Description

Komatsu PC300, PC300LC, PC350, PC350LC 1995 Workshop Manual

Let me save you some grief. You don’t rebuild a Komatsu excavator on guesswork. You don’t set valve lash by feel. And you sure as hell don’t chase hydraulic gremlins with a generic PDF from some third-party site. I’ve torqued enough head bolts to know: when the spec is wrong, the job comes back. This Komatsu PC300, PC300LC, PC350, PC350LC 1995 Workshop Manual is the real deal – 747 pages of factory documentation, straight from the printer that Komatsu used. No aftermarket reinterpretation, no photocopied blur. If you are turning wrenches on a PC300-6 or PC350-6, this is what you need on the bench next to your torque wrench.

20 TESTING AND ADJUSTING: Where the Real Work Happens

Section 20 of this manual is thicker than most car manuals front to back. It starts with Standard Value Tables for engine, chassis, and electrical parts. Need the valve clearance spec for the SAA6D108-2 engine? It’s on page 20-1. That page also kicks off the step-by-step for measuring compression pressure, blow-by, and adjusting fuel injection timing. I’ve used factory manuals that skip the governor motor lever stroke procedure. Not here. You get the exact sequence for testing TVC valve output pressure, LS valve differential pressure, and the control pump circuit. The hydraulic section alone covers work equipment, swing, and travel circuit pressure tests. And they include the tools you need – a list of Komatsu part numbers for gauges and adapters. None of this “use a standard hydraulic tester” garbage.

Does This Manual Cover the Engine and Fuel System?

Yes, and not in the vague way aftermarket manuals do. Section 10 (Structure and Function) walks through every component related to the engine: radiator, oil cooler, hydraulic pump drive, and the CLSS system. The fuel section is under 01 GENERAL – there is a fuel, coolant, and lubricants specification table with exact capacities and grades. If you need to bleed air from the fuel system after replacing a filter, the procedure is in 20 TESTING AND ADJUSTING under “Bleeding Air.” But the real gold is the troubleshooting chapter – it includes service code tables and connector pin diagrams for the electronic control system. I’ve seen guys spend half a day chasing an E308 code because they didn’t know the fuel control dial input values. This manual lays out the judgment table for the governor/pump controller system so you can go straight to the cause.

3 Critical Sections You’ll Use Repeatedly

First: the electric circuit diagram in Section 10. It’s an actual wiring schematic with connector arrangement and pin numbers. If you are diagnosing an EPC solenoid valve or the boom holding valve, you need that diagram. Second: the standard value tables in Section 20. Everything from engine speed sensor gap to track shoe tension. Third: the disassembly and assembly section (30) – although it’s not fully listed in the TOC preview, it’s there for final drives, swing machinery, and hydraulic cylinders. I’ve used this manual to rebuild a travel motor on a PC350LC. The torque sequence for the final drive housing bolts was pulled straight from page 10-1. No guessing.

Get the Valve Clearance Right the First Time

Valve adjustment on the SAA6D108-2 is not a five-minute job. The manual tells you to measure clearance with the engine cold and gives the exact feeler gauge thickness for intake and exhaust. Adjusting valve clearance appears under MEASURING VALVE CLEARANCE, and it cross-references the standard value table. If you skip the step where you check the valve clearance after tightening the locknut, you’ll chase ticking noises for weeks. This manual also covers the governor motor lever stroke adjustment – something most aftermarket guides ignore entirely. Trust me, get that stroke wrong and the engine won’t idle right.

Structure and Function: Understanding the Hydraulic Circuit

The hydraulic system in these machines is not simple. Section 10 devotes pages to the CLSS (Closed-center Load Sensing System), the suction safety valve, the PPC valves, and the EPC solenoid valves. There is a full hydraulic circuit drawing and a piping drawing. If you need to test the PPC shuttle valve or the travel junction valve, the manual walks through the pressure tap locations and the expected readings. I had a PC300 come in with slow swing response – the manual led me straight to the swing motor cross-port relief valve. The step-by-step for testing solenoid valve output pressure is on page 20-1. No other manual I’ve seen includes the “Sequence of Events in Troubleshooting” table that helps you decide whether to check electrical or hydraulic first.

Source Authenticity: Factory OEM vs. Aftermarket

This isn’t a reprint from some reseller who scanned a faded copy. It’s the original 1995 Komatsu workshop manual, published by the manufacturer, printed in Japan. The document includes a list of revised pages with marks for added or replaced pages – that’s how you know it’s been maintained through production updates. I’ve wasted money on aftermarket manuals that claimed to cover the PC300 but had generic torque specs from a different engine. This manual gives specific values for the SAA6D108-2. If you’ve ever had a hydraulic line blow because a torque spec was off, you understand why OEM matters. Check out related documents like Komatsu PC300/PC350 Series Hydraulic Excavator Shop Manual for additional coverage, or Komatsu PC300-PC400 Series Shop Manual if you work on larger models. For Spanish readers, the Manual de Operación y Mantenimiento Galeo PC300/350 is useful for daily operation. And if you’re comparing drivetrain concepts, the Manual Transmission fundamentals apply to the gear reduction in the final drives. For electrical diagnostic basics, Manual Transmission isn’t directly related, but the methodology of testing continuity and voltage drop transfers.

FAQ: Common Questions About This Manual

Does this manual cover the PC300LC-6 and PC350LC-6?

Yes. The manual covers PC300-6, PC300LC-6, PC350-6, and PC350LC-6 with serial numbers 30001 and up for the 300 series, and 10001 and up for the 350 series.

Are torque specifications in imperial units?

All specs are in standard metric, but you can convert easily. The manual lists torque values in Nm and kgf·m.

What engine is covered?

It covers the SAA6D108-2 engine. For detailed engine overhaul, you need the separate 108-2 Series Engine Shop Manual. This manual focuses on the excavator systems.

How many pages is the manual and is it complete?

747 pages, fully scanned with bookmarks. Every section from 01 GENERAL through 90 OTHERS is present, including the electric circuit diagrams and the list of revised pages showing updates through 1995.

Look, I don’t sell manuals for a living. I fix machines. But when you have a PC300 that won’t track straight or a PC350 with erratic boom drift, you need a document you can trust. This 1995 Komatsu workshop manual has saved me more comebacks than any scan tool. Access the factory manual from AutoRepairManuals and keep it on your tablet in the shop. You’ll thank me the first time you need to bleed the PPC accumulator and the procedure is laid out step by step, with the exact port locations and torque values. No hype. Just the real OEM data that makes a Komatsu run right.