Description

Hitachi Sumitomo ZAXIS 70, ZAXIS 70LC, ZAXIS 80, ZAXIS 80 LCK, ZAXIS 80 SB Parts Catalog

You have a ZAXIS 70 or ZAXIS 80 sitting in the yard with a blown travel motor or a leaking control valve. You need parts, and you need them right the first time. Ordering from a generic parts list gets you the wrong rotary group or a brake valve that doesn’t match your serial number. I’ve seen it happen. Machine down for a week while you send parts back. This Hitachi Sumitomo ZAXIS 70, ZAXIS 70LC, ZAXIS 80, ZAXIS 80 LCK, ZAXIS 80 SB Parts Catalog is the factory document — 176 pages of exploded diagrams, OEM part numbers, and the interchangeability codes that tell you exactly which superseded part fits your machine. No aftermarket compilation. No guesswork.

What This Parts Catalog Actually Covers

This is a genuine Hitachi Sumitomo publication for the ZAXIS 70, ZAXIS 70LC, ZAXIS 80, ZAXIS 80 LCK, and ZAXIS 80 SB (including the SBLC variant). The table of contents breaks the machine into four major sections: PUMP, MOTOR;OIL, VALVE, and CYLINDER. Each section contains detailed group assemblies. For example, under PUMP you’ll find piston pump groups for the <70,80,K> models and the models separately. Under MOTOR;OIL you get the swing motor, travel motor assemblies, and the critical brake valve — both the standard <70,80,K> version and the version with its own relief valve. The valve section alone runs multiple pages: control valves (1/5 through 5/5), pilot valves for front, swing, travel, blade, offset, boom swing, breaker, and crusher, plus shuttle, lock, slow-return, and selector valves. Cylinder section covers boom, arm, offset, bucket, blade, and swing cylinders, including holding valve options. All 176 pages laid out in factory order.

Valve and Brake Assemblies: Factory Part Numbers

Every brake valve assembly appears with its own part number and breakdown. The VALVE;BRAKE <70,80,K> and VALVE;BRAKE sections list each component — springs, pistons, seals — so you can order what actually needs replacing instead of buying a whole assembly. Same for the control valves: the five-part serialization (1/5 through 5/5) lets you pinpoint the exact spool section that’s sticking. The VALVE;RELIEF page gives you the relief cartridge numbers. If you’re rebuilding a travel motor, the brake valve is the first thing I check. This catalog gives you the OEM number so you don’t end up with an aftermarket part that bypasses at the wrong pressure.

Why OEM Documentation Beats Aftermarket

Aftermarket parts catalogs often compress or omit the interchangeability codes. This manual includes the full legend from page 5: Y for unconditional interchange, I for one-way replacement, P for prohibited use (you must use the alternate part), D for on-machine modification required, and so on. Those codes save you from ordering a part that looks right but won’t work on your serial number range. The catalog also marks service kit (K), oversize (OS), and undersize (US) parts. Without these notes, you’re gambling. I’ve had to explain to too many guys why their new control valve didn’t fit — they bought a <80> part for a <70> machine. The factory document shows the applicable model indicators right in the page headers: <70>, <80>, <<> for LCK, . Read them.

How to Use This Catalog for a Real Job

Say you need a holding valve for a mono boom cylinder on a ZAXIS 80. Go to the CYLINDER section. Find CYL.;BOOM [WITH HOLDING VALVE] [MONO BOOM]. The parts list shows the holding valve assembly with its own part number. Check the quantity column — that’s per cylinder. Then look at the service code column: if it has a D code, that part requires dealer modification. If it has a Y interchange, any earlier part number can be replaced with the listed one. Cross-check the serial number ranges in the foreword (Serial No. 060001~ for this catalog). If your machine falls outside that range, call Hitachi — you may need the updated catalog. The PARTS INDEX at the back (page 176) lets you look up any part name alphabetically. Keep this manual in the shop computer or tablet while you work. It’ll save you the trip to the dealer’s parts counter.

Factory Specs That Save Your Machine

This parts catalog does not contain torque values or fluid capacities — that’s in the service manual. But it does give you the exact part numbers for every seal, gasket, and O-ring in the hydraulic system. When you’re reassembling a piston pump, using the wrong backup ring causes internal leakage. The catalog lists each component of the ROTARY GROUP and CONTROL SPRING GROUP with factory quantities. It also includes the VALVE;REDUCING and REGULATOR subassemblies. For the travel motor, the VALVE;BRAKE <70,80,K> page shows the brake piston and spring — if you’re losing holding power on a grade, that’s where you start. The catalog’s notes on page 4 explain the W code (on-machine work required) and R code (quantity varies per machine, like shims). Pay attention to those. Skipping them gets you a machine that won’t track straight.

Related manuals you may need: HITACHI ZAXIS 70 80 Excavator Parts Catalog, Hitachi Sumitomo ZAXIS850-3 Series Parts Catalog – 451 Pages, Hitachi Sumitomo ZAXIS 600-650LCH Parts Catalog – 162 Pages. For a broader look at heavy equipment documentation standards, see the Automotive Industry Overview and also Automotive Industry Overview.

Frequently Asked Questions

Does this parts catalog include torque specifications?

No. That data is in the service manual, not the parts catalog.

Can I use this catalog for the ZAXIS 80 SBLC?

Yes. The catalog covers ZAXIS 80 SB and SBLC models under the indicator. Look for the mark in the page headers.

What do the codes ‘Y’, ‘I’, ‘P’ mean in the interchangeability column?

They come from the factory legend on page 4 and 5. Y means the replacement part is unconditionally interchangeable — use it without question. I means the new part can replace the old, but not vice versa. P means the listed part is prohibited; you must order the alternate part shown in the next column. There is also D for on-machine modification needed (usually a rework at the dealership), K for service kit inclusion, and # for newly listed parts. These codes prevent you from installing a part that will cause a hydraulic lock or a pressure mismatch. I’ve seen a P part installed on a swing motor because the tech didn’t look at the code — that motor locked up on the first swing. Read the codes.

How do I find the correct part for my machine’s serial number?

Check the foreword pages (look at the OCR excerpt: Serial No. 060001~). This catalog applies to machines with PIN starting from 060001. If your machine is older, you may need an earlier revision. Inside each section, look for D dates or H (device serial number) in the service code column. Those tell you when a part design changed. Always verify your machine’s PIN against the catalog’s applicability range before ordering.

Stop pulling part numbers from forum posts or third-party sites. Get the actual factory breakdown. Access the Factory Manual now and keep it on your tablet next to the machine. One wrong seal costs you a full day of labor. This catalog pays for itself on the first order.