Description

Fiat-hitachi EX400-5, EX450H-5 Parts Catalog – Factory Documentation for Your Excavator

I’ve seen a lot of guys burn a Saturday because they ordered the wrong O-ring for a control valve. A misread part number on a third-party list, and the machine sits dead. That’s why I keep factory parts catalogs on the bench. This Fiat-hitachi EX400-5, EX450H-5 Parts Catalog runs 110 pages and comes straight from Hitachi’s own documentation. Page 1 shows the serial number range (07356~) and the cold district spec. That tells you exactly which machines this applies to. If your excavator falls outside that range, you need to cross-check.

PUMP Section: Piston Pump and Regulator Breakdown

The pump section covers the piston pump, regulator, reducing valve, and the tilting-probing unit. You also get the gear pump exploded view. Each assembly has item numbers that match the parts list. When you’re rebuilding the hydraulic pump, having the exact part number for the regulator spool or the piston shoe saves you from ordering a whole assembly you don’t need. The exploded diagrams show orientation and stacking order – critical when you’re reassembling under the cab on a hot San Antonio afternoon. HITACHI EX400-5 EX450H-5 Parts Catalog is the file you want for this machine.

Motor Oil Sections: Swing, Travel, and Brake Valve

Under MOTOR ; OIL you’ll find the swing motor section, then motor oil 1/2 and 2/2. The brake valve is listed right after motor oil 2/2 as VALVE ; BRAKE. That’s a separate assembly – don’t confuse it with the main control valve. If your machine won’t hold position on a slope, you’re likely looking at that brake valve. The parts catalog gives you the correct seal kit and spring numbers. Page numbers for the brake valve section are not printed on every page, but the bookmark structure takes you straight there. Fiat-hitachi 850-3, 850LC-3, 870H-3, 870LCH-3 Parts Catalog provides similar coverage for smaller machines.

VALVE Section: Control Valve, Pilot Valves, and Accessories

This is where most of the work happens. The control valve is split into five sheets – 1/5 through 5/5. You have pilot valves for front & swing, travel, FC valve, shuttle valve, solenoid valve, check valve, and lock valve. Then come the cylinders: boom right, boom left, arm, bucket, and bucket long arm. Each cylinder has a dedicated exploded diagram. When you’re replacing a boom cylinder seal, the part number for the rod wiper is in that section. Do not trust aftermarket catalogs that try to lump all cylinders into one generic diagram. Fiat-hitachi ZX50U-2 Parts Catalog – 120 Pages of OEM Specs shows how the same attention to detail applies to smaller excavators.

7 Major Sections Organized for Fast Part Lookup

The catalog divides into pump, motor oil, valve, and etc. (which includes the DP sensor). Each section has its own exploded views and corresponding parts index. At the back, the PARTS INDEX lets you find any part number alphabetically or numerically. That index alone saves hours of flipping. For industry context on how part numbering systems work, check Automotive Industry Overview. For manufacturing standards that affect replacement part consistency, refer to Automotive Industry Overview.

Why You Need This Catalog on the Bench

Aftermarket parts catalogs often reuse old drawings or skip the cold district variants. This is the original Hitachi print – Russian preface and all. The part numbers match what Hitachi ships today. If you’re maintaining an EX400-5 or EX450H-5 for a fleet or a private job, you avoid the “I think this is the right spool” problem. The brake valve section, control valve sheets, and motor oil breakdowns are all from the same source. No guesswork.

FAQ

Does this catalog include torque specs for the brake valve?

No. This is a parts catalog, not a service manual.

How do I find the correct part number for the control valve spool?

Use the parts index at the back. Each assembly has an item number on the exploded diagram. Match that to the part number in the list. The control valve is split into five sheets (1/5 through 5/5) so make sure you have the correct sheet for your valve section. If you order the wrong spool, the machine won’t shift properly. Also verify your machine serial number – the catalog applies to EX400-5 and EX450H-5 with serial numbers 07356~ and cold district spec. If your machine is outside that range, your part numbers may differ because Hitachi sometimes updates components mid-production. Cross-reference with your machine’s serial plate before ordering any valve components.

Can I use this catalog for the EX400-5 with a different attachment?

Standard equipment only. Long arm bucket cylinder is listed separately. Verify.

What is the difference between the two motor oil sections (1/2 and 2/2)?

1/2 covers the swing motor and part of the travel motor; 2/2 completes the travel motor. Both must be referenced for a full travel motor rebuild.

Bottom line: if you’re rebuilding hydraulics on a Fiat-hitachi EX400-5 or EX450H-5, you need the factory part numbers. Aftermarket lists cost you time and money. Access the Factory Manual now and keep it in your tablet or printed binder. You’ll thank me when the control valve comes apart clean and every part number matches.