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Hitachi Sumitomo 370HD Parts Catalog – OEM Exploded Views

Hitachi Sumitomo 370HD Parts Catalog – OEM Exploded Views

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OEM parts catalog for Hitachi Sumitomo 370HD excavator: 362 pages of exploded diagrams, part numbers, and serial number applicability.

SKU: 31114010364 Categories: , , Brand:

Description

Hitachi Sumitomo 370HD Parts Catalog

Hitachi Sumitomo 370HD Parts Catalog cover showing cab and undercarriage diagrams

If you are ordering parts for a Hitachi Sumitomo 370HD excavator, grab a chair. Aftermarket parts booklets get the part numbers wrong more often than not. This Parts Catalog is the factory set — the same one dealers use to pull inventory numbers. 362 pages of exploded diagrams and OEM part codes. No translations, no third-party edits. Just the raw Japanese-English split sheet with item numbers, quantity (Q’TY), service codes (S.C), and supersession info (REPLACEABLE PARTS, OLD PART NO.). That is what you need when the undercarriage track frame throws a roller or the cab headguard-integrated assembly cracks a mount.

Bolt SEMS part J020816? It is on page 268. Track guard for HD track? Look under UNDERCARRIAGE, TRACK GUARD section. Every piece in this catalog is tied to a specific serial number range — the columns marked 適用号機 (SERIAL NO.) and 旧品部番 (ICA PART NO.) tell you exactly what fits. Do not guess. Do not measure. Read the book.

CAB (2) Through (6) – Headguard-Integrated Assembly

The cab sections break down the whole structure into 5 exploded views: CAB (2) through (6) all start with the [HEADGUARD-INTEGRATED] tag for the 370HD. Page 267 shows the lever, handrail, striker, and four different guards (part numbers 4411596 through 4411599) with quantities. Page 270 covers the rubber bushings (bushing, rubber) — part 4372089, 4204953, 4206409, 4404835 — and the seat and cover plates. If you have a loose striker or a broken guard on the headguard assembly, these pages give you the exact bolt and washer sizes. Bolts are SEMS type (nut pre-assembled). No aftermarket substitute will match the thread pitch without trying three different lengths. Use the factory part number.

Undercarriage: Track Frames, Rollers, and Piping

This catalog has separate subsections for Standard Track, LC Track, and HD Track — all three are in the 370HD range. Track frames, step, track guards (with model codes <300,LC><330LC> etc.), full-length track guards, swing bearing, travel device, front idler, adjuster, upper roller, lower roller, track link, center joint, travel piping, and travel motor covers. Each component list gives the part number, quantity, and whether the part is shared or specific to a track type. Example: LOWER ROLLER (STD. TRACK) is different from LOWER ROLLER (HD TRACK). Order the wrong one and the bolt pattern won’t line up. The catalog tells you which is which. The travel device support for HD track is listed separately from STD/LC. Do not mix them.

Front-End Attachments: Booms, Arms, Cylinders, and Buckets

Three boom types: STD. BOOM (<300,LC><330LC><370>), H BOOM (<350H,LCH><370HD>), K BOOM (<350K,LCK>). Three arm lengths: STD. ARM 3.2M, H ARM 3.2M, K ARM 3.2, plus SHORT ARM 2.66M and LONG ARM 4.0M. Each has its own front piping layout. Boom cylinders (R and L) are separate parts. Bucket options range from 1.15 m³ to 1.86 m³, plus rock buckets, ripper bucket, and a K bucket for the 350K series. If you need the bucket tooth for a SUPER V TOOTH 1.4 m³, the part is listed under BUCKET 1.4 JIS 94. The catalog also covers auto-lubricate device and piping, hose rupture valve piping, and breaker/crusher piping. The breaker sections include control pedal, pilot piping, main piping, boom piping, arm piping, and NPK breaker piping. Every line has a part number. No need to call the dealer and hope they read you the right one.

Source Authenticity: Factory Print, Not Aftermarket Repro

This is a scan of the original Hitachi Sumitomo parts catalog, published for the 370HD model. The file name is Hitachi_370HD_Parts_Catalog_ja-en-31114010364.pdf — the Japanese and English side-by-side pages match the physical book. Aftermarket parts catalogs often omit the interchange section (REPLACEABLE PARTS) and the serial number range column. That is where mistakes happen. If you use a third-party part list and the supersession data is missing, you end up ordering a part that was only made until serial number D98/06. The factory catalog shows the change point. For example, the HOSE RUPTURE VALVE PIPING (BOOM) : 2 has two separate entries: one for up to D98/06 and one for from D98/07. That level of detail is not in any generic PDF you find on a forum. Pay for the real data once.

3 Sections of the TOC That Will Save You Time

First: the UNDERCARRIAGE section has 32 subsections, each for a specific track type. Second: the FRONT-END ATTACHMENTS section breaks booms, arms, and buckets into separate models so you don’t have to decode a master list. Third: the BREAKER & CRUSHER PARTS section covers control pedal, pilot piping, and all four piping circuits — if you are retrofitting a breaker, those pages give the OEM routing and part numbers. The PDF bookmarks mirror the TOC exactly, so you can jump from CAB (2) to TRAVEL DEVICE SUPPORT (HD TRACK) in two clicks. No flipping through microfilm.

FAQ

Can I use this catalog to order parts for a 370HD with a different cab type?
Yes. The catalog lists all cab variants: headguard-integrated for the 370HD, standard cab for the 370, and options like power window, sunshade, tropical cover, and USA window guard. Each section has a

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