Komatsu N855 Series Diesel Engine Shop Manual • PN 09-84(01)10431, SEBE6710A03, September 1984
Komatsu Models Covered & Key Technical Specifications
Models: N-855-C, NT-855-C, NTA-855-C
Sub-models / Variants: PC300-1, PC300-2, PC300LC-1, PC300LC-2, D80A-18, D80E-18, D85A-18, D85E-18, D85P-18, D80F-18, D95S-2, PC400-1, PC400LC-1, W170-2, W180-1, W180-2, HD320-2, HD320-3, WS16S-2, WS23-1
Model Years: 1984
Serial Numbers: 26100001 and up
Technical Data:
- Engine Configuration: 6-cylinder, 4-stroke, water-cooled, direct injection
- Total Displacement: 14,010 cc
- Bore x Stroke: 139.7 mm x 152.4 mm
- Horsepower Range: 180 HP – 405 HP
- Cooling System Capacity: 43 L – 125 L
- Lubrication Oil Capacity: 43 L (Refill 38 L)
- Electrical System: 24V (Alternator 25A–35A, Starting Motor 11 kW)
- Firing Order: 1–5–3–6–2–4
Komatsu Manual Features & Content Preview
Komatsu N855 Series Diesel Engine Technical Documentation – Specs, Diagrams & Reference Tables
- Covers the Komatsu-Cummins N-855-C, NT-855-C, and NTA-855-C diesel engine series utilized in PC300-1, HD320-2, and D85A-18 platforms.
- Official 279-page Komatsu publication (SEBE6710A03), printed in Japan, dated September 1984.
- Includes 12 assembly-view schematics, 9 performance curves, and 4 comprehensive torque specification tables.
- Features a searchable OCR text layer to quickly locate specific repair reference data during shop-floor maintenance.
- Available as an instant download directly after checkout, stored permanently in your secure account.
- Serves as the foundational technical reference documenting the transition from early N-855 setups to the turbocharged and after-cooled NTA variants.
Important safety notice: Always ensure industrial machinery is fully powered down, locked out, and depressurized before inspecting engine components or comparing internal systems against these reference materials.
Internal System Documentation
This service manual details the exact technical descriptions for major engine subsystems. It breaks down the intake, exhaust, fuel, and lubrication systems to give mechanics a clear look at factory layouts. You will find precise structural outlines of the cylinder block, crankshaft, and timing gear assemblies. The publication documents the operational function of turbochargers and after-coolers. It also details the Cummins PT fuel pump and governor arrangements for various machine applications. Reference data is included for troubleshooting symptoms like reduced power, oil leaks, and abnormal hydraulic pressure. This provides undeniable clarity for daily workshop tasks. It strictly covers engine structure, function, testing, maintenance, and repair procedures.
Engine Specification Highlights
Specifications cover multiple variants across industrial and heavy equipment applications. The cylinder head intake valve clearance for Engine No. 26100001–26155791 is documented at 0.41 mm in the cold state. Standard tightening torque for a 12 mm thread diameter bolt is specified at 112 ± 9.8 Nm. The engine dry weight varies by specific model configuration, landing between 1,450 kg and 1,750 kg.
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