Ihimer 20JX Parts Catalog – 230 Pages of OEM Part Numbers for Mini Excavator

Description

You’re tearing down an Ihimer 20JX undercarriage and the aftermarket parts list shows a roller part number that doesn’t match anything on the machine. That’s wasted time and a half-day wait for the wrong seal. A factory Parts Catalog kills that problem. This one runs 230 pages of exploded views, reference numbers, and the exact fastener counts. No third-party reinterpreting. This is the same booklet that came out of IHI Construction Machinery Limited for the 20JX mini excavator, serial BH000001 and up.

Every index line matches a real OEM sheet. You flip to page 38 for the traction motor assembly – the sheet number 5-1 gives you the complete breakdown of the motor housing, shaft seals, port fittings, and the bolts holding it to the final drive. That’s the kind of detail you need when you’re staring at a pile of greasy parts and a machine that won’t move. Aftermarket catalogs leave out the revision history. This one shows REV No.① and REV No.2 right on the index. You know exactly which build your machine matches.

Lower Machine and Undercarriage – Crawler Shoes, Idlers, Rollers

Section 1 covers the entire lower structure. Sheet 1-1 and 1-2 show the lower machine assembly in two views. Sheet 1-3 is the crawler shoe adjustment device – the tensioner assembly with the grease cylinder and the track adjuster rod. If you’ve ever had a track throw because the adjuster seal blew, you know how critical those parts are. Sheet 1-4 gives the front idler assembly, 1-5 and 1-6 the lower roller assemblies. Each sheet shows the individual rollers with their flange and tread dimensions so you order the right one for your track width. Sheet 1-7 and 1-8 handle the lower traction piping – all the hard lines and hoses that feed the travel motors. One misrouted hose causes a kink and a dead machine. This catalog shows the routing and every fitting.

Turntable and Swing Bearing – Section 2

The turntable assembly (sheet 2-1 and 2-2) breaks down the slew ring, the mounting bolts, and the swing bearing seal. If you’re replacing a swing bearing, you need the bolt torque and the shim stack. This catalog lists the number of bolts and their grade. No guesswork. Aftermarket diagrams often show a generic slew ring – this one matches the IHI casting numbers exactly.

Does the Hydraulic Piping Section Include All Line Variations?

Section 4 covers hydraulic piping, and here’s where the factory catalog earns its keep. Sheet 4-1 and 4-2 show return and suction piping. Sheet 4-3 and 4-4 handle swing and traction piping. Then you get into control piping assemblies for different machine configurations: A～D & A・B・G change, and A・F change. Each variation is drawn separately with a different sheet number. If your 20JX has the optional blade and boom swing circuit, you need the A・F change pages. Aftermarket catalogs collapse these into one generic drawing – good luck figuring out which hose goes where. This catalog keeps them separate. Page 38 also lists the traction motor assembly again under hydraulic instrument, sheet 5-1 through 5-4, so you get the motor exploded view plus the exact O-ring and seal numbers.

8 Systems Documented – From Swing Drive to Cab Hardware

The catalog is organized into eight major sections: Lower Machine, Turntable, Swing Drive, Hydraulic Piping, Hydraulic Instrument, Operating Controls, Power Unit, and Cab & Related Parts. Each section has multiple sheets. For example, the swing drive device (section 3) is only two sheets but tells you the brake valve assembly and the gear housing. The power unit (section 7) includes engine and accessories (sheet 7-1), air cleaner and muffler (7-2), oil pump drive device (7-3), and fuel tank with piping (7-4). That’s 230 pages of pure part intelligence.

Get the Right Part Number the First Time

You don’t have time to cross-reference three aftermarket sites. The factory catalog gives you the OEM number that IHI stamped on the part. The index lists every sheet and the page number where the drawing lives. Page 94, for example, starts the power unit section – you’ll find the engine accessory drive belt part number right there. The cab section (8) includes cover assemblies, noise absorbent panels, canopy options (including TOPS), operator seat, swing lock, counterweight, and name plates in multiple languages. If you need a replacement decal for the Italian market, sheet 8-6A shows it. That’s the level of detail that saves you from ordering a left-hand canopy stay when you needed the right-hand one.

Is this the same as a reprint PDF from a third-party site?

No. This is the original IHI Construction Machinery Limited publication – the same one the dealer would pull up. The index shows REV numbers, sheet numbers, and page numbers exactly as printed at the factory.

Can I order parts directly from this catalog?

Absolutely. Each exploded view has a callout number and a corresponding part number in the table. Take the IHI number to any OEM dealer and they will recognize it immediately.

Does the hydraulic instrument section cover the boom, arm, and bucket cylinders?

Yes. Sheets 5-8 through 5-12 cover boom, arm, bucket, boom swing, and blade cylinders. Each cylinder is shown with the gland nut, rod seal kit, and piston ring parts. Sheet 5-13 covers the multiple valve assemblies for different machine variations (A～D, A・B・G, A・F). If you have a 20JX with a hydraulic auxiliary circuit, you need the correct valve stack.

What format is the access?

The file is a PDF, scanned from the original printed catalog. You get all 230 pages in a single searchable document. No missing pages, no folds.

Aftermarket parts catalogs will sell you a generic “IHI 20JX” list that misses the A・F change piping or the multiple valve variations. The factory catalog does not. Every sheet is a direct reproduction of the OEM document. You identify the part by sheet number and reference, then order with confidence. This is the same logic we use in the shop – only factory specs get trusted. For related machines, check out Ihimer 80 Parts Catalog – OEM Factory Specs for Mini Excavator, Ihimer 80VX 80NX3 Parts Catalog – Factory OEM Parts List, and Ihimer 14NXT Parts Catalog – Factory OEM Specs. For a broader look at construction equipment documentation standards, see the Automotive Industry Overview. Automotive Industry Overview covers the regulatory framework that drives OEM documentation quality – the same reason factory catalogs stay accurate. Access the Factory Manual and start ordering parts that fit the first time.