Description

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. Access 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.