Description

Takeuchi TB125 Parts Catalog

You’ve got a Takeuchi TB125 on a lift with a blown hydraulic line, and you need the right replacement part before sundown. A dealer won’t pick up, and you’re staring at a serial number plate that’s half-rusted. That’s exactly when a factory Parts Catalog stops being a PDF and starts being the difference between a two-hour job and a two-week chase. I’ve been turning wrenches long enough to know that ordering the wrong part because you guessed the serial number range costs more than just money – it kills a Saturday. This catalog fixes that. No reprints, no aftermarket guesswork. Just the same exploded views and part numbers the dealer uses, in 559 pages.

10 Sections That Cover Your TB125

Flip to the index on page 3 and you’ll see exactly what’s broken down: Undercarriage, Turntable & Control Lever, Engine & Electrical System, Hydraulic Piping & Tank, Cover & Cab, Hoe Attachment, Decal & Tool, Hydraulic Device, and three separate Engine sections for the 3TNE82A-ETB, 3TNE82A-TB, and 3TNV82A-QTB (cab) / QTB1 (canopy). That’s ten identifiable sections, each with its own page block. The catalog doesn’t waste space on procedures – it’s pure part identification, with reference drawings and callouts. If you need the bolt that holds the lower frame cover, page 1-1 under reference E5A012 gives you the part number, quantity, and serial number applicability. No flipping through vague diagrams that could be any model.

Engine Variants by Serial Number Range

Takeuchi used three different engines on the TB125 depending on when it was built. The catalog separates them by serial number range: 3TNE82A-ETB for S/N 12510452 through 12514525, 3TNE82A-TB for S/N 12510009 through 12510451, and 3TNV82A-QTB (cab) / QTB1 (canopy) starting from S/N 12514526. If you try to order a fuel pump for a 3TNE82A-TB and your machine actually has a 3TNV82A, you’re going to be holding the wrong part. The catalog lists each engine’s components separately – pistons, rings, injectors, everything. You need to check your machine’s serial number before you order. That’s not a suggestion; it’s how the factory designed the breakdown.

Lower Frame: An Example of Real-World Use

Look at the first page of the catalog – page 1. You’ll see an exploded view of the lower frame assembly. Part X03510-06000-2 is the frame assembly itself, quantity 1, with a note that it applies across the whole serial number range. But the covers? They split. Cover part 0351006010 fits machines up to S/N 12510152; from 12510153 to 12516859 you get two different covers labeled (H) and (L). After 12516860, back to a single cover. Get that wrong and you’re drilling holes in a part that should bolt on. The catalog tells you exactly when the part number changed. That’s the kind of detail aftermarket catalogs leave out. I’ve seen guys weld brackets because they ordered the wrong cover. Don’t be that guy.

Does the Catalog Include Hydraulic and Electrical Parts?

Yes. Section 8 is Hydraulic Device – piston pumps, control valves, swivel joints. Section 3 covers Engine & Electrical System – includes the starting motor, alternator, wiring harness connectors. If you’re rebuilding a hydraulic circuit or tracing a short, this catalog gives you the factory part numbers for every seal, O-ring, and solenoid. It doesn’t give you repair instructions – that’s what the Takeuchi TB125 TB135 TB145 Workshop Manual is for. But if you need to order a seal kit for the hoe attachment (section 6), you’ll find the part number and the quantity per assembly. Pair this catalog with the workshop manual and you’ve got the whole factory documentation set.

Why Factory OEM Documentation Matters Here

I’ve worked with aftermarket parts catalogs that claim to cover the TB125. They usually combine all serial numbers into one generic list, ignore the mid-range cover changes, and list parts that were superseded ten years ago. This catalog is a direct print from Takeuchi’s OEM files – the same PDF that dealership parts counters use. It’s not a scanned reprint of a reprint; it’s the original factory file with clear references like “E5A012” matching the page layout. When you’re dealing with compact excavator parts that sometimes cost hundreds of dollars, you don’t want to gamble on a third-party interpretation. For context, the Automotive Industry Overview shows just how many variables exist in mechanical assemblies – one wrong digit in a part number can mean a different thread pitch. This catalog eliminates that guesswork.

7 Systems Covered in the Index – And Then Some

The index lists seven main assemblies plus three engine sections – that’s ten functional groups. But within each are sub‑assemblies: the turntable section includes the control lever linkage; the cover & cab section lists decal kits and glass seals. The hoe attachment breaks down into the boom, arm, bucket linkage, and cylinder seals. Each sub‑assembly has its own exploded view with part numbers, quantities, and remarks like “12510009~” meaning the part applies from that serial number onward. If you need a specific o-ring for a hydraulic fitting, you’ll find it in the hydraulic piping section (4) or the device section (8). The catalog doesn’t miss a bolt, washer, or cap – every single component is accounted for. That’s 559 pages of part numbers.

FAQ

How do I know which engine section to use for my TB125?

Check the serial number plate on the engine block. The catalog splits by S/N ranges printed above each engine heading.

Can I use this parts catalog with the TB135 or TB145?

No. The parts listings are specific to the TB125 chassis and its three engine variants. A TB125 uses different swing bearings, undercarriage parts, and hydraulic pumps than the larger models. For the TB135 or TB145, you need the respective factory parts catalog for those models. A related manual set, the Takeuchi TB125, TB135, TB145 User Manual – OEM Operator’s Guide, covers operator procedures but not part numbering. If you’re working on a TB125, this is the correct catalog. If you need the workshop repair procedures, get the Takeuchi TB125 Parts Catalog (that’s this one) alongside the workshop manual. Mixing across model lines will get you the wrong components.

Get the Right Parts – Access the Factory Manual

Every time I pull a part number from a factory catalog, I know it’s correct because the engineers who designed the machine signed off on that PDF. This isn’t a generic parts list thrown together from dealer bins. It’s the same 559-page document that a dealer’s parts counter uses to quote you a price. If you’re rebuilding a TB125, ordering a complete engine gasket set, or sourcing a replacement hydraulic motor, you need the original part numbers. Skip the aftermarket guessing. Access the Factory Manual now and keep it on your tablet next to the machine.