Description

Hitachi Sumitomo SCX400 Technical Manual

If you’re maintaining or operating a Hitachi Sumitomo SCX400, you don’t guess at load charts or hydraulic pressures. I’ve seen guys try to run a 40-ton crawler crane with specs pulled off a forum – and that’s how booms fold and people get hurt. This 20-page Technical Manual is the factory-issued document you need on the bench, not a reprint or a scanned copy from some third party. It’s the original OEM file (HitachiSumitomo_SCX400_Technical_Manual_en-31113016300.pdf), and it gives you the numbers Hitachi Sumitomo designed the machine around.

Engine Specs and Hydraulic Data from Page 4

You need the ISUZU 4HK1X engine power? Page 4. Rated power: 147 kW at 2100 min⁻¹ (net per DIN 6271). Maximum torque: 688 N·m at 1500 min⁻¹. Piston displacement: 5.19 L. Fuel tank: 300 L. Electric system DC 24 V. The manual also describes the dual hoist mechanisms – independent main and auxiliary drums driven by hydraulic motors. Page 4 gives you the full technical description, not a summary. You want the hoist wire rope speed? It’s 74 m/min for main/aux hoisting and lowering – but that varies with load, and the manual tells you that in a note. No guesswork.

Load Charts and Working Ranges – EN Rating

This manual covers the SCX400-C3 model with maximum lifting load of 40 metric tons at 3.7 m radius. Basic boom length 10 m, maximum 46 m. The Rated Loads sections for Main Boom (EN Rating) and Jib Boom (EN Rating) are on pages 9 and 10. Working ranges start on page 7. If you’re setting up a lift, you need those tables. Page 3 also includes ground contact pressure (52.8 kPa, 0.54 kgf/cm²) and travel speed (1.9 km/h). These are the numbers an engineer signed off on. Don’t use aftermarket approximations.

Clamshell and Dragline Configurations

Not every job uses the boom and hook. This manual covers clamshell and dragline setups: dimensions, specifications, working ranges, and bucket data on pages 14 and 15. If you’re swapping attachments, you’ll find the standard/optional equipment list on page 16. The component weights and transport dimensions are on page 18 – critical when you’re moving the machine on a trailer and need to know if you’re over legal axle loads.

3 Sections That Save You From Costly Mistakes

• Technical Description (page 4): Explains the hydraulic system layout, hoist drum design, and engine integration. No guesswork on line routing.
• Crane Boom Construction / Fly Jib Construction (page 17): Shows the actual pinning sequence and component weights for building up the boom. If you skip a pinning step, you’re risking a collapse.
• Dimensions (page 3): Overall machine dimensions with crawlers retracted and extended. You need these to know if you can fit through a gate or onto a low‑bed.

Who Should Buy This Manual?

Small fleet owners who operate a single SCX400 on construction sites. Mobile crane techs who do field repairs. DIY operators who bought a used machine and need the factory specs to keep it safe. This is not a general hydraulics book – it’s the Hitachi Sumitomo document for the SCX400. If you’re a home garage guy working on a pickup truck, this isn’t for you. But if you’re responsible for a 42.8‑ton crawler crane, you need this on your tablet or printed out.

Source Authenticity: OEM vs. Aftermarket

I have a rule: if the page doesn’t have “HITACHI SUMITOMO” and a part number on it, I don’t use it for torque specs or load ratings. Aftermarket manuals (the kind that copy from multiple sources) often transpose the load chart for a different boom length. This manual is the original 20‑page factory file. It even notes that all “ton” in the catalog are metric tons – a detail that gets lost in reprints. You can cross‑reference the wire rope diameters (22 mm main, 16 mm boom hoist) against what’s actually on your machine. Don’t trust a third‑party transcription.

Does this manual include step-by-step repair procedures?

No. This is a technical specifications manual – it covers dimensions, load charts, engine specs, and component weights. It does not contain disassembly or overhaul steps.

What formats are available?

You receive a digital PDF of the original factory file. It is 20 pages, all text and tables are searchable. You can print it or use it on a tablet in the cab. No reprints, no watermarks – just the OEM document as published by Hitachi Sumitomo.

You’ve read the specs. You know the risks. Get the factory data that matches your machine’s serial number. Access the Factory Manual now and keep it where you can reach it before every lift.

• Related Manual: Hitachi Sumitomo SCX400 Hydraulic Crawler Crane Specifications”>Hitachi Sumitomo SCX400 Hydraulic Crawler Crane Specifications
• Related Manual: Hitachi Sumitomo 330LC, 350H, 350LCH, 370MTH, ZX330 Technical Manual”>Hitachi Sumitomo 330LC, 350H, 350LCH, 370MTH, ZX330 Technical Manual
• Related Manual: Hitachi Sumitomo SH200-3 SH220-3 Technical Manual 166 Pages”>Hitachi Sumitomo SH200-3 SH220-3 Technical Manual 166 Pages

External reference: Manual Transmission”>Manual Transmission (for general knowledge on driveline components – not crane-specific). Manual Transmission”>Manual Transmission.