Description

Hitachi Sumitomo ZAXIS 135US, ZAXIS 135US-E, ZAXIS 135USK Parts Catalog

I’ve had it up to here with junkyards selling me a “universal” relief valve that doesn’t match the factory part number. Then the machine spews oil all over the track because the thread pitch is off by half a millimeter. That’s why I only touch OEM parts catalogs when I’m rebuilding a pump or swapping a brake valve. This Hitachi Sumitomo ZAXIS 135US, ZAXIS 135US-E, ZAXIS 135USK Parts Catalog is the real deal – 210 pages of factory exploded diagrams with Hitachi’s own part numbers. No aftermarket cross-references, no translation errors. If you’re rebuilding the hydraulic system on a ZAXIS 135US, you need this on your tablet next to the bench.

Pump and Motor: Where the Work Gets Done

The catalog breaks the pump assembly into four sections: PUMP DEVICE, PUMP ; UNIT, REGULATOR, and PUMP ; GEAR. Each one lists every bolt, seal, and shim with a quantity. Need a regulator for the ZAXIS 135US-E? You’ll find the exact part number under REGULATOR. Same for the travel motor. The MOTOR section covers MOTOR ; OIL (SWING) and MOTOR ; OIL (TRAVEL) with their respective brake valves. The VALVE ; BRAKE sub-sections are split between swing and travel – don’t mix them up. I’ve seen guys order the wrong brake cartridge because they skimped on documentation. Spend the ten minutes to read the exploded view. Your wallet will thank you.

Valve System Coverage – Control and Shuttle Valves

This catalog dedicates over twenty pages to the valve stack alone. You get VALVE ; CONTROL broken into eight parts (1/8 through 8/8) for both the main bank and a duplicate set – looks like they cover different serial number ranges. Then there are separate sections for VALVE ; CONTROL (BLADE), VALVE ; PILOT (FRONT, SWING), VALVE ; PILOT (TRAVEL), VALVE ; PILOT (BLADE), VALVE ; SOLENOID, and VALVE ; SHUTTLE (five parts each). If you’re chasing a drifting boom, the valve body or shuttle assembly is where you need to look. Every spring, spool, and O-ring has a factory reference. Aftermarket manuals often skip the shuttle valve detail because they cram it into one drawing. Hitachi didn’t. They show you the exploded stack so you can spot the worn seal that causes the slow creep.

Brake Valve Assembly: What You Get

Two entries for VALVE ; BRAKE – one under MOTOR ; OIL (SWING) and one under MOTOR ; OIL (TRAVEL). That’s critical because the swing brake and travel brake are different units. The catalog gives you the part numbers for the entire brake valve as an assembly, plus individual components like the relief valve that sits on top. If you’ve ever had a ZAXIS 135USK refuse to hold position on a slope, it’s often the travel brake valve leaking internally. With this catalog, you can order the exact seal kit or replacement cartridge without pulling the whole motor apart first.

210 Pages of OEM Breakdown

Three major sections – PUMP, MOTOR, VALVE, CYLINDER – plus a PARTS INDEX at the back. The cylinder section covers BOOM (R and L), ARM, BUCKET, and BLADE (R and L). Each cylinder has a sub-section for the holding valve when applicable. The holding valve pages show you the internal cartridge and the O-ring locations. That’s the kind of detail that saves you from buying a whole cylinder when a fifty-cent seal is the problem. Total page count is 210, and every page is dated to serial number 060001 and up. Make sure your machine falls in that range before you buy.

Does This Catalog Cover the Fuel Systems or Electronics?

No. This is a parts catalog for the hydraulic and structural components only. You won’t find engine internal part numbers or wiring diagrams here. What you do get is a complete list of every hydraulic component – from the pump gear to the blade cylinder seal – with Hitachi Sumitomo’s own part numbers. If you need the engine manual, check the related manuals below. For the hydraulic systems on the ZAXIS 135US, 135US-E, or 135USK, this catalog is the only source I trust.

How to Use This Manual Without Wasting Time

Start with the PARTS INDEX at the back – it’s alphabetical by component. Find the part name, note the page number, flip to that page, and cross-check the exploded diagram. Every part number is printed next to a bubble callout. Write down the number, order it from your dealer, done. Do not rely on the online Parts Lookup from some third-party site that re-photographs a faded copy. This is the original file straight from the factory. HITACHI ZAXIS 135US Parts Catalog is the same document. If you want broader coverage, Hitachi Sumitomo ZAXIS 135US, 135USK, 225USR, 225US, 125US 2006 User Manual covers the operator’s procedures. For a larger machine family, Hitachi Sumitomo ZAXIS850-3 Series Parts Catalog – 451 Pages gives you a similar depth of detail.

Why Factory Documentation Beats Aftermarket Every Time

Aftermarket parts catalogs often renumber parts or compress multiple variations into one drawing. That leads to ordering a valve body that doesn’t have the correct port orientation. Hitachi Sumitomo’s engineers wrote this catalog for their own technicians. Page 3 includes the memorandum table for your machine’s serial number and engine details – they expect you to fill that in before ordering. That’s the level of specificity I respect. No generic “compatible with” claims. Automotive Industry Overview can tell you theory, but this catalog tells you the part number.

Can I use this catalog for a ZAXIS 135USK with an older serial number?

It covers serial number 060001 and up. If your machine is older, cross-check the VALVE ; CONTROL sections – they have duplicates that may correspond to earlier builds.

Does it include torque values?

No. This is a parts catalog, not a service manual. It lists part numbers and quantities, not assembly torque specs.

What about aftermarket replacement parts?

You can use aftermarket parts, but you need the OEM part number to cross-reference. This catalog gives you the exact Hitachi Sumitomo number so you can match thread pitch and material specs.

Is there a paper version?

The file is digital – 210-page PDF. You can print it, but I recommend keeping it on a tablet in a waterproof sleeve near the machine.

You’ve got a machine that needs parts, and you don’t want to guess. Pull up the exploded view, find the number, and order it. Access the Factory Manual from AutoRepairManuals and keep it in your tool kit. If you run into a valve stack you can’t identify, this catalog will save you from buying the wrong cartridge. Automotive Industry Overview won’t help you there – only this OEM book will.