Description

Komatsu WA350-1 Workshop Manual – What You Actually Get

If you are turning wrenches on a Komatsu WA350-1, you already know that aftermarket documentation is a gamble. I have seen guys lose a whole afternoon because a third-party diagram had the wrong oil passage routing. This Workshop Manual is the factory print – 781 pages of the same binder that Komatsu issued to their dealer techs. It covers the S6D110-1 engine, the full Manual Transmission powertrain, steering, brakes, work equipment, and the electric system. No reprints, no condensed versions, no missing torque tables.

Engine Overhaul Coverage – Valve Clearance and Fuel Injection Timing

Section 10 ENGINE is where you live if you are pulling a cylinder head. The manual walks through adjusting valve clearance with the exact feeler gauge sizes and sequence – not a generic “tighten to spec” line. It also covers testing and adjusting fuel injection timing, so you can set the pump timing without guessing. Fuel cut solenoid adjustment is in there too. Need the standard value table for compression pressure? It is listed. The “Standard Value Table” under section 12 gives you the numbers for oil pressure, blow-by pressure, and exhaust gas color. Every spec came from Komatsu’s test stand.

Fuel System – Injection Pump and Nozzle Holder R&R

Removing the fuel injection pump assembly on a WA350-1 is not a job you want to do twice. This manual dedicates full pages to the removal and installation of the injection pump, nozzle holder assembly, and the fuel tank. It tells you the torque for the injection pump mounting bolts and the high-pressure line connections. If you are swapping injectors, the nozzle holder section shows the correct tightening angle. Do not rely on a generic diesel manual – the Komatsu S6D110-1 has specific port timing that changes with the pump orientation.

Transmission Diagnostics – Emergency Manual Spool and Troubleshooting Tables

Section 20 POWER TRAIN covers the torque converter, transmission, transfer, and axles. The troubleshooting table on page 22-? lists four common failures: machine does not move, lacks power or speed, excessive time lag when shifting, and high torque converter oil temperature. Each condition has a step-by-step diagnostic flow. The emergency manual spool procedure is documented – if the solenoid valve fails, you can shift manually without pulling the control valve. For guys running Komatsu WA65-5 WA70-5 WA80-5 2005 Workshop Manual, this same troubleshooting structure applies, but the WA350-1 has different torque converter relief valve settings and a different accumulator valve setup. Know what you are working on.

7 Systems Covered – From Steering to Electric

The manual does not stop at the engine and drivetrain. Sections 40 (Steering), 50 (Brake and Air), 60 (Work Equipment), 80 (Electric and Electronic), and 90 (Others) cover the hydraulic steering system, air-over-hydraulic brakes, bucket and lift circuits, and the full electrical wiring diagrams. The gear pump section (97) includes disassembly and assembly of the hydraulic charge pump. This is especially useful when you have low pilot pressure and need to check the gear pump clearance without calling in a hydraulics specialist.

Is This Manual Right for Your Shop or Garage?

If you own a WA350-1 loader, or you are a mobile heavy equipment tech who sees these machines regularly, this manual is your primary reference. The audience is anyone who puts hands on the machine – not the operator, but the mechanic. DIY owners who do their own maintenance will appreciate that the tool list for testing and adjusting (section 12) tells you exactly what gauges and adapters you need. No guesswork about whether you need a 0-300 psi gauge versus a 0-1000. For a deeper dive into similar models, check Komatsu WH609-1E0 WH613-1E0 WH713-1E0 WH714H-1E0 WH716-1E0 Workshop Manual or Komatsu PW95R-2 Workshop Manual – 520 Pages of Factory Specs. Each one follows the same OEM structure, but the specs are model-specific. Cross-referencing is fine, but use the right manual for the right machine.

OEM Print vs. Aftermarket Reproductions

I have seen third-party manuals that copy the table of contents but leave out half the hydraulic circuit diagrams. This Komatsu manual is the original OEM file – the same one that goes into the dealer service bay. The page numbering matches the factory binder (00-1, 12-1, etc.). The wiring diagrams are not redrawn, they are scanned from the original. Aftermarket books often blur the numbers or remove the harness connector views. If you need to trace a short in the transmission solenoid circuit, you need the actual OEM pinout – not a generic wiring schematic. That is why this manual exists.

What Torque Values Are Listed?

The maintenance standards sections (24, 44, 54, 64) contain tables with torque specs for every fastener on the machine: transmission mount bolts, torque converter charging pump, differential carrier bolts, final drive, and axle housing. These are not ballpark numbers from a general tightening chart. Each value comes from Komatsu’s engineering tolerances. For example, the torque for the transmission control valve body bolts is different from the solenoid valve bolts. If you skip the spec and guess, you either strip the threads or get internal leaks. I have seen both.

Does the manual cover the S6D110-1 engine in full detail, or do I need a separate engine manual?

This manual covers the engine as installed in the WA350-1. It includes structure and function, testing/adjusting, and disassembly/assembly. For deeper internal rebuild specs (crankshaft bearing clearances, piston ring gaps), Komatsu recommends the separate 110 Series Engine Shop Manual. This one gives you everything needed for in-frame overhauls, valve adjustments, and fuel system work.

Can I use this manual for a WA350-1 with a serial number below 10001?

No. The manual explicitly states “10001 and up.” Earlier machines may have different transmission control valve configurations and different wiring harnesses. Using the wrong specs can cause transmission shift issues or electrical shorts. Always match your serial number range.

Stop wasting billable hours on incomplete information. If you are doing a valve adjustment, fuel pump timing, or transmission rebuild on a Komatsu WA350-1, get the factory document. Access the Factory Manual from AutoRepairManuals and put it on your tablet or workstation – it is a PDF that you can search, zoom, and print. No watermarks, no missing pages, no guesswork.