Description

Hitachi Sumitomo ZAXIS 400R-3, ZAXIS 400LCH-3 Parts Catalog

If you have ever ordered a part for a ZAXIS 400R-3 or 400LCH-3 from an aftermarket parts listing and ended up with a fuel tank that didn’t match the mounting holes, you know exactly why you need this Hitachi Sumitomo ZAXIS 400R-3, ZAXIS 400LCH-3 Parts Catalog. I have seen guys pull a counterweight bolt with the wrong thread pitch because they trusted a third-party database. That is billable time down the drain and a machine sitting on blocks. This is the factory catalog – the same one Hitachi dealers use to source parts. No guesswork, no “compatible” listings that aren’t. It’s 216 pages of exploded diagrams, part numbers, quantities, interchangeability codes, and service symbols that tell you exactly what fits.

Upper Structure and Fuel System Parts

The catalog breaks down the upper structure into every assembly you will touch. Frame, counterweight, fuel tank (listed twice because there are separate tank sections for different serial number ranges), oil tank, drain piping, main piping in four variants, pilot piping, and the entire electric parts group including the horn and air conditioner. Each page shows you the exploded view with callouts and a table of part numbers. The fuel tank section alone can save you a week of cross-referencing – you get the exact tank, filler neck, seals, and mounting hardware with Hitachi Sumitomo factory part numbers. No aftermarket repackaging.

What Does the Under Carriage Section Cover?

Track frames for both LCH and R configurations, full-length track guards, steps, travel devices, travel motors (two separate motor/oil sections), travel device support, front idlers left and right, adjuster assemblies, upper and lower rollers, track links, travel piping, and travel motor covers. The catalog marks every part with a quantity per machine. If you are rebuilding an undercarriage, you need the correct roller part numbers – the same ones Hitachi shipped from the factory. This section also includes the travel motor oil motor breakdown (1/2 and 2/2), so you can order seals and bearings without tearing the motor apart twice.

216 Pages of Factory Part Numbers and Diagrams

Every page is laid out the same way: illustration on the left (or top), table on the right (or bottom) with part number, description, quantity per machine, service code, and interchangeability symbols. The symbols – W, H, D, K, R, S, Z, OP, OS, US, #, Y, I, T, P – are defined in the foreword on pages 3 and 4. That is critical: the “P” symbol means the part is prohibited and you must use the alternative listed. The “Y” means full interchangeability. Aftermarket catalogs skip this. Hitachi does not. You get the real manufacturing codes for supersessions and field modifications.

Use the Parts Index to Avoid Ordering Wrong Components

At the back of the catalog is a PARTS INDEX that lists every part number alphabetically (or numerically) with the page where it appears. When a machine comes in with a damaged H boom or a broken R arm, flip to the index, find the part number, and go straight to the H BOOM or R ARM 3.20m section. The front-end attachments section also covers link assemblies, front piping, lubricate piping for boom and arm, and rock buckets in 1.6m³ and 1.5m³ (JIS 94). Do not guess the bucket part number – the catalog shows the buckets with their cutting edges, side cutters, and pin retainers.

Breaker and Crusher Attachment: Dedicated Parts Section

If your 400R-3 or 400LCH-3 is equipped with a breaker or crusher, this catalog has a separate set of pages: breaker/crusher piping on the boom and arm, the control pedal (accelerator pedal type), electric parts for the breaker, and main piping variants for both R and LCH machines. The slight variations between the right-hand and left-hand versions are clearly separated in the table of contents. Ignore the OEM drawings and you will order the wrong bracket for the control pedal – I have seen it happen.

One more thing about parts ordering: the memorandum page (page 2) has blanks for the Product Identification Number, engine type, and engine manufacturing number. Fill those in when you order. That is how Hitachi Sumitomo verifies compatibility. Skip that step and you might get the wrong revision of a part.

Why This 216-Page Catalog Beats Aftermarket Listings

I have used aftermarket parts websites that claim to cover ZAXIS 400R-3 models. Every single time I found a mistake – a wrong part number for the front idler adjuster, a missing supersession code, or a fuel tank listed with the wrong capacity. This catalog is the original Hitachi Sumitomo file, scanned and verified. It is the same document that dealers print from their internal parts system. For context on why OEM documentation matters in heavy equipment, read the Automotive Industry Overview – but the short version is that aftermarket reprints save money by skipping the fine print. You do not have that luxury when a machine is down.

Related Manuals

• Hitachi Sumitomo ZAXIS850-3 Series Parts Catalog – 451 Pages
• Hitachi Sumitomo ZAXIS 600-650LCH Parts Catalog – 162 Pages
• Hitachi Sumitomo ZX500LC ZX500LCH Parts Catalog – 150 Pages OEM

Also refer to Automotive Industry Overview for general background on component numbering systems used in construction machinery.

Does this catalog include torque specifications or repair procedures?

No. This is strictly a Parts Catalog – it lists part numbers, illustrations, and ordering information. For service procedures and torque values, you need the matching service manual.

How do I find the correct part for my machine if the serial number falls between two ranges shown in the catalog?

Check the “Applicable Machine” column in each parts table. Hitachi Sumitomo uses columns like “D” (date of change) and “H” (machine serial number). If your machine serial is 001301, for example, and the table shows a change at 001001 and 002001, look for the row that includes your number. The foreword explains all symbols on pages 3-4. Use the PARTS INDEX to cross-reference part numbers when supersessions occur – the “Y” and “T” symbols indicate interchangeability. If you are still unsure, write down your Product Identification Number and contact your Hitachi dealer with the part numbers from this catalog. They can run the serial against the latest factory updates.

Stop wasting time with mismatched parts and incorrect listings. Access the Factory Manual now and get the correct Hitachi Sumitomo part numbers for your ZAXIS 400R-3 or 400LCH-3 excavator.