This 412-page Takeuchi TB23R Compact Excavator Workshop Manual (OEM #CD5E000) covers the full machine: general specifications, machine configuration (drive, slew, travel, upper frame), hydraulic units (pump, control valve, solenoid and pilot valves), and complete troubleshooting for travel, slew, boom and arm circuits. It also bundles the full service manual for the machine's Yanmar 3TNV70/3TNV76 diesel engine (teardown, rebuild, fuel injection, timing). Wiring and hydraulic schematics are included for tracing faults on the TB23R.
What's Inside This Takeuchi TB23R Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 5-18 | Safety Precautions, Cautions During Disassembly and Assembly, Cautions During Removal and Installation of the Hydraulic Units, Cautions During Removal and Installation of Piping |
| Specifications | 19-44 | Names of Components, Dimensions, Lifting Capacities, Specifications Tables, Mass Tables, Recommended Lubricants, Servicing Standards, Standards for Judging Performance |
| Machine Configuration | 45-98 | Drive System, Slew System, Travel System, Upper Frame, Control System, Attachments, Hydraulic System, Electrical System |
| Hydraulic Units | 99-224 | Hydraulic Pump, Control Valve, Solenoid Valve, Pilot Valve, Cylinder, Travel Motor, Slew Motor, Swivel Joint |
| Troubleshooting | 225-274 | Overall Machine, Machine Travel, Slewing, Boom, Arm, Bucket, Boom Swing, Dozer Blade |
| Engine (Bundled Yanmar 3TNV70/3TNV76) | 275-412 | Engine Removal and Installation, Cylinder Head, Pistons and Crankshaft, Fuel Injection, Cooling and Lubrication (Bundled Yanmar Engine Service Manual) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Oil filter tightening torque | 20 to 24 N•m (2.0 to 2.4 kgf・m) | p. 310 |
| Applicable oil filter Part No. | 119305-35150 | p. 310 |
| Cooling water volume in an engine | 0.6 liter | p. 404 |
| Fuel injection nozzle pressure (Standard) | 11.8 to 12.8 Mpa (120-130 kgf/cm²) | p. 324 |
| Fuel injection nozzle pressure (New fuel nozzle adjustment) | 0.5 MPa (5 kgf/cm) higher than the standard value | p. 324 |
| Lube oil and filter replacement interval | every 250 hours operation from 2nd time and on | p. 317 |
| Air blowing pressure for cleaning air cleaner element | 0.29 to 0.49 MPa (3.0 to 5.0 kgf/cm²) | p. 318 |
| Diaphragm assy inspection interval | every 1000 hours or 2 years | p. 322 |
| Cooling water replacement interval | at least once a year | p. 321 |
| Oil filter replacement | Replace the lube oil and the filter before the engine running. | p. 332 |
| Air filter cleaning | Clean. | p. 336 |
| Compression pressure (2TNV70, 3TNV70) | 3.24 ± 0.1 MPa (33 ± 1 kgf/cm²) | p. 337 |
Takeuchi TB23R Common Problems This Manual Covers
Yanmar TB23R engine overheating with coolant loss after 30 minutes of operation
Shut down and let it cool, then confirm there is coolant in the engine per the check on page 332. Top off and pressure test the system for external leaks at the water pump seal and hoses. On 2TNV70 equipped units the cooling water volume is 0.6 liter, so a low-by-half reading usually means a slow leak, not just evaporation. Replace coolant at least once a year per page 321 if it's overdue.
Manual Section: Vi . Engine p. 332Loss of power and rough running under load
Pull each injector and bench test nozzle opening pressure against the standard of 11.8 to 12.8 MPa listed on page 324. Any nozzle testing low or dribbling instead of atomizing cleanly is fouled or worn and should be rebuilt or swapped. Check fuel filter and lines for restriction before condemning injectors; a starved IDI system mimics the same rough-running, low-power symptoms.
Manual Section: Vi . Engine p. 324Excessive oil consumption or blue exhaust smoke
Run a compression test on all cylinders. On 2TNV70 and 3TNV70 engines the standard is 3.24 ± 0.1 MPa with a service limit of 2.55 MPa, per the spec table on page 337. Any cylinder below limit or showing more than 0.2 to 0.3 MPa deviation from its neighbors points to worn rings or bad valve guides rather than a fuel or turbo issue. Pull the head to inspect ring lands if readings are low across the board.
Manual Section: Vi . Engine p. 337Hard starting in cold weather even with functional glow plugs
Remove and inspect each glow plug for a cracked element or open circuit before assuming the preheat system is fine just because it lights up. Torque replacements to 14.7 to 19.6 N·m as specified on page 410; overtightening cracks the ceramic tip and causes intermittent failures that pass a quick continuity check. Also verify battery voltage stays above 10.5V while cranking, since weak preheat current extends cold-start times even with good plugs.
Manual Section: Vi . Engine p. 410Trochoid oil pump failing prematurely requiring full replacement
Pull the pump cover and measure outer rotor clearance with a feeler gauge; replace the assembly once it exceeds the 0.30 mm limit specified on page 409. When reinstalling, torque the trochoid pump mounting bolts to 5.9 to 7.9 N·m per page 380, since overtightening warps the housing and accelerates rotor wear. Low oil pressure warnings that return shortly after a filter change usually trace back to this clearance, not the filter itself.
Manual Section: Vi . Engine p. 380Fuel injector leaks causing black smoke and poor performance
Check each nozzle holder for weeping fuel at the seat and around the nut threads while the engine idles. Remove the leaking injector and torque the nozzle nut to 49.0 to 53.0 N·m on reassembly, per the spec on page 410; an undertorqued nut is the most common cause of return-line leaks that show up as black smoke under load. Bench test the nozzle opening pressure before reinstalling, since a nozzle that opens below spec will keep leaking even with the nut torqued correctly.
Manual Section: Vi . Engine p. 410Frequently Asked Questions
How to reset the Yanmar 2TNV70 fuel solenoid after running dry?
The manual describes bleeding the fuel system after it runs dry, which is the necessary procedure. This involves checking the fuel oil level, opening fuel cocks, loosening the air bleeding bolt on the water separator, and feeding fuel using the priming pump or electromagnetic fuel feed pump for 10 to 15 seconds. p. 314
What are the torque specifications for M8 bolts on the Yanmar 3TNV70 engine mount?
The torque specifications for M8 bolts on the Yanmar 3TNV70 engine mount are provided in the engine mount diagram. Specifically, there are different torque values depending on the bolt's location: A: 54.9 N·m, B: 44.1 N·m, and C: 26.5 N·m. p. 47
Does the Yanmar 3TNV76 have error codes and how to reset them?
The manual does not mention specific error codes for the Yanmar 3TNV76 engine or procedures to reset them. The troubleshooting sections focus on identifying symptoms, probable causes, and remedies for various mechanical and operational issues. p. 131
How to bleed the fuel system on a Yanmar 2TNV70 after the filter housing was empty?
To bleed the fuel system on a Yanmar 2TNV70 after the filter housing was empty, first check the fuel oil level and refuel if necessary. Then, open the fuel cocks of the water separator and fuel filter, loosen the air bleeding bolt on the water separator, and feed fuel using the fuel priming pump or electromagnetic fuel feed pump for 10 to 15 seconds until no bubbles are seen. p. 314
What do I get after purchasing this Yanmar 2TNV70 & variants manual?
Immediate download of the complete 412-page searchable Workshop Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Am I able to print pages from this Yanmar 2TNV70 & variants 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.
Can I find wiring schematics in this Yanmar 2TNV70 & variants manual?
Yes, full electrical schematics are included with wire colors, connector locations, and circuit descriptions.
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