Hitachi Sumitomo ZAXIS 270, ZAXIS 270LC, ZAXIS 280LC, ZAXIS 280LCN Parts Catalog

If you manage a Hitachi Sumitomo excavator – whether it is a ZAXIS 270, ZAXIS 270LC, ZAXIS 280LC, or ZAXIS 280LCN – then you know the pain of ordering wrong parts from aftermarket cross-reference lists. One misidentified brake valve or a misread regulator number can kill a workday. I have seen it happen. This is the Parts Catalog that Hitachi Sumitomo issued for the ZAXIS 270 series. 202 pages of exploded diagrams and factory part numbers. Nothing else gives you that level of certainty.

Page 1 alone tells you the serial number range (020001~) and confirms these models. That is the kind of detail aftermarket reprints skip. You need this document bolted to your shop tablet or printed out and tabbed. There is no substitute for factory data when you are rebuilding a swing motor or chasing a shuttle valve leak.

Hitachi Sumitomo ZAXIS 270 Series – What This Parts Catalog Covers

This catalog breaks down every major hydraulic and structural system. Pump, motor, valve, cylinder – each section gives you the exact part number, quantity per assembly, and any service code flags like W (local work required) or D (assembly only). The TOC starts with PUMP – including PUMP DEVICE, PUMP;UNIT, REGULATOR (R) and (L), and PUMP;GEAR. Then MOTOR;OIL – covering swing and travel motors, plus the critical Brake valves and relief valves. The Valve section alone runs pages through multiple sub-assemblies: CONTROL VALVES (5 sub-sections), SHUTTLE VALVES (5 sub-sections), PILOT VALVES, SOLENOID, SLOW-RETURN, LOCK, SELECTOR, and the HOLDING valves for boom and arm. CYLINDER section covers boom right/left, arm mono/2P, bucket, and cylinders with holding valves. Finally, a PARTS INDEX lets you look up any number alphabetically. That is the kind of structure you need when the dealer says “we need a serial number” and you already have it on page 1.

Pump System – Device, Unit, and Regulator Parts

When the pilot pressure drops or the main pump starts to cavitate, you need to know which regulator piston came out and which shim goes back. This catalog gives you the part numbers for the PUMP DEVICE assembly, the unit itself, and the left and right REGULATOR with all sub-components. Gear pump parts are also listed separately. No guesswork – grab the number, call the supplier, and move on.

Motor;Oil – Swing and Travel Motor Components

The travel motor on a ZAXIS 280LC takes a beating in mud and rock. This section covers MOTOR;OIL (SWING) and MOTOR;OIL (TRAVEL), with two separate entries for the travel motor – one with the brake valve and relief valve, one with the servo piston. The Brake valve (VALVE;BRAKE) appears under both motor entries. If you have a track that drags or a swing that creeps, the part number for that brake valve is right here. Do not waste time on aftermarket cross-reference databases that list three different numbers. Use the factory spec.

Valve and Brake Systems – Detailed Breakdown

This is the thickest part of the catalog – and for good reason. The control valve assembly is split into five consecutive sections (VALVE;CONTROL 1/5 through 5/5) plus a BODY ASS’Y and COVER ASS’Y. Then you get the RELIEF valves, PILOT valves for front/swing and travel, SOLENOID, SLOW-RETURN, and five sub-sections of SHUTTLE valves – repeated three times across the document because each set is used in different circuits. The LOCK valve, SELECTOR valve, and the HOLDING valves for boom and arm are all here. The OIL FILTER is also listed. If you need to rebuild a shuttle valve bank or replace a holding valve, the exploded diagram shows each O-ring and spring. That kind of detail keeps you from ordering incomplete kits.

Cylinder Assemblies – Boom, Arm, and Bucket

Cylinder seals blow – it happens. This section lists CYL.;BOOM (R) and (L), CYL.;ARM (MONO BOOM and 2P-BOOM), CYL.;BUCKET, plus a general CYL. entry and one marked CYL. [WITH HOLDING VALVE]. The holding valve itself (VALVE;HOLDING POSITIONING) is also shown. When you order a rod seal kit, you need to match the boom configuration – mono vs. two-piece boom. The catalog makes that distinction.

How to Use the Parts Index

Page 202 gives you a full parts index – all part numbers listed alphabetically with the page where they appear. You can cross-reference between sections easily. For example, if you find the brake valve number in the motor section and want to see if it also appears in the valve section, the index tells you. That saves you flipping through 200 pages blind.

Why OEM Documentation Beats Aftermarket Copies

Aftermarket parts catalogs for this series pull numbers from third-party databases that have errors. This is the original Hitachi Sumitomo PDF – scanned from the factory microfiche. The service codes (W, D, K, R, S, OP, OS, US, Y, I, T, P) are explained on page 1. I have seen customers get burned by a “I” code on a shuttle valve that they missed, and the substitute part was out of stock. Factory documentation prevents that. For background on industry standards, see Automotive Industry Overview. The same principles apply to heavy equipment.

Need related resources? Check the HITACHI ZAXIS 270 280LC Excavator Parts Catalog for additional coverage, or the HITACHI ZAXIS 270 280 Parts Catalog if you need a variant. For older models, see Hitachi Sumitomo ZAXIS 270, ZAXIS 200, ZAXIS 230, ZAXIS 225USR, ZAXIS 225US Work.

Does this parts catalog include torque specifications?

No. This is a parts catalog – it shows part numbers and quantities, not repair procedures. For torque values you need the service manual.

How do I find the part number for the travel motor brake valve on a ZAXIS 280LC?

Go to the MOTOR;OIL (TRAVEL) section. You will see two entries for travel motor – one lists the VALVE;BRAKE and VALVE;RELIEF, the other lists the PISTON;SERVO and then repeats the brake valve. The exploded diagram will show the part number for the brake valve assembly. Each sub-component (spring, piston, O-ring) has its own number. Use the PARTS INDEX on page 202 to verify that number appears elsewhere. Then order that number from the dealer. Do not substitute – the brake valve on a 280LC is different from the 270LC because of the track width. The catalog makes that clear.

Stop wasting time with aftermarket diagrams that may or may not match your machine. Download the Factory Manual for your Hitachi Sumitomo ZAXIS excavator today. You will have the exact part numbers, exploded views, and service codes the dealer uses. That is time back in your day and money not spent on returns. Get the OEM PDF now.

I’ve been wrenching for 28 years, ASE Master. If there’s one thing that burns my ass, it’s ordering a part that doesn’t fit because someone used a cross-reference from a third-party site. This Hitachi Sumitomo ZAXIS 270, ZAXIS 270LC, ZAXIS 280LC, ZAXIS 280LCN Parts Catalog is the real deal – factory pages, 598 of them, scanned from the original binder. No aftermarket shortcuts, no translated part numbers that end up being wrong. You want the exact bolt for the boom foot pin? It’s in here. You need the fuel feed pump part number for a ZAXIS 270? Page 1 of the fuel section. That’s the kind of certainty you get when the OEM built the book.

Hitachi Sumitomo ZAXIS 270/280LC Parts Catalog: Engine and Fuel Sections

Engine parts live under the ENGINE and FUEL TANK headings. You get the full breakdown: ENGINE SUPPORT, OIL FILTER PIPING, INTER COOLER PIPING, RADIATOR, AIR CLEANER, PRE CLEANER, MUFFLER, FUEL TANK SUPPORT, FUEL PIPING, FUEL FEED PUMP, and FUEL DOUBLE FILTER. Each part number is listed with quantity and compatibility codes. If you’re swapping a fuel filter on a ZAXIS 280LCN, you’ll find the correct double filter assembly under FUEL DOUBLE FILTER. Don’t waste time pulling the wrong part off the shelf – verify with the factory drawing first.

What Makes This Parts Catalog Different From Aftermarket?

Aftermarket parts catalogs often merge multiple models into one generic drawing. This one separates the ZAXIS 270, 270LC, 280LC, and 280LCN with specific <270>, <280>, [STD], [NA], [EU1], [EU2] markings. The boom light harness is different between mono boom and 2P-boom – the catalog lists both under BOOM LIGHT HARNESS. The seat variants (cloth, vinyl, suspension, air-suspension with heater) each have their own pages. If you need a seat belt for a suspension seat on a ZAXIS 270 shipped to North America, the [NA] tag points you to the right part. That level of specificity is why you pay for OEM documentation.

598 Pages of Factory Exploded Views

Every section – from UPPERSTRUCTURE (FRAME, SWING BEARING SUPPORT, CENTER JOINT) to CAB GROUP (CAB, WINDOW GUARD, DOOR LOCK, WEATHER STRIP) – is illustrated with numbered callouts. You don’t guess which bolt goes where. The exploded view shows the order of assembly. The parts list below each drawing gives the part number, name, quantity per machine, and service code. For example, the COUNTERWEIGHT sections are split by weight: 6.1T and 6.5T. If you’re pulling a counterweight to replace a swing motor, you need the correct bolts listed on the counterweight page. The catalog includes all that.

Check the Counterweight and Frame Diagrams

Under FRAME you’ll find the main structure, including the BOOM FOOT PIN assembly. If you’re swapping a center joint on a ZAXIS 280LC, the CENTER JOINT PARTS (UPPERSTRUCTURE) section shows the seals and bearings. The hydraulic piping sections (SUCTION, DELIVERY, RETURN, DRAIN, MAIN PIPING 1-4) are all isolated. Need a specific O-ring for the pilot piping? PILOT PIPING (A) through (J) cover every circuit. This manual is organized so you can find the exact component without flipping through fifty pages of generic diagrams.

Upperstructure: Frame, Swing Bearing, and Center Joint

The upperstructure section alone covers the frame, swing bearing support, boom foot pin, and center joint. If you’re replacing the swing bearing, the parts list includes the bearing itself, retaining bolts, and the support structure. The manual also shows the center joint with its internal seals – critical for preventing hydraulic leaks. Don’t rely on aftermarket manuals that might skip the center joint details. Stick with the OEM file from AutoRepairManuals.

I’ve seen too many techs order the wrong hydraulic line because they trusted an aftermarket cross-reference. This catalog eliminates that risk. For other Hitachi Sumitomo models, check Hitachi Sumitomo ZAXIS 270/280LC Parts Catalog – OEM Factory Specs and Hitachi Sumitomo ZAXIS 270 280LC Parts Catalog – 588 Pages. Also see Hitachi Sumitomo ZAXIS 270, ZAXIS 200, ZAXIS 230, ZAXIS 225USR, ZAXIS 225US Work for related manuals. For background on why OEM documentation matters, refer to the Automotive Industry Overview and Automotive Industry Overview.

Does this catalog include torque specs for the swing device?

No, it’s a parts catalog, not a service manual.

Can I use this to rebuild the engine?

You can identify every part in the engine and fuel system. The exploded views show assembly order and part numbers for the engine, oil filter piping, inter cooler, radiator, and fuel system. For rebuild procedures like clearance checks and torque sequences, you need the separate engine service manual. But for ordering pistons, rings, gaskets, and fuel lines, this catalog is all you need. The fuel feed pump part number, fuel double filter, and engine support brackets are all listed with factory codes. Combined with a service manual, it’s a complete rebuild package.

What models are covered?

ZAXIS 270, 270LC, 280LC, 280LCN. Serial number range starts at 020001. Applicable model codes are indicated on each page.

Is this a PDF download?

Yes, you get the full 598-page PDF. Download the Factory Manual from AutoRepairManuals.

Worth every penny if you value your time and parts budget. Download the Factory Manual.