Description

Fiat-hitachi EX125WD-5 Parts Catalog – 267 Pages of Factory Parts Data

You are chasing a leak on an EX125WD-5. The swing motor brake valve is dripping. You pull the old part, read the number, but your aftermarket cross-reference shows three different options. Which one fits? Without a factory parts catalog, you gamble. That gamble costs you a return shipment and two hours of downtime. The Fiat-hitachi EX125WD-5 Parts Catalog eliminates that gamble. This is an OEM-issued document, 267 pages thick, covering every hydraulic component, power train assembly, and cylinder group. It is not a service manual—it is the parts bible. You use it to identify exact part numbers, understand supersessions, and see how assemblies break down. Every valve, every brake plate, every seal is listed with its factory number. No guessing.

PUMP SECTION: What the Parts Catalog Covers

Open to the PUMP section. You get PUMP DEVICE, PUMP UNIT, REGULATOR, and PUMP GEAR sub-assemblies. Each part is drawn with a callout number. The table lists part number, part name, quantity per machine, and service codes like R (quantity varies per unit) or D (must replace as assembly). Need the regulator solenoid? Look under REGULATOR. The diagram shows the valve body, plunger, and springs. This is not a generic illustration—it is specific to the EX125WD-5 pump serial number range 005101 and up. Cross-reference against aftermarket catalogs? I have seen those miss pump gear sizes by a tooth. Stick to the OEM sheet.

MOTOR AND VALVE: Swing, Travel, and Brake Components

Two sections cover the motor assemblies: MOTOR OIL (SWING) and MOTOR OIL (TRAVEL). Each includes a ROTARY GROUP, SHAFT PART, COVER PART, plus VALVE RELIEF, VALVE TIMER, and most importantly, VALVE BRAKE. That brake valve is what stops the swing from drifting when you shut off the pilot pressure. The catalog shows every shim, spring, and poppet. If you need the travel motor piston kit, the MOTOR PISTON subsection gives you the complete piston slipper assembly part number. You will also find VALVE SOLENOID entries repeated—six of them in the VALVE section. That is because the EX125WD-5 uses multiple solenoid valves for proportional control. Each solenoid has its own part number and quantity. Do not assume they are interchangeable. The factory says otherwise.

Brake and Steering Valves: Critical Safety Items

Under the VALVE section, you will find VALVE BRAKE listed twice—once as part of the motor circuit, and again as a separate assembly. The parking brake valve, the service brake shuttle valve, and the steering valve are all documented. One of the most overlooked items is the VALVE SLOW-RETURN. It controls the blade lower speed. If you replace it with a generic check valve, the blade drops too fast and you risk tipping the machine. The catalog gives you the exact spring rate and orifice size by part number. Do not shortcut safety items. Use the factory parts.

Cylinder Breakdown: Boom, Bucket, Blade, Outrigger

The CYLINDER section is massive. It covers CYL. BOOM (R) and (L) for both mono boom and offset boom configurations. Then ARM BOOM, CYL. BUCKET, CYL. CLAMSHELL, CYL. OFFSET, CYL. BLADE (R) and (L), CYL. OUTRIGGER (R) and (L), CYL. STEERING, and CYL. SUSPENSION. Each cylinder page lists the rod, piston, gland, seals, and wiper. The quantity column tells you how many per machine. For the offset boom, there are two different part numbers for the left and right cylinders. Swapping them? Look at the drawing—sometimes the port orientation is mirrored. The parts catalog keeps you from ordering the wrong side.

Power Train and Axle Assemblies

TRANSMISSION is broken into four sub-sections (1/4 through 4/4). It shows the input shaft, gears, clutches, and housing parts. Then AXLE FRONT and AXLE REAR, each with CARRIER, PLANETARY & HUB, and BRAKE sections. The brake assemblies for both axles are documented with friction discs, steel plates, and piston seals. You will also find the BRAKE section under ETC. for the air dryer and booster components. If you are dealing with a rear axle brake drag, you need the exact shim thickness for the planetary hub. The catalog lists the shim part numbers and thickness options. No aftermarket catalog does that.

Source Validity: OEM Print vs Aftermarket Cross-References

This is a genuine Fiat-hitachi parts catalog printed from the factory files. It includes the Product Identification Number range (Serial No. 005101~). Every page has Japanese and English text. The compatibility codes (I, P, T, Y) tell you if a part can be substituted forward or backward. Aftermarket catalogs often omit those codes or give you a single supersession number without explaining whether it is a one-way or two-way swap. I have been burned by that. Stick with the OEM document. The page count is 267—that is 267 pages of verified data, not 50 pages of generic diagrams. If you work on these machines, you need this file open on your tablet while you tear down the valve stack.

How This Parts Catalog Saves You Time

You are rebuilding a control valve bank. The EX125WD-5 uses a 10-section control valve (VALVE CONTROL 1/10 through 10/10). Each section has its own spool, spring, and plug. The catalog shows every section separately. You can identify which section is for boom, arm, bucket, offset, blade, outrigger, etc., by the callout numbers. When you order parts, you give the dealer the 8-digit part number. They ship it. No returns. The same applies to the swing motor brake valve—if you need the VALVE BRAKE for the travel motor, the part number is listed under both MOTOR OIL (TRAVEL) and the VALVE BRAKE subsections. Cross-check against each other to confirm you have the right revision.

FAQ: Common Questions About the EX125WD-5 Parts Catalog

Does this catalog include engine parts?

No. This is a hydraulic and chassis parts catalog. Engine components (fuel system, cooling, etc.) are covered in a separate engine manual.

Are the illustrations exploded views with part numbers?

Yes. Every assembly uses exploded line drawings with callout numbers that match the table. The table gives the part number, name, quantity per machine, and service codes. Page 26 shows the pump device. Page 73 shows the swing motor rotary group.

Can I use this to look up torque specs or repair procedures?

No. This is strictly a parts identification document. Torque values and disassembly steps are in the technical manual. We also sell the HITACHI EX125WD-5 Technical Manual for that purpose.

What format is the access?

PDF. The original scanned file is 267 pages, with searchable text for part numbers. You can save it to your phone, tablet, or laptop. No physical shipment.

Look, you already know the value of factory documentation. The HITACHI EX125WD-5 Parts Catalog is the same file the dealer uses to order parts. Pair it with the Fiat-hitachi 850-3, 850LC-3, 870H-3, 870LCH-3 Parts Catalog if you run a mixed fleet. For industry context, see the Automotive Industry Overview and Automotive Industry Overview for broader equipment standards. Access the Factory Manual now and keep your EX125WD-5 running with the right parts every time.