Description

Hitachi Sumitomo SCX800-2 Technical Manual

Look, I’ve spent most of my life under hoods and around heavy equipment. When you need the factory specs for a Hitachi Sumitomo SCX800-2, you don’t want some aftermarket copy that left out the pressure settings. This Hitachi Sumitomo SCX800-2 Technical Manual is the real deal – 24 pages of OEM data, straight from the manufacturer. No third-party interpretation. You get the specifications for the upper revolving frame, turntable bearing, control system, and the hydraulic circuit that keeps this crane working.

Specifications Overview of the Hitachi Sumitomo SCX800-2 Technical Manual

Pages 1 and 2 lay out the upper revolving frame construction – all-welded, precision machined. The turntable bearing is a single shear ball type with an integral internal slewing gear bolted to the lower frame. These aren’t generic bullet points. This is the exact spec the factory used to build the superstructure. If you’re rebuilding or inspecting, you need these dimensions and bolt patterns.

Does This Manual Cover the Control System?

It does. Page 2 details the entire control system, including the quadruplicate and triplicate tandem valves that direct oil to various machine functions. The EPC controller gives you two modes: Mode I varies engine speed and pump discharge simultaneously for precision crane work; Mode II holds engine RPM fixed and varies pump discharge alone – that’s for clamshell or duty cycle operations. There’s a specially-tailored pressure compensating valve to get fine control on the drum circuits. Generic manuals skip this. This one doesn’t.

That section alone saves you from chasing hydraulic gremlins for hours. Know what you’re adjusting.

3 Key Sections in the Hydraulic Data

First, the pump system: three variable displacement axial piston pumps for independent and combined operations, plus one fixed displacement duplicate tandem gear pump for valve and cylinder controls. Second, the motor specs on page 3 – main/auxiliary crane hoist motors are fixed displacement axial piston with counterbalance valves; the boom hoist motor has a spring-applied/power hydraulically released multiple wet-disc brake. Third, the travel motors are shoe-in design variable displacement with brake valves. All OEM numbers, no guesswork.

Use the Factory Torque Specs for Assembly

When you’re torquing the turntable bearing bolts or the hydraulic motor mounts, you need the factory values. Those are in this manual. Don’t rely on a Chilton or Haynes equivalent for a 200-ton crawler crane. Aftermarket torque tables can be off by 20% – that’s how you snap bolts or get leaks. The OEM document is your only reference.

EPC Controller: Two Operating Modes Explained

Mode I is the default – twist the motorcycle-style grip and engine speed climbs with pump flow. Perfect for lifting where you need feathering. Mode II locks engine RPM at full throttle while you modulate pump flow through the grip. That’s for clamshell work where you want constant engine speed. The manual spells out the logic so you can diagnose controller faults. Page 2 has the hydraulic circuit diagram for the servo controls.

Audience Fit: Who Really Needs This Manual

If you’re a shop owner quoting a repair on an SCX800-2, you need the spec sheet to order the right seals and filters. If you’re a field mechanic adjusting the counterbalance valves, you need the pressure settings. If you’re a crane operator wanting to understand why the EPC behaves a certain way, this is your read. Beginners will find the specifications section a solid overview – but if you’ve never worked on hydraulic crawlers, pair this with hands-on training. The manual assumes you know the basics, but it gives you the numbers.

For related models, check the Hitachi Sumitomo 330LC, 350H, 350LCH, 370MTH, ZX330 Technical Manual. Also look at the Hitachi Sumitomo SH200-3 SH220-3 Technical Manual 166 Pages and the Hitachi Sumitomo SH240-5 Technical Manual – Factory OEM Specs for more hydraulic excavator data. The control system design here shares concepts with a Manual Transmission hydraulic clutch assist, and the pump control logic is comparable to that in a Manual Transmission drive system – though scaled up considerably.

Source Validity: OEM vs Aftermarket

This is an original factory technical manual from Hitachi Sumitomo. The OCR text on page 1 reads “HITACHI SUMITOMO SCX800-2 HYDRAULIC CRAWLER CRANE Specifications – ASIAN ISSUE.” That’s the real thing. Aftermarket sellers often reprint third-party summaries with missing pages or copied data. This PDF is a direct scan of the factory document. You get the exact wording the engineers wrote. That matters when you’re troubleshooting a system that uses quadruplicate tandem valves – one mislabel and you’re ordering the wrong part.

What specific models does this manual cover?

Hitachi Sumitomo SCX800-2 hydraulic crawler crane.

Does this manual include torque specifications?

Yes, the manual provides OEM torque values for critical fasteners, including those on the turntable bearing and hydraulic motors. Page 3 lists the brake specifications for the boom hoist motor.

How is this manual different from generic aftermarket guides?

Generic aftermarket guides often omit crucial details like the EPC controller programming modes, the pressure compensating valve settings, and the exact pump displacements. This OEM manual gives you the exact factory specs – the control system section on page 2 describes the quadruplicate and triplicate tandem valves, the EPC controller modes, and the specially-tailored pressure compensating valve. Without that data, you’re guessing. With this manual, you have the reference the factory technicians used. The difference is the difference between a repair that holds up and one that leaks.

Can I use this manual for training new operators?

Absolutely. The specifications section provides a complete overview of the machine’s construction, making it useful for both mechanics and operators.

24 pages of factory data, no filler. If you’re working on one of these cranes, stop relying on incomplete information. Hit the button and Access the Factory Manual now.