Description

Fiat-hitachi ZAXIS 800, ZAXIS 850H Parts Catalog – 212 Pages of Factory Specs

I’ve been turning wrenches for 28 years, and I can tell you the difference between a job that goes smooth and one that eats your whole weekend often comes down to one thing: having the right part number before you pull the old piece off. You order a control valve based on a blurry photo from an aftermarket site, you get the wrong subplate, and suddenly your machine sits for three days while you wait on the next shipment. That’s why you want the Fiat-hitachi ZAXIS 800, ZAXIS 850H Parts Catalog – 212 pages of OEM part data straight from the factory. No translations, no “compatible with” listings, no guesswork.

Pump, Motor, and Valve Coverage – 212 Pages of OEM Data

This catalog breaks down the major hydraulic systems into sections you can actually navigate. The PUMP section covers piston pumps, regulators, reducing valves, the tilting-probing unit, and gear pumps. Under MOTOR you get the swing motor and travel motors (split into 1/2 and 2/2 for each). The VALVE section is the meat of the book – control valves in five parts each for two different configurations, pilot valves for front/swing, travel, loader, breaker, plus solenoid, shuttle (five sub-sections), lock, FC, check, and holding valves for boom and arm. If you’ve ever had a valve spool stick because you grabbed the wrong pilot cartridge from a generic bin, you understand why having the exact factory part number matters. I’ve seen guys slap a aftermarket shuttle valve into a ZAXIS 800 and lose all pilot pressure – that’s a costly mistake this catalog prevents.

Why Use the Factory Parts Catalog for Hydraulic Repairs?

Because the aftermarket catalogs I’ve looked at don’t carry the detail you see here. The VALVE section alone has 27 separate subcategories – CONTROL (five sheets for one variant, five for another), PILOT (front/swing, travel, loader, breaker), SOLENOID, SHUTTLE (five sheets), LOCK, FC, CHECK, HOLDING (boom, arm bottom, arm rod). Each entry lists the part number, quantity per machine, and compatibility codes (Y for unconditional, I for interchangeable, P for prohibited). When you’re rebuilding a ZAXIS 850H that’s down in the pit, you don’t have time to decode “fits many models” – you need the number that matches your serial number. The catalog even marks D (changeover date) and H (machine serial number) so you know exactly when a part was superseded.

3 Sections That Save You from Ordering the Wrong Part

First, the CYLINDER section: boom (right and left), arm (standard, HD, BE), bucket (multiple variants), plus loader cylinders – arm, bucket right/left, level, dump, and a lift cylinder subsection. Each cylinder assembly is exploded with individual parts listed. Second, the PARTS INDEX at the back lets you cross-reference by part number if you have an old one in hand. Third, the compatibility notes (W, D, K, R, S, OP, OS, US, #, Y, I, P) tell you if a part needs field modification, is oversize, or is banned from use. I had a helper once order a “compatible” holding valve for a boom cylinder – it was undersize and the boom dropped like a rock. This catalog would have shown the US (undersize) notation and steered him to the standard part.

Get the Right Valve: Control, Pilot, Shuttle – 27 Variants Listed

You want a shuttle valve for a ZAXIS 850H? This catalog lists shuttle valves in five separate pages (1/5 through 5/5) plus an additional single-page entry. That’s because different circuits – travel, swing, attachment – use different cartridges. The CONTROL valve section has two separate five-page runs, each covering a different configuration (likely standard and high-pressure). If you’re replacing a pilot valve on a loader, you get the exact PILOT (LOADER) subsection. Every valve has a part number, illustration, and quantity. No guessing, no “call for availability”. For general background on hydraulic systems, you can check the Automotive Industry Overview on Wikipedia, but for actual part numbers, stick to this catalog.

Cylinder Section: Boom, Arm, Bucket, and Loader

The CYLINDER section starts with boom cylinders for backhoe – right and left. Then arm cylinders (standard boom, BE boom, HD boom). Bucket cylinders for standard, HD, semi-long arm, BE boom/arm, long arm. Loader side gets its own arm, bucket (right and left), level, dump, and the C/W LIFTING cylinder. Each cylinder assembly shows the rod, piston, seals, and mounting brackets with their own part numbers. If you’re rebuilding a ZAXIS 800 bucket cylinder, you get the exact seal kit number, not a “universal” kit that might leak after 50 hours. I’ve seen too many jobs where a guy used a metric O-ring from a mix box and the gland nut loosened – that doesn’t happen when you pull the right number from this catalog.

Does this catalog include repair procedures or torque specs?

No. This is a parts catalog, not a service manual. It gives you part numbers, quantities, and compatibility. For torque values and assembly steps you need the factory service manual.

How do I find the correct part number for a control valve on my ZAXIS 850H?

Go to the VALVE section, then VALVE ; CONTROL. There are ten pages total – five for one configuration and five for another. Check your machine serial number against the D (changeover date) notes in the margin. If you have the old part, use the PARTS INDEX at the back to look up the number. The index lists every part number alphabetically and tells you which page to find it on. Match the quantity and note any compatibility symbols (Y, I, P) – if it says P, that part is prohibited and you must use the alternate number listed in the replacement column. For general manufacturing context, the Automotive Industry Overview may be of interest, but for the actual part you need, stay with the catalog.

If you also work on other Hitachi models, check out the HITACHI ZAXIS 800 ZAXIS 850H Parts Catalog (yes, that’s this one), and for similar era machines, the Fiat-hitachi 850-3, 850LC-3, 870H-3, 870LCH-3 Parts Catalog or the Fiat-hitachi ZX50U-2 Parts Catalog – 120 Pages of OEM Specs. Each of those catalogs follows the same factory format – no aftermarket reprints, no generic diagrams. You open the PDF, find your machine serial range, and you get the right part number. That’s how you keep a machine running, not guessing. Access the Factory Manual now and stop wasting time on parts that don’t fit.