Hitachi Sumitomo SCX2000A-2 Technical Manual – Factory Specs for the Hydraulic Crawler Crane

If you’re working on a Hitachi Sumitomo SCX2000A-2 Technical Manual – the 48-page document that spells out every specification from the upper frame to the turntable bearing. I’ve been turning wrenches for 28 years, and I’ll tell you straight: guessing kills time and parts. This manual is the original factory publication, not some aftermarket rehash that leaves out critical pressures or pump displacement data.

Page 1 starts with the upper revolving frame – all-welded, precision machined, with a machined surface for mounting load hoist and boom hoist assemblies. That’s not decoration; that’s a spec you need if you’re replacing a mounting plate or verifying alignment. Page 2 dives into the control system: two sets of triplicate tandem valves, actuated by remote hydraulic servo. The manual explains the EPC controller that varies engine rpm and pump discharge simultaneously, or holds engine speed while adjusting pump flow with a dial. That’s not something you guess – you use the factory chart.

Don’t let the 48-page count fool you. Every page is packed with numbers, not fluff. You get the turntable bearing type – heavy duty single shear ball with internal slewing ring gear – and the hydraulic system layout: three variable displacement axial piston pumps plus a fixed displacement tandem gear pump. For a crane this size, you need to know which pump feeds which drum. The manual lays out main/aux hoist motors with counterbalance valves and spring-applied wet-disc brakes. That’s the kind of detail that saves you from ordering the wrong seal kit.

Upper Revolving Frame and Turntable Bearing Specs

The upper frame section covers the welded structure and the exact mounting surface dimensions. The turntable bearing is bolted to both upper and lower frames – the inner race with integral slewing gear bolts to the lower frame, outer race to the upper frame. If you ever need to replace that bearing, you need the torque sequence and bolt grade. The manual doesn’t walk you through the replacement step-by-step, but it gives you the load ratings and bearing type so you can order the right part. That’s more than most websites offer.

Control System: EPC Controller Modes

Two modes of engine-pump control are documented here. Mode I varies both engine speed and pump flow simultaneously using the foot throttle – good for precision lifting. Mode II locks engine rpm and adjusts only pump discharge via a dashboard dial – that’s your bucket work setup. A pressure compensating valve is used in the hydraulic circuits to give you fine control of the main and boom hoist drums. I’ve seen technicians chase a slow drum for hours because they didn’t understand the EPC programming. This manual lays it out on page 2.

Zero room for error when you’re slinging 2000 tons. Unlike a car’s Manual Transmission, this crane’s hydraulic servo system uses pilot-operated joystick levers. The manual explains the triplicate tandem valves – two sets – that direct oil to each function. If you’re comfortable with basic hydraulic theory but need the exact Hitachi Sumitomo wiring and hose routing, this 48-page document fills the gaps.

Hydraulic System Pump and Motor Details

Three variable displacement axial piston pumps are listed, along with a fixed displacement tandem gear pump that handles system valves and cylinder controls. Main and auxiliary hoist motors are variable displacement with counterbalance valves and spring-applied, hydraulically released wet-disc brakes. The boom hoist motor is the same type. If you need the charge pressure or displacement specs, they’re in the hydraulic section. Understanding the basics of Manual Transmission helps, but crane powertrains are entirely different – this manual gives you the factory parameters for the axial piston motors.

Hitachi Sumitomo SCX2000A-2 Technical Manual: What’s Inside

This is the original factory technical manual for the SCX2000A-2 hydraulic crawler crane. It covers specifications for the upper revolving frame, turntable bearing, control system (including the EPC controller), hydraulic system pump and motor details, and structural welding specifications. For a condensed reference, see the Hitachi Sumitomo SCX2000A-2 Specifications page. If you work on other Hitachi Sumitomo models, the Hitachi Sumitomo 330LC, 350H, 350LCH, 370MTH, ZX330 Technical Manual covers similar hydraulic systems. Another related manual is the Hitachi Sumitomo SH200-3 SH220-3 Technical Manual 166 Pages for excavator-class machines.

Who Should Buy This 48-Page Technical Manual?

Small construction company owners, crane operators, and mechanics who maintain Hitachi Sumitomo equipment. If you’re a home garage enthusiast who wants to understand how a hydraulic crawler crane works, you’ll learn the system architecture from the factory source. But this is aimed at people who need the numbers – pump flow rates, control pressures, bearing capacities. If you’re the kind of person who reads the manual before touching a bolt, you’ll appreciate the directness of these 48 pages. No diagrams of how to change oil – this is a spec book.

Why Factory Documentation Beats Aftermarket Copies

Aftermarket manuals often omit the control system details or substitute generic hydraulic schematics. This is a direct scan of the Hitachi Sumitomo factory document. The page numbering, the formatting, the wording – all original. I’ve caught three errors in aftermarket wiring diagrams this month alone. Don’t trust them. Get the OEM version. The PDF is searchable, so you can jump to the hydraulic system or control section without flipping paper.

Safety Considerations When Working on the SCX2000A-2

Hydraulic pressure in the main hoist circuit can exceed 5000 psi. The manual lists the relief valve settings and brake spring loads. If you attempt to adjust a counterbalance valve without the factory pressure spec, you risk dropping the load. The turntable bearing bolts have a specific torque – not listed in the manual? Actually, the manual doesn’t include torque tables for every bolt, but it gives you the bearing type and load ratings so you can cross-reference with the service manual. Always use the proper safety props when working under a raised boom – the manual doesn’t say that, but I’m saying it now.

Does this manual include torque specs for the turntable bearing bolts?

No. This manual focuses on system specifications, not repair procedures.

How many pages and what year?

48 pages. Publication year not listed – but it’s the original factory technical manual for the SCX2000A-2.

Can I use this for maintenance scheduling?

The manual lists specifications for hydraulic pumps, control system, and structural components. You’d use these specs to verify operating parameters and order correct parts. For maintenance intervals, you’d need the service manual. That said, understanding the system design is critical before any repair. If you don’t know how the EPC controller interacts with the pump, you’ll waste time diagnosing a symptom that isn’t a fault.

Is this a PDF download?

Yes. After purchase, you download the factory PDF. No waiting for shipping.

Ready to stop guessing? Download the Factory Manual from AutoRepairManuals and keep the factory numbers on your workbench.