Part of the Yanmar Repair Manuals.
Set valve clearance on the 4TNE106-TB by feel and you are guessing; this Yanmar service manual gives you the written procedure instead, along with injection timing inspection, injector pressure and spray pattern testing, and no-load maximum speed adjustment for the C50R-3(R) crawler carrier. It is the factory workshop document, 374 pages in English, delivered as a PDF download.
Past the engine, it works through the whole machine: the hydraulic system unit by unit, structure and operating principles including the start and stop circuit on the 24 volt electrical system, servicing standards with wear limits and tightening torque tables, and a troubleshooting chapter for chasing symptoms back to causes.
A guessed torque or relief pressure can cost you a casting or a pump. The figures here, like the hydraulic pump's 5075 PSI maximum working pressure, come straight from Yanmar, so what you put back together runs.
What's Inside This Yanmar C50R-3(R) Manual
| System | Pages | Key Topics |
|---|---|---|
| General Cautions for Maintenance Work | 9-26 | Correct Work, Safety Precautions, Preparations, Cautions for Disassembly and Reassembly, Cautions for Removal and Installation of Hydraulic Equipment |
| Technical Data | 27-42 | Specifications, Outside Drawing, Hydraulic Circuit Diagram, Electrical Circuit Diagram, Main Parts Mass Chart |
| Servicing Standards | 43-60 | Machine Performance (Reference Value Table, Expendables, Methods for Inspecting Performance), Engine Servicing Standards, Servicing Standards for Parts of Undercarriage |
| Engine Servicing Procedure | 61-126 | Adjustment (Oil Inspection, Cooling Water Inspection, Inspecting Water Leak From Cooling Water System and Rediator, Fan Belt Tension Inspection and Adjustment, Valve Clearance, Inspecting the Fuel Injection Valve Injection Pressure and Spray Pattern, Fuel Injection Timing Inspection and Adjustment, No-Load Maximum Revolutions, Sensor Inspection) |
| Structure and Operating Principles | 127-140 | Components and Names, Power Transmission Mechanism, Electrical Equipment of the Machine (Parts Layout of Electrical Equipment), Descriptions of Engine Start/Stop Circuit |
| Hydraulic System | 141-280 | Outline, Hydraulic Units |
| Service Procedures for Individual Components | 281-342 | Engine Related Components, Electrical Equipments, Undercarriage, Control System, Hydraulic System, Riggings, Swing Wagon |
| Periodic Inspection and Servicing | 343-346 | Lube Oil, Hydraulic System, Grease, Undercarriage, Steering Equipment, Electric Equipment, Fuel Oil, Cooling Water |
| Fuel, Lube Oil and Grease Recommended | 347-350 | Fuel, Lube Oil, Grease, Engine Oil, Hydraulic Oil, Travel Reduction Gear Oil, Idler, Carrier Roller |
| Troubleshooting | 351-366 | HST Pump, Fuel Injection Pump, Governor, HST Troubleshooting, Travel Motor, Sprocket, Parking Brake, Control Valve |
| Option | 367-372 | Cooler, Cooler Assembly, Compressor Assembly, Condenser Assembly, Cooler Unit Assembly |
| Colophon | 373 | - |
| Spine Title | 374 | - |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| General tightening torque for M10 x 1.5 bolts | 34.7 ±1.7 ft·lbf (47.1 ±2.4 N·m) | p. 57 |
| Hydraulic oil tank line filter replacement interval | Every 500 hrs. (After first 250 hrs.) | p. 45 |
| Hydraulic oil tank return filter replacement interval | Every 1000 hrs. (After first 50 hrs.) | p. 45 |
| Hydraulic oil recommended type | Anti-wear hydraulic oil ISO VG46 | p. 349 |
| Hydraulic oil capacity | 15.05 Gals. (57 L) | p. 349 |
| Battery type | FZ/75D23R | p. 32 |
| Battery voltage 5 hrs rate capacity | 24–64 V–A·h | p. 32 |
| Starter nominal voltage | 24 V | p. 33 |
| Braided hose (SL-06) inner diameter | 0.248 (6.3) in. (mm) | p. 22 |
| Braided hose (SL-06) thickness | 0.102 (2.6) in. (mm) | p. 22 |
| General caution for O-rings | Be careful not to twist O-rings. If an O-ring is twisted, remove the twist with the fingertips. | p. 19 |
| Seal replacement condition | If a seal is abnormal, replace it. | p. 181 |
Yanmar C50R-3(R) Common Problems This Manual Covers
Weak or slow hydraulics under load
Contaminated oil, clogged filters, or air in the circuit will drag down every function on the carrier. The Hydraulic System chapter covers the circuit outline and each hydraulic unit in turn, so you can isolate whether the fault is supply, valve, or actuator.
Manual Section: Chapter 6 Hydraulic System p. 141Hard starting on the 24 volt system
Intermittent no-start conditions on this machine usually trace to the battery, connections, or the start circuit itself. The manual lays out the electrical equipment parts layout and describes the engine start and stop circuit so you can test it stage by stage.
Manual Section: Chapter 5 Structure and Operating Principles p. 127Rough running or low engine power
Tight valves, a lazy injector, or drifted injection timing all show up as the same vague complaint. This chapter gives the procedures for valve clearance adjustment, injection pressure and spray pattern inspection, and fuel injection timing on the 4TNE106-TB.
Manual Section: Chapter 4 Engine Servicing Procedure p. 61Dump body drifts or responds erratically
A load that creeps down or a spool that acts inconsistently points to internal valve leakage or worn cylinder seals. The component service procedures walk through disassembly, inspection, and reassembly of the individual units involved.
Manual Section: Chapter 7 Service Procedures for Individual Components p. 281Track rollers worn past their limits
Rollers and related track parts wear gradually until alignment and ride suffer. The servicing standards give allowable limits, such as the track roller and shaft limit, so you replace on measurement rather than guesswork.
Manual Section: Chapter 3 Servicing Standards p. 43Leaks that come back after repairs
A twisted O-ring or a badly routed hose will reopen a leak within hours of the fix. The opening chapter covers seal handling, correct hydraulic hose installation, and how to release air from the hydraulic units afterward.
Manual Section: Chapter 1 General Cautions for Maintenance Work p. 9Frequently Asked Questions
Which machine and engine does this manual cover?
It covers the Yanmar C50R-3(R) crawler carrier fitted with the 4TNE106-TB diesel engine. It is the full 374 page service manual in English, covering engine, hydraulic, electrical, and track systems.
Does it include wiring and hydraulic schematics?
Yes. The Technical Data chapter contains both the electrical circuit diagram and the hydraulic circuit diagram, along with specifications, an outside drawing, and a main parts mass chart. p. 27
Are torque specs and wear limits included?
Yes. The Servicing Standards chapter includes tightening torque tables for vehicle and engine fasteners, engine servicing standards, and wear limits for track parts, control equipment, and hydraulic cylinders. p. 43
Can I set valve clearance and injection timing with it?
Yes. The Engine Servicing Procedure chapter covers valve clearance adjustment, fuel injection timing inspection and adjustment, injector pressure and spray pattern testing, fan belt tension, and no-load maximum speed adjustment for the 4TNE106-TB. p. 61
How quickly can I access this manual after buying?
You get a 374-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Can I print this manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Are electrical wiring diagrams included in this Yanmar C50R-3/R Service Manual?
Yes. The Technical Data chapter carries the electrical circuit diagram alongside the hydraulic circuit diagram, and the Structure and Operating Principles chapter adds the parts layout of the electrical equipment and a description of the engine start and stop circuit.
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