Description

Komatsu PC390LL-10 2013 Service Manual

You’ve got a PC390LL-10 in your bay. Maybe it’s a log loader, maybe it’s a road builder. Serial number A50601 or up, with the 6D114E-5 engine. You need to pull the swing motor, or you’re chasing a hydraulic drift issue, and the last thing you want is a stripped split flange bolt because you guessed the torque. I’ve been turning wrenches since before some of you were born, and I can tell you: a non-factory manual will get you in trouble. That’s why this Komatsu PC390LL-10 2013 Service Manual exists. It’s 332 pages of OEM documentation, not some aftermarket copy that’s missing the critical footnotes.

Audience Fit – Who Actually Needs This?

Home garage guys who think they can rebuild an excavator final drive with a YouTube video will burn through two sets of bearings before they realize the preload spec is on page 20-14. Professional techs: you’re billing by the hour, and guessing on CLSS pressure compensation valve adjustments is how you eat into your flat rate. Shop owners, your liability insurance hates undocumented repairs. This manual is for anyone who puts a wrench on a PC390LL-10 and wants to do it right the first time. The PC390LL-10 has a CLSS hydraulic system – Load Sensing with pressure compensation. If you’ve ever had a boom that drifts down overnight, the troubleshooting section (chapter 40) isolates the drift prevention valve without replacing parts you don’t need.

Standard Tightening Torque: Why the OEM Table Matters

Page 00 of the foreword includes a full table of tightening torque for bolts and nuts, hose nuts, split flange bolts, flared nuts, O-ring boss joints, and taper seal hoses. The manual even breaks it down by engine series – for the 102, 107, and 114 series (your 6D114E-5 falls into the 114). I’ve seen aftermarket manuals list one torque for “hydraulic fittings” – that’s how you snap an O-ring boss plug and dump hydraulic oil all over your floor. The OEM table gives you the exact numbers for each joint type. Follow it.

CLSS Hydraulic System: What the Manual Covers

Structure and Function chapter (10) dives deep into the CLSS. It covers the main pump with LS valve, PC valve, and LS(PC)-EPC valve. You get the control valve breakdown: unload valve, LS pressure introduction, pressure compensation valve, shuttle valve, boom and arm regeneration circuits, merge-divider valve, and the travel junction valve. The manual walks you through the swing motor holding brake and the suction 2-stage safety valve. Need to understand the arm drift prevention valve for the log loader variant? It’s right there, separate from the road builder.

Push Pull Coupler Procedures – Type 1, 2, and 3

The foreword includes a section on the push pull coupler – disconnection and connection steps for three different types. If you’ve got a quick-attach coupler on your machine and it’s not locking right, you need the factory procedure. Aftermarket manuals often say “loosen the bolts and reconnect” – that’s how couplers fail under load. The 2013 edition includes torque specs for the coupler mounting bolts in the standard tightening torque section. Not guessing.

Does This Manual Cover the Engine?

Yes. The engine is the 6D114E-5, and the manual covers engine-related parts and cooling system in chapter 10. You won’t find a full engine rebuild section because that’s covered in a separate engine shop manual, but you get the hydraulic and powertrain interaction that matters for diagnostics. For example, the manual includes the powertrain system with the swing circle and final drive – that’s where you’ll find the gear backlash specs and bearing preload if you’re rebuilding a final drive.

3 Reasons to Choose OEM Documentation

First, the torque tables are specific to Komatsu hardware – an aftermarket manual might tell you 150 ft-lbs for a split flange bolt, but the OEM spec could be 185 ft-lbs depending on the bolt grade. Second, the wiring diagrams in chapter 90 are color-coded with the exact wire codes from the machine harness. Third, the troubleshooting chapter (40) is built around the CLSS system logic – something that aftermarket books dumb down into generic “check for pressure” advice. If you want to avoid buying a new main pump because you misadjusted the LS-EPC valve, buy the real manual.

Source Validity – What You’re Getting

This is a factory PDF, printed September 2013 by Komatsu America Corp. It is proprietary material – not to be reproduced without authorization. The serial number range is PC390LL-10 A50601 and up. The document is 332 pages, watermarked, and every page matches the original binder. No reprints, no third-party scans. The table of contents lists chapters 00 through 90, including testing and adjusting (30), disassembly and assembly (50), maintenance standard (60), and air conditioning (80). You get the hoisting instructions, electric wire code classification, conversion tables, and coating materials schedule. Everything you need to service this machine correctly.

FAQ – Common Questions

How many pages is the manual, and what years does it cover?

332 pages. It covers the 2013 model year, serial number A50601 and up. For earlier serial numbers, you’d need a different edition.

Does it include torque specs for the swing motor mounting bolts?

The standard tightening torque tables cover bolts and nuts for the entire machine. You’ll find the torque for socket head bolts and flanged bolts in the table – apply to the swing motor based on bolt size and grade. The manual doesn’t explicitly list every bolt individually, but the table covers all metric fasteners used on the PC390LL-10.

Is this manual for the road builder, log loader, or both?

Both. The manual covers road builder and log loader configurations. Working ranges, dimension drawings, and drift prevention valve adjustments differ between the two – the manual separates them in the hydraulic circuit diagram section. You’ll see specific valve adjustments for each variant.

Does the manual include wiring diagrams?

Yes. Chapter 90 – Diagrams and Schematics – includes the full electrical schematic with wire color codes and connector pinouts. The electric wire code section in the foreword explains how to read the codes by thickness and color.

Related Manuals You Might Need

• Demag Komatsu H 285 S Service Manual – 544 Pages of Factory Specs
• Komatsu WA430-6 Service Manual – 306-Page OEM Shop Manual
• Komatsu WA470 2000 Service Manual – Factory Specs for Wheel Loaders

For other equipment with traditional Manual Transmission systems, you’ll want a different service manual – this one covers the powertrain final drive, not a road gearbox. Similarly, if you work on older machines with non-CLSS hydraulics, check the Manual Transmission page for our archive.

You’ve read the details. You know what’s in it. If you’re going to put a wrench on a PC390LL-10, do it with the factory data. Access the Factory Manual now and get back to earning your hourly rate.