Description

Takeuchi TB108 Parts Catalog – What You Get When the Dealer Says ‘Look It Up Yourself’

You’re in the middle of an engine rebuild on a TB108, and the part you pulled is cracked – wrong piston ring, bad injector line, whatever. The dealer’s phone tree sends you in circles, and aftermarket catalogues give you a part number that might be right if you cross your fingers and hope. That’s where this Takeuchi TB108 Parts Catalog stops the guessing. 217 pages of factory-original part numbers, exploded diagrams, and revision history. I’ve used catalogues like this for twenty-eight years – you don’t buy a part blind when the machine earns your paycheck.

Engine for TB108: Section 10 – 2TNV70-PTB

Page 0 of the index lists eight major groups: Undercarriage, Turntable & Control Lever, Engine & Electrical System, Hydraulic Piping & Tank, Cover & Cab, Hoe Attachment, Decal & Tool, and Hydraulic Device. The engine-specific section (number 10) covers the 2TNV70-PTB power unit. Every component – from the cylinder head gasket to the alternator bracket – is listed with its OEM part number, description, required quantity, and service channel. That last column tells you if the part has superseded revisions. If the serial number range matters (S/N 10820001-), the manual flags it. No more ordering a ported block when you need the plain casting.

Lower Frame Part Numbers: Page 1-1 Reference

Turn to page 1-1 and you get the lower frame breakout: frame assy (X03210-55500-1), right and left frame halves with their own sub-numbers (0321055250, 0321055260), clamp brackets, bolts (M8x16, M8x12), spring washers, and a spanner cylinder. The reference drawing (B5A111) at S=1/9 scale shows exactly where each part lives. If you’ve ever stared at a pile of fasteners and wondered which washer goes where, this kills the guesswork. Each part number connects to an exploded view – that’s the only way to get the order right the first time.

3 Major Assembly Groups You Can Identify Immediately

Three groups I’d highlight: Undercarriage (index 1) – track frames, rollers, sprockets. Engine & Electrical System (index 3) – starter, alternator, wire harness brackets. Hydraulic Piping & Tank (index 4) – lines, fittings, reservoir. Each group uses the same part-number table format with a “Chan.” column for engineering changes. A 2007.01.10 date stamp on page 3 tells you this catalog was current for machines built before that service bulletin cut-off – handy when you’re ordering NOS parts.

Using This Catalog for a Real Engine Teardown

Say you’re replacing the cylinder head on a TB108 that’s blown a head gasket. The parts catalog gives you: head gasket part number, head bolts (not listed here – that’s for the workshop manual), valve stem seals, injector copper washers. Every sealing component has a separate line item. You can build a complete gasket kit from the index without buying a pre-packaged set that includes parts you don’t need. Combine this with the Takeuchi TB108 Workshop Manual for torque sequences and clearances – the parts catalog doesn’t include assembly specs, but it nails the part numbers. Pair it with the Takeuchi TB108 Parts Catalog (same document, different emphasis) and the Takeuchi TB108 Service Manual for diagnostic flow charts.

Why You Don’t Trust Aftermarket Parts Lists

Aftermarket catalogues often copy the OEM drawings but drop part numbers or merge supersessions. I’ve seen a Chinese listing for a TB108 track tensioner that cross-referenced to a Bobcat model – wrong bolt pattern, wrong bore size. This catalog is a direct scan of the Takeuchi-issued book. No third-party reinterpretation. If the part number ends with a dash-1 suffix, you know exactly which revision. The Automotive Industry Overview covers why OEM documentation matters for liability – but on the shop floor, it’s about not ordering the same part twice.

Who Actually Needs This?

If you’re a DIY mechanic keeping a single TB108 running on your property, this catalog saves you the trip to the dealer parts counter. Home garage enthusiasts wrenching on compact excavators – you need the serial number prefix (BB5Z104-1) to confirm fitment. Professional mechanics billing by the hour: stop wasting time on wrong parts. Workshop owners stocking a fleet: use this to build a reference binder. Every page is a direct copy – no reprints, no generic drawings.

One more thing: the index on page 0 lists the reference as “MACHINARY(TB108-A4)” – That’s Takeuchi’s internal title. You’ll see that code on the actual component labels if the machine was built after serial 10820001. Cross-check it. If your machine falls outside that range, you might need an earlier catalog – we can help with that.

Does this parts catalog include torque specs for the cylinder head?

No. This is a parts catalog – part numbers only. Torque values belong in the workshop manual. Get that separately.

How do I look up a part if I only have the old label number?

Look for the “Ref.” code on each page – for example, the lower frame uses “B5A111”. That reference matches the drawing number on the machine’s identification plate. If your part has a stamped number, search the ‘Item’ column (1-1-13, 1-2-6, etc.) to locate the row. The table gives you the description and the part number. If the part is superseded, the “Chan.” column will show a different number. Write down both and order using the latest one – old stock may still be compatible, but the factory revision ensures fitment for the serial range. If you can’t find the number, call a dealer with the engine serial number (2TNV70-PTB) and the catalog in front of you – they’ll confirm in two minutes. Don’t rely on eBay cross-references – I’ve seen guys order a hydraulic pump that turned out to be a steering cylinder bracket. Not pretty.

You’ve got the machine on blocks, parts scattered on the bench, and a deadline. Access the Factory Manual now and stop burning time on parts lookup rabbit holes. Every TB108 owner I know keeps this catalog within arm’s reach – a 217-page safety net for your wallet and your schedule.