Part of the Yanmar Repair Manuals.
Somewhere around hour 500, the hydraulic tank line filter on a Yanmar C50R-3C comes due, and the job stalls the moment you need the one number nobody remembers: the torque on the fitting, the pressure spec, the interval you actually missed. This 573 page factory service manual (publication 0BKC3-G50302) ends that stall, covering the C50R-3C crawler carrier from the 4JJ1X diesel down to the track rollers.
Inside are servicing standards with wear limits and a full tightening torque table, hydraulic system teardown for the pump, travel motor, swing motor, and control valve, electrical and hydraulic circuit diagrams, troubleshooting charts including HST, and a complete engine workshop manual.
The PDF carries 168 bookmarks, so jumping from a symptom in the troubleshooting chapter to the matching spec in the servicing standards takes seconds, not a flip through five hundred loose photocopies.
Complete the set for your C50R-3C
- Parts Catalog: Yanmar C50R-3B Parts Catalog
- Parts Catalog: Yanmar C50R-5, 4TNV94CHT-NTBC Parts Catalog
- Parts Catalog: Yanmar C50R-3C Parts Catalog (Crawler Carrier)
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General Cautions for Maintenance Work | 7-20 | Correct Work, Safety Precautions, Preparations, Cautions for Disassembly and Reassembly, Cautions for Removal and Installation of Hydraulic Equipment |
| Technical Data | 21-36 | Outside Drawing, Hydraulic Circuit Diagram, E Lectrical Circuit Diagram, Main Parts Mass Chart |
| Servicing Standards | 37-52 | Servicing Standards for Parts of Undercarriage, Control Equipment, Hydraulic Equipment, Working Equipment, Tightening Torque Table |
| Engine Servicing Procedure | 53-54 | |
| Structure and Operating Principles | 55-66 | Components and Names, Power Transmission Mechanism, Electrical Equipment of the Machine, Explanation of Starting and Stopping Engine Circuit |
| Hydraulic System | 67-234 | Outline, Hydraulic Pump, Gear Pump, Travel Motor, Swing Motor, Control Valve, Remote Control Valve, Swivel Selector |
| Service Procedures for Individual Components | 235-301 | Engine Related Components, Electrical Equipments, Undercarriage, Control System, Hydraulic System, Riggings, Swing Wagon |
| Periodic Inspection and Servicing | 302-305 | List of Periodic Inspection and Servicing |
| Fuel, Lube Oil and Grease Recommended | 306-309 | Fuel, Lube Oil and Grease Recommended |
| Troubleshooting | 310-323 | HST Troubleshooting |
| Option | 324-331 | Air Conditioner |
| Engine Workshop Manual (Isuzu 4JJ1X) | 332-573 | General Information, Engine |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| General tightening points (Coarse) M6 × 1.0 | 7.2 ±0.4 ft·lbf (9.8 ±0.5 N·m) | p. 46 |
| General tightening points (Fine) M8 × 1.0 | 18.1 ±0.9 ft·lbf (24.5 ±1.2 N·m) | p. 46 |
| Hydraulic oil tank line filter replacement interval | Every 500 hrs. (After first 250 hrs.) | p. 39 |
| Hydraulic oil tank return filter replacement interval | Every 1000 hrs. (After first 50 hrs.) | p. 39 |
| Tightening torque for metal fitting on hydraulic piping | Specified tightening torque (general guidance, no single value) | p. 16 |
| Tightening torque for HST pump bolts (M10x25-P1.5) | 36.9 ft·lbf (50 N·m) | p. 253 |
| Track roller & shaft (A) allowable limit | ø10.24 (260) in. (mm) | p. 42 |
| Sprocket (A) allowable limit | 1.46 (37) in. (mm) | p. 43 |
| Oil seal (Travel Motor) inspection standard | Replace | p. 155 |
| Air cleaner replacement interval | Every 1000 hrs. (After first 50 hrs.) | p. 39 |
| Pre-fuel filter replacement interval | Every 500 hrs. | p. 39 |
| Main fuel filter replacement interval | Every 500 hrs. | p. 39 |
