All 42 pages of this Yanmar TB145 4TNV88-QTB Parts Catalog cover one engine family in three configurations: QTB(cab), QTB1 canopy, and the full TB145 compact excavator application. Inside, exploded-view figures walk every major assembly: cylinder block, gear housing, flywheel housing and oil sump, crankshaft and piston, lubrication system, fuel injection pump with inner parts and governor detail, fuel injectors, starting motor, generator, and a complete gasket set. You get factory part numbers and cross-references for each component, from main bearing sets and camshaft gearing down to individual O-rings, valve stem seals, and delivery valve assemblies. The cooling system diagram notes thermostat opening temperature at 82°C: the kind of embedded factory data that confirms this is the OEM source document, not a reprint. Ordering the wrong part means two days of waiting. Bookmarked by assembly, this PDF lets you search any part name and land on the right figure in seconds.
What's Inside This Yanmar 4TNV88-QTB(cab) / QTB1(canopy) Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 5-6 | Block Assy, Cylinder, Plug, Bush, Camshaft, Main Bearing Set, Gasket, Cyl. Head |
| Gear Housing | 7-8 | Gear Case Assy, Plug, Seal, Oil, Cover Assy, Pump, Valve, Relief |
| Flywheel Housing & Oil Sump | 9-10 | Parallel Pin, Housing, Flywheel, Cap, Flywheel Cover, Spacer, Oil Sump, Sump Assy |
| Cylinder Head & Bonnet | 11-12 | Hed Assy, Cylinder, Guide, Valve, Intake |
| Suction Manifold & Air Cleaner | 13-14 | - |
| Exhaust Manifold & Silencer(cab) | 15-16 | - |
| Exhaust Manifold & Silencer( for QTB1)(canopy) | 17-18 | - |
| Camshaft & Driving Gear | 19-20 | - |
| Crankshaft & Piston | 21-22 | Crankshaft Assy, Gear, Piston Assy, Ring Set, Connecting Rod, Piston Pin |
| Lub.Oil System | 23-24 | Dipstick, Pipe Assy, Lub. Oil, Cooler Assy, Oil, Filter, Joint Bolt |
| Cooling Water System | 25-26 | Pump Assy, Water, V-Pulley, Fan, Cooling, Thermostat, Radiator Assy |
| Fuel Injection Pump | 27-28 | Pump Assy, F. Inject, Support, Fip, O-Ring, Solenoid, Stop |
| Fuel Injection Pump (Inner Parts) | 29-30 | Valve Assy, Dilevery, Timer Set, Piston, Damper Assy, Pump Assy, Feed |
| Governor (Inner Parts) | 31-32 | Packing, Case, Lever, Regulator, Bolt, Idle Limit, Screw, Adjust |
| Fuel Injection Valve | 33-34 | Fuel Injector, Nozzle Assy, Holder Assy, Nozzle, Spring, Pipe Assy, Injection |
| Fuel Line | 35-36 | Bracket, Filter, Pipe Assy, Fuel Oil, Fuel Pump, Separator Assy, Element |
| Starting Motor | 37-38 | Shaft, Pinion, Armature Assy, Ball Bearing, Coil Assy, Field, Brush, Pinion Assy |
| Generator | 39-40 | Alternator, Rotor Assy, Ball Bearing, Flame Assy, Drive, Pulley, Regulator Assy |
| Gasket Set | 41-42 | Gasket, Cyl. Head, O-Ring, Seal, Valve Stem, Exh. Manifold |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Thermostat opening temperature | 82 | p. 26 |
Yanmar 4TNV88-QTB(cab) / QTB1(canopy) Common Problems This Manual Covers
Yanmar TB145 fuel filter, water separator, and element part numbers for scheduled replacement p. 35
Check the Fuel Line exploded view on page 35. The filter assembly, fuel pump, separator assembly, and replaceable element are catalogued as separate line items. Identify each component in the exploded view, then match part numbers to your serial number range in the parts list before ordering — separator bodies and filter elements carry different part numbers and are not interchangeable.
Manual Section: Fuel LineWater pump assembly and impeller part numbers for cooling system service p. 25
Open the Cooling Water System diagram on page 25. The pump assembly, V-pulley, fan, thermostat, and radiator assembly are all listed individually. The thermostat replacement spec is 82°C opening temperature — confirm any sourced part matches this value. Cooling component part numbers continue on page 26; cross-reference both pages before placing an order to catch associated seals and fittings.
Manual Section: Cooling Water SystemFuel injector nozzle and holder assembly part numbers for a single smoking cylinder p. 33
Turn to the Fuel Injection Valve section on page 33. The nozzle assembly, holder assembly, nozzle, return spring, and injection pipe assembly are each itemized separately in the exploded view. Identify the specific failed component before ordering — the nozzle and holder carry distinct part numbers and are not sold as a single unit in this catalog.
Manual Section: Fuel Injection ValveCorrect exhaust manifold part number — unsure whether cab or canopy configuration applies p. 15
This manual separates exhaust parts by body type. For the QTB(cab) variant, use the Exhaust Manifold & Silencer diagram on page 15. For QTB1 canopy models, turn to page 17. The two sections list different part numbers for the manifold and silencer — confirm your model designation on the machine dataplate before ordering to avoid receiving incompatible components.
Manual Section: Exhaust Manifold & Silencer(cab)Starting motor brush set and pinion assembly part numbers for a no-crank fault p. 37
Refer to the Starting Motor exploded view on page 37. The armature assembly, ball bearings, field coil assembly, brush set, and pinion assembly are all catalogued as individual line items on page 38. Locate the failed component in the exploded view first — ordering the full starter assembly when only the brush set or pinion is worn adds unnecessary cost.
Manual Section: Starting MotorComplete head gasket set part numbers including O-rings and valve stem seals p. 41
Check the Gasket Set section on page 41. The cylinder head gasket, O-rings, valve stem seals, and exhaust manifold gasket each carry their own part number and are listed separately. Decide whether to order individual gaskets or the full set before pulling parts — both options are catalogued, and the exploded view identifies which seals belong to which subassembly.
Manual Section: Gasket SetFrequently Asked Questions
What are the replacement specifications for fuel filters?
The manual lists the fuel filter with part number 119802-55800 and the filter element with part number 119802-55710. These parts are found in the Fuel Line section of the catalog.
What are the replacement specifications for air filter?
The air cleaner assembly has part number 129612-12681 or 129612-12691. The outer element for the air cleaner is listed with part number 119808-12520. These components are detailed in the Suction Manifold & Air Cleaner section.
How do you fix yanmar TB145 fuel filter, water separator, and element part numbers for scheduled replacement?
Check the Fuel Line exploded view on page 35. The filter assembly, fuel pump, separator assembly, and replaceable element are catalogued as separate line items. Identify each component in the exploded view, then match part numbers to your serial number range in the parts list before ordering. Separator bodies and filter elements carry different part numbers and are not interchangeable.
How do you fix water pump assembly and impeller part numbers for cooling system service?
Open the Cooling Water System diagram on page 25. The pump assembly, V-pulley, fan, thermostat, and radiator assembly are all listed individually. The thermostat replacement spec is 82°C opening temperature; confirm any sourced part matches this value. Cooling component part numbers continue on page 26; cross-reference both pages before placing an order to catch associated seals and fittings.
How quickly can I access this Yanmar TB145, 4TNV88-QTB(cab), QTB1(canopy)?
A 42-page Parts Catalog in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Can I print this Yanmar TB145, 4TNV88-QTB(cab), QTB1(canopy), QTB1 (canopy)?
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 is a scanned document with an OCR layer, allowing you to search and copy text. The text quality is fair; while OCR is present, the original scanned text can appear slightly blurry or faded in places. Diagrams and illustrations are raster images, and their labels are generally readable, though some fuzziness may be present at higher zoom levels. Pages show typical scan artifacts, minor skewing, and occasional smudges from the original physical document. All pages contain content.
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