Official Yanmar 4TNV98CT-WTBZ Parts Catalog (OEM #YOOF2161) covering 50 pages of exploded-view diagrams and numbered part callouts for the common-rail diesel engine used in Takeuchi TB280 compact excavators. Sections cover cylinder block, gear housing, flywheel housing, cylinder head, suction and exhaust manifolds, DPF assembly, camshaft, and complete gasket sets. Every figure maps directly to part numbers so you identify and order the exact component before touching the machine.
What's Inside This Yanmar 4TNV98CT-WTBZ (TB280) Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 6-7 | Camshaft Bush, Thrust Bearing, Main Spare Parts Bearing, Under-Sized Part Bearing, Thrust Over-Sized Part Bearing |
| Gear Housing | 8-9 | Oil Pump Assy, Filler Cover, Pipe, Oil Seal, Cover |
| Flywheel Housing & Oil Sump | 10-11 | Cap, D115/95XT11 Seal, Oil Sump Assy, Pin |
| Cylinder Head & Bonnet | 12-13 | Valve Cap, Intake Valve, Exhaust Valve, Valve Spring, Spring Retainer, Valve Stem Seal, Injector Gasket, Arm Support Assy |
| Suction Manifold | 14-15 | Stud, Bolt, Clamp, Washer |
| Exhaust Manifold | 16-17 | 12X1 Gasket, EGR Cooler Gasket, Gasket, Stud |
| Diesel Particulate Filter (DPF) | 18-19 | Silencer Gasket, Bolt, Nut |
| Camshaft & Driving Gear | 20-21 | Tappet, Push Rod, Thrust Bearing, Idle Gear Assy, Idle Gear Spare Parts Bush |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main Bearing Undersize | 0.25 US | p. 7 |
| Thrust Bearing Oversize | 0.25 OS | p. 7 |
| Flywheel Housing Oil Seal Dimension | D115/95XT11 | p. 11 |
| Exhaust Manifold Bolt Grade | M10x95, Grade 10.9T | p. 17 |
| EGR Cooler Bolt Grade | M8x50, Grade 10.9 | p. 17 |
| DPF Bolt Grade | M8x28, Grade 10.9T | p. 19 |
| Crank Pin Bearing Undersize | 0.25 US | p. 25 |
| Piston Assembly Oversize | 0.25 OS | p. 25 |
| Piston Ring Assembly Oversize | 0.25 OS | p. 25 |
| Lub. Oil Line Joint Bolt Thread | M10x1.5 | p. 29 |
| Cooling Water V-Belt Size | B 44.5 | p. 31 |
Yanmar 4TNV98CT-WTBZ (TB280) Common Problems This Manual Covers
4TNV98CT-WTBZ exhaust manifold gasket set needed after elbow replacement, EGR cooler and temp sensor gasket positions unclear in catalog p. 16
Turn to the Exhaust Manifold diagram on page 16. Gaskets are listed individually for the manifold face, EGR cooler, and exhaust temp sensor positions, not as a combined kit. When ordering replacement manifold hardware, confirm bolt spec M10x95 Grade 10.9T (page 17) to avoid mismatched fasteners. Cross-reference all gasket part numbers in the index before placing the order.
Manual Section: Exhaust ManifoldWater pump impeller and thermostat part numbers unclear, cooling hose assemblies not individually labeled in the diagram p. 30
Check the Cooling Water System diagram on page 30. The pump assembly, thermostat, cooling fan, and hose assemblies are listed as separate line items, not bundled together. Verify the drive belt part number against V-belt size B 44.5 on page 31. Cross-reference each hose assembly description against your engine configuration in the parts index before ordering.
Manual Section: Cooling Water SystemDPF assembly part numbers stalled after filter service interval, temperature sensor and gasket listing shows two overlapping sub-assemblies p. 18
Go to the DPF section on page 18. The DPF assembly, silencer, temp sensors, and case are cataloged as individual line items, not a combined replacement kit. Confirm DPF fastener hardware against the M8x28 Grade 10.9T bolt specification on page 19. Use the parts index to verify correct quantities for each sensor and gasket position before ordering.
Manual Section: Diesel Particulate Filter (DPF)Piston assembly oversize part numbers needed for cylinder rebore, unclear whether rings and bearings are stocked as a kit p. 24
Find the Crankshaft & Piston diagram on page 24. Piston assemblies, ring assemblies, and connecting rod assemblies are listed as separate line items. The parts list on page 25 shows the 0.25 OS oversize option for both piston assemblies and ring assemblies; order both separately to match your rebored cylinder. Check to confirm crank pin bearing undersize (0.25 US) part numbers as well.
Manual Section: Crankshaft & PistonFlywheel housing oil seal part number needed after rear crankshaft leak, two seal listings in the housing section look identical p. 10
Locate the Flywheel Housing & Oil Sump diagram on page 10. Two seals appear in this section: the rear crankshaft oil seal and the sump area seal. Identify the correct rear crankshaft seal by cross-referencing dimension D115/95XT11 on page 11 to confirm bore size before ordering. Use the index to avoid confusing it with the oil sump drain plug O-ring.
Manual Section: Flywheel Housing & Oil SumpTurbocharger lube return line part numbers unclear, pipe assemblies in the oil line section show overlapping descriptions p. 28
Check the Lub. Oil Line diagram on page 28. Pipe assemblies are labeled by function: Lo pipe, T/C return, and valve assemblies. Locate the turbocharger return pipe specifically by the 'Lo Return T/C' description in the parts list. Joint bolt fittings on this system use M10x1.5 thread per page 29, which confirms the correct connection type when cross-referencing the replacement hose or pipe assembly.
Manual Section: Lub.Oil LineFrequently Asked Questions
How do you fix exhaust manifold gasket set needed after elbow replacement, EGR cooler and temp sensor gasket positions unclear in catalog?
Turn to the Exhaust Manifold diagram on page 16. Gaskets are listed individually for the manifold face, EGR cooler, and exhaust temp sensor positions, not as a combined kit. When ordering replacement manifold hardware, confirm bolt spec M10x95 Grade 10.9T (page 17) to avoid mismatched fasteners. Cross-reference all gasket part numbers in the index before placing the order.
How do you fix water pump impeller and thermostat part numbers unclear, cooling hose assemblies not individually labeled in the diagram?
Check the Cooling Water System diagram on page 30. The pump assembly, thermostat, cooling fan, and hose assemblies are listed as separate line items, not bundled together. Verify the drive belt part number against V-belt size B 44.5 on page 31. Cross-reference each hose assembly description against your engine configuration in the parts index before ordering.
How do you fix DPF assembly part numbers stalled after filter service interval, temperature sensor and gasket listing shows two overlapping sub-assemblies?
Go to the DPF section on page 18. The DPF assembly, silencer, temp sensors, and case are cataloged as individual line items, not a combined replacement kit. Confirm DPF fastener hardware against the M8x28 Grade 10.9T bolt specification on page 19. Use the parts index to verify correct quantities for each sensor and gasket position before ordering.
How do you fix piston assembly oversize part numbers needed for cylinder rebore, unclear whether rings and bearings are stocked as a kit?
Find the Crankshaft & Piston diagram on page 24. Piston assemblies, ring assemblies, and connecting rod assemblies are listed as separate line items. The parts list on page 25 shows the 0.25 OS oversize option for both piston assemblies and ring assemblies; order both separately to match your rebored cylinder. Check to confirm crank pin bearing undersize (0.25 US) part numbers as well.
What do I get after purchasing this 4TNV98CT-WTBZ manual?
Instant PDF download. You get the full 50-page searchable Parts Catalog immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Am I able to print pages from this 4TNV98CT-WTBZ manual?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
Document Quality
This document is a mixed-format PDF, primarily consisting of scanned pages with an added OCR layer, allowing you to search and copy text. The text quality is generally crisp and readable, though some minor OCR artifacts are present from the scanning process. All diagrams and illustrations are raster images; they are clear for identification, and their labels are readable. The pages are clean with no noticeable scan artifacts or skewing, and there is one blank "Memo" page included.
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