Description

Hitachi Sumitomo ZW310, ZW310-A Parts Catalog

If you have ever ordered a radiator hose for a ZW310 only to find the inlet diameter is off by 3 mm because the serial number range was wrong, you know exactly why this 597-page OEM Hitachi Sumitomo ZW310, ZW310-A Parts Catalog belongs on your workbench. The aftermarket parts listings I have seen are garbage – they combine multiple model years into one drawing and leave you guessing. This is the original Japanese factory document, scanned and searchable. Page 3 gives you the memorandum block where you fill in your machine’s PIN and engine type (OM460LA). No translation guesswork – the English and Japanese columns are side by side.

Engine and Cooling Device Sections – What You Actually Get

Open the ENGINE bookmark and you find the main engine assembly, then the cooling device broken down by serial number ranges: 005101-005102 / 000101-000108, and 005103- / 000109-004999. Those numbers matter because the fan blade pitch changed. The Cooling section alone has 12 sub-sections: radiator (RAD), cooling device parts, cooling device piping (two separate runs plus a bypass line), and the cooling fan (FPM001). Without this breakdown you will order the wrong fan clutch or a hose that routes into a bracket that does not exist on your machine. Page 4 explains every service code symbol – W for local modification, H for precision parts, D for assembly-only replacements. That page alone saves you from buying parts you cannot install.

Decoding the Part Symbols – Why Page 4 Matters

The foreword on page 4 lists compatibility marks: Y means unconditional interchange, I means the alternate part can substitute but not vice versa, T means matched sets only, P means the part is superseded and you must use the alternate listed. I have seen techs buy a “compatible” water pump from a third-party vendor because the catalog number looked close – then the pump shaft sheared at 200 hours because the bearing stack was different. This manual tells you exactly which Hitachi Sumitomo part number to order and whether you can mix old and new.

Does This Parts Catalog Cover Your Machine?

Look at the top of each page. You will see machine model codes in brackets: [H3J] for Europe (serial 4HF, 000101-004999), [HCJ] for Japan (4HA, 005101-005999), [HAJ] for Japan (4HD, 006001-007999), and [HEJ] for other territories (4HA, 005101-005999 and 008001-). The ZW310 and ZW310-A share the same base frame but divert on things like the counterweight (1.8t for 6AJ/HAJ/HEJ, 2.5t optional) and the breather for Italy road homologation (FTBITL). You cannot use a generic aftermarket catalog and get these splits right.

3 Reasons to Choose the Factory Parts Catalog Over Aftermarket

First, the layout mirrors the actual machine assembly – front axle (TPD and LSD), rear axle (same), propeller shaft, then tires with separate sections for [6AJ, HAJ, HEJ] and [H3J] rims. Second, every part number is tied to a specific serial number range, not a vague “fits 2014-2018” label. Third, the compatibility codes prevent you from buying a part that requires a different bracket or harness. Aftermarket catalogs omit these codes because they don’t have access to the factory engineering change data.

Power Train, Chassis, and Cab – What the Rest of the 597 Pages Cover

The POWER TRAIN section includes the torque converter, torque converter piping, front and rear axles with optional LSD, propeller shaft, stoppers (OSK008/OSK011), and multiple tire variants. CHASSIS covers the front frame, rear frame, belly guard (BGK), counterweight (1.8t or 2.5t), five different cover groups, gas springs, floor boards (five sub-sections), and full rear fender. CAB includes the ROPS cab (ROC), left and right doors, rear console, mat, radio (four variants!), stereo, rear view mirrors, steering column and wheel, air conditioner (AC400 with three parts sub-sections plus piping), multiple seat options (KAB, Grammer, air-suspension with Hitachi logo or no logo), and cockpit assembly. Each of these sub-sections has its own part number and serial number range. The ELECTRICAL SYSTEM section finishes the book with front and rear electrical parts in three sub-sections. You cannot guess your way through a steering column rebuild without knowing the [6AJ] column differs from the [H3J, HAJ, HEJ] column.

FAQ

Does this parts catalog include engine internal parts?

No. The foreword states that engine internal parts are in a separate engine parts catalog. This book covers the engine as an assembly and all mounting, cooling, and intake/exhaust components.

How do I use the compatibility codes to avoid buying the wrong part?

On each parts page you will see a column labeled “互換性” (compatibility). The symbols Y, I, T, P, and their meanings are defined on page 4. For example, if code I appears, the alternate part number listed in the substitution column can replace the original, but you cannot go the other way. If code P appears, the original part is prohibited – you must order the superseding part. Always check the serial number range at the top of the page first, then the compatibility code. This manual also notes when a part is an oversize (OS) or undersize (US) service part, which are listed directly below the standard part. If you ignore these codes you will likely order a part that either does not fit or requires additional machining that the factory does not support.

When you are working on a machine that costs six figures new, and a wrong radiator hose or a mis-matched axle seal can put it down for a week, you do not mess with aftermarket parts lists. Access the Factory Manual and keep it on your tablet next to the impact gun. Every part number, every serial split, every compatibility note – it is all in the original OEM format. The HITACHI ZW310 Wheel Loader Technical Manual and HITACHI ZW310 Technical Manual are separate service documents, but for ordering parts this catalog is the only source you should trust. Also check the HITACHI ZW310 Parts Catalog if you need an older print edition. For background on why OEM documentation matters, see the Automotive Industry Overview. The same principle applies to heavy equipment – factory data is not negotiable. Automotive Industry Overview