 12514526. This level of detail is why aftermarket parts catalogs are a liability – they don’t track these splits, and you end up with a part that was superseded three revisions ago.

Electrical and Hydraulic Diagrams: OEM Accuracy

The HYDRAULIC PIPING & TANK section includes upper piping split into 1/2 and 2/2 across three serial number ranges, plus accumulator, emergency shut-off valve, and pump drive sections. The ENGINE & ELECTRICAL SYSTEM covers the control boxes (R.H. and L.H.), engine control, decel unit, travel alarm, cab working light, radio, and beacon socket. If you need the exact part number for the DECEL. UNIT for a machine built after 12514526, you’ll find it in that specific section. The COVER & CAB section includes canopy variants (4-pole and 2-pole) and cab versions with detailed breakdowns of the door, front sash, and seat. The DECAL & TOOL section lists the decal kits for canopy and cab, including a separate kit for Japan models. That matters if you’re restoring a machine and need the correct safety decals.

Stick with Factory Data – Avoid Aftermarket Headaches

I’ve had more than one apprentice bring me a part from a third-party supplier that looked right but had a different bolt pattern. The aftermarket catalogs often compress multiple revisions into one diagram, and you can’t tell if the part you’re ordering is for a TB125 with a 2-pole canopy or a 4-pole cab. This OEM catalog gives you the exact part number, quantity, and compatibility notes (the AR notation for as-required parts, and the 中 and 下 symbols for interchangeability). If you’re serious about keeping your TB125 running, you need the factory book. The same applies to the Automotive Industry Overview – but that’s a general reference, not a manual. For your Takeuchi, stick with the OEM parts catalog.

FAQ

Can I use this parts catalog to find torque specs for the track adjuster?

No. This is a parts catalog, not a service manual. It lists part numbers and exploded views, not torque values. For torque specs, you need the factory service manual, which you can find in the related manuals below.

Does the catalog include part numbers for the electrical harnesses?

Yes. The ELECTRICAL sections (1/2, 2/2) contain detailed harness diagrams with part numbers for each connector, wire, and component. The sections are split by serial number ranges, so you can order the correct harness for your machine’s production date. The RADIO and WINDOW WASHER sections are also included.

Related Manuals

• Takeuchi TB125, TB135, TB145 Workshop Manual – OEM Factory Specs
• Takeuchi TB125 Parts Catalog – OEM Factory Specs for Compact Excavator
• Takeuchi TB125, TB135, TB145 User Manual – OEM Operator’s Guide

Access the Factory Manual now and stop relying on blurry third-party diagrams. The TB125 is a solid machine, but it deserves the right parts. Click the button to get the OEM PDF – 493 pages, no guesswork, no surprises.

Automotive Industry Overview Automotive Industry Overview