Description

Takeuchi TB125 Parts Catalog

If you’ve ever wasted a Saturday because the parts counter sold you the wrong hydraulic seal or a camshaft gear that didn’t match the spline count, you know exactly why this 597-page Takeuchi TB125 Parts Catalog belongs on your bench. I’ve been turning wrenches for twenty-eight years, and I’ve seen more money burned on cross-referenced aftermarket junk than I care to count. This catalog gives you the exact part numbers, exploded views, and breakdowns that Takeuchi used when the machine left the factory. No translation errors, no “equivalent” that leaves you with a loose bolt. Period.

Undercarriage and Engine & Electrical System Coverage

Open the book and you hit the INDEX first. Then straight into Section 1 UNDERCARRIAGE — rollers, sprockets, idlers, track chains. Section 2 covers the TURNTABLE & CONTROL LEVER assembly. Section 3 is the big one: ENGINE & ELECTRICAL SYSTEM. That’s where the starter motor, generator, wiring harness, and the whole driveline parts live. Want the charge pressure regulator? It’s in there. Need the correct alternator bracket for the 3TNE82A-TB? Page 73 has the exploded diagram. Don’t trust aftermarket diagrams — I’ve seen them swap left and right sides on control lever assemblies. This catalog prints the same view the factory uses.

What Exactly Is in the Engine Parts Section?

This isn’t some generic “engine” chapter. Under TB125 Engine they break out three different engine variants: 3TNE82A-TB, 3TNE82A-ETB, and 3TNV82A-QTB/QTB1. Each one has its own index with seventeen sub-sections. Cylinder block, gear housing, flywheel housing, cylinder head and bonnet, suction manifold, exhaust manifold, camshaft and driving gear, crankshaft and piston, lub oil system, cooling water system, fuel injection pump, governor, injection valve, fuel line, starting motor, generator, and gasket set. If you’re rebuilding the top end of a 3TNE82A-TB, the cylinder head & bonnet section on page 4 of that sub-section shows every valve, spring, and seal. No guessing which gasket set you need — the manual lists the part number right next to the drawing.

597 Pages of OEM Part Numbers

Count them: 597. That’s not 200 pages of fluff with a few photos. Every page is a parts breakdown with callouts, part numbers, and quantity. The back of the book has a Numerical Index (Section 9) so you can look up any part number and find exactly which assembly it belongs to. Need a camshaft for the 3TNV82A-QTB? Flip to Section 7 under that engine variant, compare the exploded view, and order the correct Takeuchi part. No cross-referencing, no calling the dealer on Monday to return the wrong box.

Camshaft & Driving Gear: How the Manual Breaks It Down

Take the camshaft and driving gear assembly for the 3TNE82A-TB. The manual gives you a clean exploded diagram with number callouts. Part numbers are listed below the drawing, along with the quantity per machine and any supersession notes. You’ll see whether the gear is part of the camshaft or separate, and whether there’s a priority part (marked with a star) that Takeuchi recommends using. No aftermarket catalog tells you that — they just show a generic gear and let you hope. If you’ve ever had a cam gear walk off because the press fit wasn’t right, you know exactly why this matters.

Use the Numerical Index to Find Parts Fast

Don’t waste time flipping through sections. The Numerical Index at the end lists every part number in numeric order with the page it appears on. Cross-reference a part number from an old seal, find the page, and confirm the diagram matches your machine’s serial number (S/N 12510009- and up). The book covers serial numbers from that break onward, so if your machine is older, double-check the front pages. Most TB125s you’ll find in San Antonio are within that range, but verify before you order.

Why OEM Documentation Beats Aftermarket Copies

I’ve had guys bring me Chinese reprints of Takeuchi manuals that miss entire sections. The hydraulic piping and tank (Section 4) in the OEM catalog shows the exact hose routing, clamp positions, and fitting torque specs — wait, this is a parts catalog, not a service manual, so torque specs aren’t included. But what you do get is the correct O-ring part number for every hydraulic fitting. Aftermarket copies often blur the drawings or skip the smaller components because they’re hard to scan. This is a direct scan of the original Takeuchi book, Book No. BE5Z004. The first few pages even teach you how to read the parts manual — includes Japanese, English, French, and German instructions. That’s the kind of documentation you want when you’re ordering from a parts counter in another state.

For more specialized references, check the Takeuchi TB125 Parts Catalog”>Takeuchi TB125 Parts Catalog product page for complete ordering details. Pair it with the Takeuchi TB125 TB135 TB145 Workshop Manual”>Takeuchi TB125 TB135 TB145 Workshop Manual if you need labor procedures and torque values. Need a different Takeuchi model? The Takeuchi TL26 Parts Catalog – 288 Page OEM Factory Manual”>Takeuchi TL26 Parts Catalog – 288 Page OEM Factory Manual covers that compact track loader with the same factory accuracy.

For background on heavy equipment manufacturing standards, refer to Automotive Industry Overview. Also check Automotive Industry Overview for context on how these parts catalogs fit into the broader supply chain.

Frequently Asked Questions

Does this catalog include torque specifications for assembly?

No. This is a parts catalog — it lists part numbers, quantities, and exploded diagrams. For torque values and repair procedures, buy the workshop manual specific to your engine variant.

Will this work for a TB125 with serial number 12508000?

Check the first page: the catalog applies to serial number 12510009 and up. Machines with lower numbers may have different part designs. Call Takeuchi with your S/N to confirm compatibility before ordering.

How are the engine sections organized?

Three separate engine variants are covered: 3TNE82A-TB, 3TNE82A-ETB, and 3TNV82A-QTB/QTB1. Each has a complete sub-index with 17 sections from cylinder block through gasket set. The camshaft & driving gear section is clearly marked.

Can I use the Numerical Index to find a part I don’t have a number for?

You’ll need a part number to use the index. Without one, start with the main INDEX page and identify the assembly (e.g., UNDERCARRIAGE) then browse the diagrams until you see the part. The drawings are grouped logically, so it’s not hard to find what you’re looking for even without a number.

Don’t waste another afternoon chasing wrong parts. Access the Factory Manual now and start ordering the right Takeuchi components on the first try.