Description

Hitachi Sumitomo ZAXIS 120, ZAXIS 120-E, ZAXIS 130, ZAXIS 130H, ZAXIS 130K Parts Catalog

If you are ordering parts for a Hitachi Sumitomo ZAXIS 120 series and trusting an aftermarket cross-reference list, you deserve the headache you are about to get. I have seen more than one machine down because someone ordered a main control valve spool that looked right but had a different pilot pressure relief setting. That machine sat waiting for the correct part. That lost billable time. This catalog fixes that.

What This Catalog Actually Covers

This is the official Parts Catalog for the ZAXIS 120, ZAXIS 120-E, ZAXIS 130, ZAXIS 130H, and ZAXIS 130K hydraulic excavators. It is 224 pages of factory exploded diagrams and part numbers. There is no guesswork. The sections break down every major hydraulic component: pump assemblies, oil motors, control valves, and cylinders. The table of contents lists PUMP with sub-sections for the pump device, unit, regulator, and gear pump. Then MOTOR;OIL covering swing and travel motors with separate brake valve and relief valve pages. That brake valve section is critical — I will get to that.

Valve Assemblies: Where the Manual Earns Its Keep

The VALVE chapter is the thickest part of this catalog — and for good reason. The control valve splits into 16 sub-sections (1/8 through 8/8 repeated for two valve stacks). Each page shows every spool, spring, plug, and seal with the exact part number. You will also find sections for pilot valves (front & swing, travel, and generic), solenoid valves, shuttle valves (5 separate sub-sections), lock valves, and selector valves. If you need the oil filter head assembly, it is there. A technician once called me asking which shuttle valve cartridge to order for a ZAXIS 130H that had slow boom raise. I told him to page 73 in the valve section. He found the exact part. That is the difference. For a deeper dive into electrical issues on this same chassis, check the Hitachi Sumitomo ZAXIS AC Troubleshooting Manual 138 Pages.

Brake Valve Sections: Don’t Guess the Relief Pressure

Every swing and travel motor in these machines uses a brake valve assembly. The catalog lists each VALVE;BRAKE separately under MOTOR;OIL (SWING) and MOTOR;OIL (TRAVEL). There are also dedicated VALVE;RELIEF pages for both. If you swap a brake valve from a ZAXIS 130 into a ZAXIS 120-E without checking the part number, you risk overheating the travel motor. The relief pressure is set differently between the models. I have seen it happen. Do not be that guy.

Under the CYLINDER section you will find boom cylinders (right and left), arm cylinders (mono boom and 2-piece boom), bucket cylinder, and positioning cylinder — many with their own holding valve assemblies. The blade cylinders (right and left) are also listed. That is 18 distinct cylinder sub-sections with part numbers for seals, rods, and bushings. If you need a seal kit for a 2-piece boom arm cylinder, the part number is here.

That is a lot of content.

224 Pages of Factory Part Numbers

The page count alone — 224 pages — tells you this is not a skimpy aftermarket compilation. This is a direct OEM scan from Hitachi Sumitomo. Every page has the manufacturer part number and a diagram showing how the parts fit. The back of the manual includes a PARTS INDEX that lists every part number alphabetically. You can cross-reference a number from a broken component and find the page instantly. I keep one of these in my office for the ZAXIS 130 fleet we service. It saved me a phone call last week when a junior tech could not identify a regulator seal. I pointed to page 18. He found it. If you are also working on larger excavators, consider the Hitachi Sumitomo ZAXIS850-3 Series Parts Catalog – 451 Pages and the Hitachi Sumitomo ZAXIS 600-650LCH Parts Catalog – 162 Pages for complementary coverage.

Source Authenticity: OEM vs Aftermarket

Aftermarket parts catalogs for Hitachi Sumitomo equipment are inconsistent. Some re-label part numbers with their own internal codes. Others omit the superseded revisions. This manual is the genuine factory print. The front matter includes the original part number PISI-EI-4 and the serial number range 060001~. The Japanese text and English translations are both present. You get the exact same document the dealer parts counter uses. For more context on why OEM documentation matters in the heavy equipment sector, read the Automotive Industry Overview — especially the sections on supply chain and standardization. Another external perspective can be found at Automotive Industry Overview.

Pump and Motor Breakdowns

Under PUMP, the catalog breaks down the main pump device, the pump unit, the regulator assembly, and the gear pump. Each sub-section has an exploded view with callouts. If you need the regulator piston kit for a ZAXIS 130H, you will find it on the regulator page. The MOTOR;OIL section covers the swing motor and the travel motor separately. Both include the brake valve and relief valve breakdowns. If a travel motor leaks down, you can order the exact seal set without buying the whole motor. That is money saved. The manual also includes the FILTER;OIL listing under the valve section.

Does this catalog include torque specifications for assembly?

No. This is a parts catalog, not a service manual. It lists part numbers and quantities. For torque specs and repair procedures, you need the corresponding service manual.

How do I know which part number fits my specific machine?

Check the serial number range printed on the cover (060001~). The catalog covers machines from that serial number onward. For earlier machines, you may need a different revision. The catalog also uses compatibility codes (Y, I, T, etc.) in the interchangeability column — read the legend on page 5 before ordering. If your machine has been modified or has an optional attachment (like a positioning cylinder with holding valve), verify the part number against your machine’s production date and front attachment number (F column). When in doubt, cross-reference with the Parts Index at the end.

You are not going to find a cleaner, more accurate parts source for these Hitachi Sumitomo excavators. The cost of ordering one wrong part — shipping, downtime, labor — exceeds the price of this manual many times over. Stop relying on aftermarket lists. Access the Factory Manual now and keep it in your service truck or tablet. You will use it every time a ZAXIS 120 or ZAXIS 130 comes through your bay.