Searching for the exact exploded views for your engine rebuild? This 80-page 3TNE68-NTB, TB014, TB016 parts catalog PDF breaks down every assembly for these compact powerplants. Inside, you get detailed diagrams showing the precise order of components for the fuel injection pump, crankshaft, and cooling water system. Open to any section and find complete part numbers for everything from the main bearings to the governor weight assembly. Locate the correct 0.5 KG oil pressure switch or verify the shim pack arrangement for your fuel injection valve before placing a parts order. Stop ordering the wrong components from confused dealers. Grab this bookmarked file on your tablet, look up the exact OEM part, and get your excavator back to work.
What's Inside This Yanmar 3TNE68 Series Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 5-6 | Block Assy, Cylinder, Plug, Bolt, Main Bearing, Gasket, Cyl. Head |
| Gear Housing | 7-8 | Gear Case Assy, Oil Seal, Lub. Oil Pump, Cover, Hydraulic Pump, Ball Bearing |
| Flywheel Housing & Oil Sump | 9-10 | Housing, Flywheel, Oil Seal, Sump Assy, Oil, Drain Plug, Gasket, Liquid |
| Cylinder Head & Bonnet | 11-12 | Cylinder Head & Bonnet Parts, Exploded Parts Diagram, Part Numbers, Quantities |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Oil Pressure Switch Activation | 0.5 KG | p. 21 |
Yanmar 3TNE68 Series Common Problems This Manual Covers
Yanmar 3TNE68-NTB hard starting when hot, losing power under load, or stalling out p. 31
Inspect the fuel line exploded view on page 31 to identify replacement filter elements. Verify part numbers for the water separator and joints. Ensure the engine maintains adequate lubrication by checking the oil pressure switch on page 21, which activates at 0.5 KG.
Manual Section: Fuel LineSafety cut-out shutdown from rapid overheating and coolant leaks around the front cover p. 23
Review the cooling water system diagrams on page 23 to locate the correct water pump assembly. Cross-reference the thermostat and sub-tank part numbers. Confirm the oil pressure switch, rated for 0.5 KG activation, is functioning to prevent secondary engine damage during overheating events.
Manual Section: Cooling Water SystemHeavy white smoke on startup and weak cylinder compression after thousands of operating hours p. 37
Check the gasket set component list on page 37 for the complete cylinder head gasket. Match the valve stem seals and O-ring part numbers to your build. Replace the 0.5 KG oil pressure switch if you suspect internal lubrication drops caused the cylinder wear.
Manual Section: Gasket Set & ToolsRough running and abnormal engine knocking indicating poor combustion or severe nozzle fouling p. 29
Locate the fuel injection valve assembly breakdown on page 29. Identify the correct nozzle assembly and required shim pack sizes. Order genuine replacement parts to restore proper injection spray patterns and keep the engine running safely above the 0.5 KG oil pressure warning limit.
Manual Section: Fuel Injection ValveFrequently Asked Questions
What are the replacement specifications for fuel filters?
The manual identifies the fuel filter as part number 119255-55620, listed as "STRAINER, FUEL" with a quantity of 1. This information is found in the "FUEL LINE" section on page 31 for the 3TNE68-NTB engine.
How do you fix 3TNE68-NTB hard starting when hot, losing power under load, or stalling out?
Inspect the fuel line exploded view on page 31 to identify replacement filter elements. Verify part numbers for the water separator and joints. Ensure the engine maintains adequate lubrication by checking the oil pressure switch on page 21, which activates at 0.5 KG.
How do you fix safety cut-out shutdown from rapid overheating and coolant leaks around the front cover?
Review the cooling water system diagrams on page 23 to locate the correct water pump assembly. Cross-reference the thermostat and sub-tank part numbers. Confirm the oil pressure switch, rated for 0.5 KG activation, is functioning to prevent secondary engine damage during overheating events.
How do you fix heavy white smoke on startup and weak cylinder compression after thousands of operating hours?
Check the gasket set component list on page 37 for the complete cylinder head gasket. Match the valve stem seals and O-ring part numbers to your build. Replace the 0.5 KG oil pressure switch if you suspect internal lubrication drops caused the cylinder wear.
What format is this 3TNE68-NTB & variants manual in?
This is a 80-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Are there any print restrictions on this 3TNE68-NTB & variants manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
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