Part of the Yanmar Repair Manuals.
When a C12R will not travel in either direction and the crew is standing around a stalled job, the real question is whether the fault sits in the H.S.T. drive or somewhere in the hydraulics, and guessing wrong costs the rest of the day. This Yanmar service manual (publication 0BKC2-EN0010) exists to answer that question for the C12R and C12R (3WD), serial numbers 20501 and up, powered by the 2TNE68-EFW diesel.
Across 202 pages it covers engine measurement and adjustment, hydraulic cylinders, oil tank and piping, the machine's electrical equipment with wiring diagrams, undercarriage service standards and tightening torques, periodic servicing, and a troubleshooting chapter for both the engine and the H.S.T.
It arrives as a PDF download the moment you pay, prints cleanly for the bench, and is yours to keep for the life of the machine.
What's Inside This Yanmar C12R, C12R (3WD) Manual
| System | Pages | Key Topics |
|---|---|---|
| General Cautions for Maintenance Work | 6-17 | Hydraulic Equipment, Hydraulic Piping, Seals, Hydraulic Hose, H.S.T. System, Hydraulic Cylinders |
| Technical Data | 18-27 | Specifications, Machine Dimensions, Hydraulic Circuit Schematic, Wiring Diagram, Weight of Components |
| Service Standards | 28-41 | Machine Performance, Engine, Undercarriage, Control Devices, Hydraulic Cylinder, Work Implement, List of Tightening Torque (Machine) |
| Engine | 42-86 | Measurement |
| Structure and Operation | 87-98 | Electrical Equipment of Machine (Parts Layout of Electrical Equipment, Monitor and Alarm Systems, Wiring Diagram, Circuit Description of Engine Start and Stop, Circuit Description of Battery Charging) |
| Hydraulic Equipment | 99-132 | Hydraulic Cylinder, Hydraulic Oil Tank, Hydraulic Piping |
| Structure and Operation | 133-184 | Electrical Equipment, Undercarriage, Control Equipment, Power Transmission, Hydraulic Equipment, Wagon, Monitor and Alarm Systems, Rubber Crawler |
| Periodic Inspection and Servicing | 185-187 | Lube Oil, Hydraulic System, Undercarriage, Steering Equipment, Electric Equipment, Fuel, Cooling Water, Rubber Hose |
| Fuel, Lube Oil and Grease Recommended | 188-189 | Engine Oil, Transmission Oil, Hydraulic Oil, Fuel, Engine Cooling Water |
| Troubleshooting | 190-201 | Machine and Engine, H.S.T. |
| Colophon | 202 | - |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Track roller ass'y tightening torque | 115.7 to 123.0 ft-lbf (156.8 to 166.6 N•m) | p. 35 |
| Oil seal 24 cover screws tightening torque | 4.7 ft-lbf (6.4 N•m) | p. 124 |
| Fuel injection pressure | 1711 to 1842 PSI (11.8 to 12.7 MPa) | p. 22 |
| Radiator hose clip tightening torque | 1.81 to 2.17 ft-lbf (2.45 to 2.94 N•m) | p. 35 |
| Engine oil pressure switch working pressure | 5.69 to 8.53 PSI (0.04 to 0.06 MPa) | p. 135 |
| Engine Oil Pan Capacity | 1.90 Qts. (1.8 L) | p. 189 |
| Hydraulic Oil System Capacity | 4.36 Gals. (16.5 L) | p. 189 |
| Fuel Tank Capacity | 3.83 Gals. (14.5 L) | p. 189 |
| Dump Cylinder Nut Tightening Torque | 217 to 253 ft-lbf (294 to 343 N•m) | p. 38 |
| Engine Minimum Idling Speed | 1075 to 1125 rpm | p. 21 |
| Glow Plug Tightening Torque | 11.07 to 14.76 ft-lbf (15 to 20 N•m) | p. 86 |
Yanmar C12R, C12R (3WD) Common Problems This Manual Covers
No travel forward or reverse
Loss of drive in one or both directions is the fault that parks a C12R hardest, and it can come from the machine side or the H.S.T. The troubleshooting chapter gives fault tables for both, so you can isolate the cause before tearing anything down.
Manual Section: Chapter 10 Troubleshooting p. 190Hydraulic leaks and falling pressure
Aging seals and vibration-worn piping let oil out and pressure down until the machine can no longer do its work. The hydraulic equipment chapter covers the cylinders, oil tank, and piping, including disassembly and reassembly of the leaking components.
Manual Section: Chapter 6 Hydraulic Equipment p. 99Engine down on power under load
A 2TNE68-EFW that starts but will not pull rated speed usually needs compression, valve clearance, injection timing, and the fuel injection valve checked in order. The engine chapter lays out each measurement, its service data, and the corrective action.
Manual Section: Chapter 4 Engine p. 42No-start or battery not charging
Starter and charging faults on a machine this age are as often wiring and sensors as the components themselves. This chapter maps the electrical parts layout, the monitor and alarm systems, and the start, stop, and battery charging circuits with a wiring diagram.
Manual Section: Chapter 5 Structure and Operation p. 87Undercarriage wear and loose hardware
Track components wear quietly until a roller lets go on the job. The service standards chapter gives wear limits for the undercarriage plus the machine's full tightening torque list, so you can decide what to replace and bolt it back on to spec.
Manual Section: Chapter 3 Service Standards p. 28Wrong fluids shortening component life
Premature hydraulic and engine wear often starts at the fill cap. This short chapter states the recommended fuel, lube oil, and grease for the machine so every service uses what Yanmar specified.
Manual Section: Chapter 9 Fuel, Lube Oil and Grease Recommended p. 188Frequently Asked Questions
Which machines does this manual cover?
It covers the Yanmar C12R and C12R (3WD) with the 2TNE68-EFW engine, serial numbers 20501 and up. It is the factory service manual, publication number 0BKC2-EN0010, in English.
Does it include wiring diagrams and a hydraulic schematic?
Yes. The Technical Data chapter includes the wiring diagram and hydraulic circuit schematic alongside specifications, machine dimensions, and component weights, and the electrical chapters add parts layout and circuit descriptions for starting and charging. p. 18
Are tightening torque specs included?
Yes. The Service Standards chapter includes a tightening torque list for the machine, along with service standards for the engine, undercarriage, control devices, hydraulic cylinders, and work implement. p. 28
Will it help diagnose H.S.T. drive problems?
Yes. The Troubleshooting chapter covers both machine and engine faults and has dedicated H.S.T. coverage, and the general cautions chapter includes the air release procedure for the H.S.T. system after hydraulic work. p. 190
Is this Service Manual a digital download?
Instant PDF download. You get the full 202-page searchable Service Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Can I print specific sections of this Service 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.
Are electrical wiring diagrams included in this manual?
Yes. You'll find full electrical schematics with wire routing diagrams, connector identification, and circuit descriptions.
Reviews
There are no reviews yet.