Description

New Holland Kobelco SK310, SK310LC Workshop Manual – 918 Pages of Factory Specs

You’ve got a New Holland Kobelco SK310 or SK310LC sitting in the yard, and you’re about to tear into it. Maybe the swing motor’s leaking, or the control valve is sticking. Without the factory Workshop Manual, you’re guessing. And guessing on a 30-ton excavator costs real money. I’ve seen guys snap bolts because they used a generic torque chart. Don’t be that guy. This is the real OEM document – 918 pages of Japanese engineering data, not some aftermarket rewrite.

Electrical System: Factory Wiring and Troubleshooting

Look at the LC25 section. That’s the Electrical System chapter – covers every connector, sensor, and solenoid on the SK310 and SK310LC. Need to trace a no-start condition? The wiring diagrams are there, with component locations. I’ve used this manual to diagnose a failed pressure switch on a travel pedal without replacing a single part. You get the test procedures from the Maintenance Standard (LC04) – voltage drops, resistance checks, the works. Don’t waste hours with a multimeter and a prayer.

Hydraulic Pump and Control Valve Specs

Section 12 (Hydraulic Pump) and section 13 (Control Valve) give you the guts of the hydraulic system. The manual tells you the shim thicknesses, the relief valve settings, and the O-ring part numbers. When I rebuild a main pump, I clamp the manual open to page 73 for the bearing preload – it’s that specific. And the Control Valve section shows the internal passages so you know which port does what. Aftermarket manuals skip these diagrams because they’re hard to scan. This one doesn’t.

Does This Manual Cover the Cooler and Travel Systems?

Yes. The LC26 Cooler System and LC18 Travel System are fully documented. The travel system includes the reduction units (section 21) and the hydraulic motors (section 15). For background on gear ratios used in the reduction units, see Manual Transmission on Wikipedia – it’s the same concept. The cooler system section gives you the fan drive torque specs and the oil cooler flow rates. If the machine’s overheating, start there.

918 Pages of Component Breakdown

Every major component gets its own section. You’ve got Swivel Joint (16), Other Valves (14), Hydraulic Cylinder (17), and Engine (50). The cylinder disassembly procedure includes the rod gland torque sequence – no more guessing the pattern. And the Engine section covers the specific diesel used in these machines. I’ve used this manual to time a fuel injection pump correctly, something you cannot trust to memory. The page count – 918 – is not padded. It’s dense, with tables for standard man-hours (LC08) and working standards (LC07) so you can quote a repair time with confidence.

Maintenance Standards: What You Need to Know

LC04 is where the real value lives. It’s the Maintenance Standard and Test Procedure – the bible for checking clearances, pressures, and wear limits. You’ll find torque values for every bolted joint, from the track frame to the boom cylinders. Don’t trust the third-party stuff that reads “tighten securely.” Factory documents put numbers on it. The manual also lists the weight of components (LC03) so you know what sling you need. Safety warnings are printed on page 2 – read them. I’ve seen guys lift a swing drive with the wrong strap.

Who Needs This Manual?

If you own an SK310 or SK310LC and do your own maintenance, this is the tool you keep in the shop. Same for small equipment shops that service these excavators. Real-world use case: rebuilding a hydraulic motor. You need the internal clearance specs and the assembly order – section 15 covers it. You’ll also need the electrical test values from LC25 when the joystick controller acts up. DIYers with some experience can handle the work, but only if they have the right data. Beginners should read the Operation section first (though that’s in the operator’s manual – this workshop manual assumes you know how to run the machine).

Source Authenticity: OEM vs. Aftermarket

This is a factory-issued document from New Holland Kobelco, not a scan of a scan. The publishing code is S5LC0006E. I’ve been a tech for 28 years, and I’ve wasted time on aftermarket manuals that reverse the wiring colors or omit the last step of a valve adjustment. This manual has the original KOBELCO branding and the warning labels exactly as they appear on the machine. It’s the same manual the dealer parts counter uses. If you’ve ever argued with a service advisor about a torque spec, this ends the argument.

FAQ

Is this manual for both the SK310 and SK310LC models?

Yes. One manual covers both. The LC designation just means long track. All systems are the same.

Does it include torque specs for the swing reduction unit?

Yes, in the LC04 Maintenance Standard section you’ll find all torque values for bolts and fittings, including the swing reduction unit. The manual covers the swing frame (LC15) and reduction unit (section 21) in detail – backlash settings, bolt grades, and the sequence for tightening the swing motor mount. This is where aftermarket manuals get it wrong – they often round to the nearest 10 ft-lbs. This manual gives exact figures.

Can I use this manual for electrical diagnostics on the SK310LC?

Absolutely. The LC25 Electrical System section includes wiring diagrams, component locations, and diagnostic procedures for the entire machine – from the alternator to the control panel.

Is the manual in English?

Yes, original OEM English. No translation errors.

Related Manuals

• New Holland Kobelco SK310, SK310LC Workshop Manual – 918 Pages of Factory Specs
• New Holland Kobelco SK60 2017 Workshop Manual – 779 Pages of Factory Specs
• New Holland Kobelco SK330LC-6E, SK330NLC-6E, SK330-6E 2003 Workshop Manual

For additional reading on how reduction units and transmissions work, check Manual Transmission on Wikipedia. It’s not specific to the SK310, but the principles apply to the travel drive.

If you’re tired of guessing and want to get the job done right the first time, access the Factory Manual from AutoRepairManuals. You’ll have the same information the dealer techs use.