Komatsu PC300-8M0, PC350LC-8M0 Crawler Excavator Shop Manual (UENBM00410)

These Komatsu PC300-8M0, PC350LC-8M0 Crawler Excavators are mid-size machines used for bulk earthmoving, trenching, and heavy lifting on construction and quarry sites. The Shop Manual is what working techs and serious trainees grab when a fault code pops up, a component has to come off the machine, or a rebuild is on the schedule. People use this kind of book when they’re past “daily checks” and deep into “why is this circuit acting up?” territory. If you’re trying to actually fix and reassemble, not just operate, you’re looking in the right lane.

What this manual helps you do

• Trace hydraulic and electrical faults on PC300-8M0 and PC350LC-8M0 machines using step-by-step diagnostic flow-type procedures.
• Check disassembly and reassembly sequences for major components like the swing system, travel system, and front attachment so parts go back in the right order.
• Follow engine, hydraulic, and cooling system testing procedures to confirm whether a component is actually bad before you replace it.
• Diagnose control system and sensor issues by using wiring information and expected signal behavior, which is where students usually misread circuits.
• Handle adjustments and post-repair checks so you don’t create new problems with incorrect settings or missed inspections.

Who this is for

This Shop Manual is aimed at field technicians, shop mechanics, and serious trainees working on Komatsu PC300-8M0 and PC350LC-8M0 crawler excavators. If you’re mainly an operator or fleet manager just wanting daily maintenance and safety info, you’d be better off with the Operation and Maintenance Manual instead.

FAQ

Q: Is this a PDF I can download and search?

A: Yes, it’s a PDF you can download, search by keyword, and print selected pages for use in the shop.

Q: Is the detail level right for full overhauls?

A: The Komatsu PC300-8M0, PC350LC-8M0 Crawler Excavator Shop Manual walks through diagnostic procedures, disassembly sequences, and reference data for workshop-level repairs, so it’s suited to full component work.

Q: How do I know if it matches my exact machine variant?

A: This manual is identified as book number UENBM00410; you should match that to the documentation list for your specific serial number range from your dealer or machine paperwork.

Bottom line: if you’re repairing or teaching repair on these exact Komatsu PC300-8M0 or PC350LC-8M0 crawler excavators, this is the right manual; if you just need basic operation and daily service info, keep looking for the O&M book instead.

Table of Contents:

• Rev_15.book(UEN06259-02
• UEN06273-00_A2.pdf
  • Hydraulic circuit diagram
• UEN06274-00_A2.pdf
  • Electrical circuit diagram
  • Electrical circuit diagram
  • Electrical circuit diagram
  • Electrical circuit diagram
  • Electrical circuit diagram
• UEN06274-00_A2.pdf
  • Electrical circuit diagram
  • Electrical circuit diagram
  • Electrical circuit diagram
  • Electrical circuit diagram
  • Electrical circuit diagram

Komatsu