Need the real factory data to rebuild your crawler carrier? All 221 pages of this Yanmar C12R(EP) service manual PDF focus on getting your machine running perfectly. Inside, you get electrical wiring diagrams, complete hydraulic circuit schematics, and a massive troubleshooting section covering engine start failures down to track tension issues. Open up to step-by-step teardown procedures for the H.S.T. transmission, control valves, and undercarriage assemblies, backed by clear exploded views. Top off the hydraulic tank with exactly 16.5 liters of Yanmar SUPER HYDRO OIL, and secure the main engine mounts to 44.1-58.8 ft-lbf of torque. Stop wasting shop time on forum guesses and trial-and-error fixes. Download this bookmarked file instantly, pull it up on your phone or laptop, and find the exact spec you need to finish the job.
What's Inside This Yanmar C12R(EP) Manual
| System | Pages | Key Topics |
|---|---|---|
| General Cautions for Maintenance Work | 9-22 | Correct Work, Safety Precautions, Preparations, Cautions for Disassembly and Reassembly, Cautions for Removal and Installation of Hydraulic Equipment |
| Technical Data | 23-34 | Specifications, Machine Dimensions, Hydraulic Circuit Schematic, Wiring Diagram, Weight of Components |
| Service Standards | 35-50 | Machine Performance, Engine, Undercarriage, Control Devices, Hydraulic Cylinder, Work Implement, List of Tightening Torque (Machine) |
| Engine | 51-96 | Measurement |
| Structure and Operation | 97-110 | 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 | 111-146 | Hydraulic Cylinder, Hydraulic Oil Tank, Hydraulic Piping |
| Structure and Operation | 147-198 | Electrical Equipment, Undercarriage, Control Equipment, Power Transmission, Hydraulic Equipment, Wagon |
| Periodic Inspection and Servicing | 199-202 | Lube Oil, Hydraulic System, Undercarriage, Steering Equipment, Electric Equipment, Fuel, Cooling Water, Rubber Hose |
| Fuel, Lube Oil and Grease Recommended | 203-206 | Engine Oil, Transmission Oil, Hydraulic Oil, Fuel, Engine Cooling Water, Fuel Tank, Cooling System |
| Troubleshooting | 207-219 | Machine and Engine, H.S.T., Fuel System, Cooling Water System, Cylinder Head, Piston, Starter Motor, Battery |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Engine × Engine mount tightening torque | 44.1 to 58.8 ft•lbf (4.5 to 6.0 N•m) | p. 48 |
| Engine mount vibroisolating rubber Nut M12 tightening torque | 32.6 to 43.5 ft•lbf (44.1 to 58.9 N•m) | p. 48 |
| Hydraulic oil type | YANMAR SUPER HYDRO OIL (ISO VG46) | p. 205 |
| Hydraulic oil system prescribed amount | 4.36 Gals. (16.5 L) | p. 205 |
| Fuel filter filtration area | 66.96 sq.in. (432 sq.cm) | p. 27 |
| LO filter filtration area | 124.0 sq.in. (800 sq.cm) | p. 27 |
| Air cleaner type | Cyclone type | p. 28 |
| Air cleaner filtration area | 4.7 sq.ft. (0.44 sq.m) | p. 28 |
| Hydraulic hose installation tightening torque (valve piping) | 16.6 to 20.3 ft•lbf (22.5 to 27.4 N•m) | p. 142 |
| Hydraulic hose tightening procedure (initial) | Tighten to specified torque, then loosen a little, then retighten to specified torque. | p. 12 |
| HST (High) relief set pressure | 3959 to 4002 PSI (27.4 to 27.7 MPa) | p. 25 |
| HST (Low) relief set pressure | 58 to 87 PSI (0.4 to 0.6 MPa) | p. 25 |
Yanmar C12R(EP) Common Problems This Manual Covers
Yanmar C12R crawler carrier pulls to one side when starting travel or tracks unevenly p. 144
Bleed the hydraulic travel circuit by running the engine and operating the travel levers repeatedly. Check the charge relief pressure on page 144 to ensure it meets 15.69 MPa (157 to 163 kgf/cm2). Verify the parking brake solenoid harness is fully connected.
Manual Section: Chapter 6 Hydraulic EquipmentTravel response feels weak, jerky, or inconsistent immediately after hydraulic maintenance or oil changes p. 168
Inspect the travel pedal linkage and verify the travel pedal play is within 0.2 to 1.0 in. (5 to 25 mm) as shown on page 168. If the pedal is adjusted correctly, bleed the hydraulic system and check for trapped air in the lines.
Manual Section: Chapter 7 Structure and OperationHydraulic oil drips from tank fittings or fluid level reads consistently low after bleeding p. 49
Torque the hydraulic oil tank drain plug to exactly 43.6 ft•lbf (59 N•m) as detailed on page 49. Top off the fluid with YANMAR SUPER HYDRO OIL (ISO VG46). Check the oil level before start-up when the temperature is between 50 to 86 °F (10 to 30 °C).
Manual Section: Chapter 3 Service StandardsFreshly installed hydraulic valve piping leaks fluid under pressure during normal operation p. 12
Tighten the hydraulic valve piping hoses to 16.6 to 20.3 ft•lbf (22.5 to 27.4 N•m). Follow the initial tightening procedure on page 12 by torquing to spec, loosening a little, and then retightening to the final specified torque to seat the fitting properly.
Manual Section: Chapter 1 General Cautions for Maintenance WorkFrequently Asked Questions
How do I reset the YANMAR C12R(EP) travel hydraulic system?
To release air from the H.S.T. system, first fill the H.S.T. with hydraulic oil (0.6 L if the pump is empty) and install the return hose. After idling the engine for 5 minutes, stop it to check for leaks and oil level. Restart the engine and travel forward and backward at medium speed 3 or 4 times, then stop after running at rated speed to recheck the oil level. The extension and retraction stroke is up to 1.97 to 3.9 in. (50 to 100 mm) from each stroke end.
What does the YANMAR C12R(EP) warning light mean?
The warning lights indicate specific conditions: the Engine oil alarm lamp, Water temp. alarm lamp, and Battery charge alarm lamp. All lamps should illuminate for a few seconds when the starter switch is turned on and extinguish when the engine is running. If a lamp remains on while the engine is running, the buzzer will sound, indicating a potential issue such as low engine oil pressure or overheating.
What are the torque specs for YANMAR C12R(EP) track rollers?
The tightening torque for the track roller assembly on the YANMAR C12R(EP) is specified as 115.7 to 123.0 ft•lbf (156.8 to 166.6 N•m). This applies to the Nut M16 (fine) used for the track roller assembly.
What is the recommended compression pressure for the YANMAR C12R(EP) engine?
The standard compression pressure for the YANMAR C12R(EP) engine is 470 PSI (3.24 MPa) at 250 rpm. The allowable limit for compression pressure is 362.5 PSI (2.5 MPa), with variations among cylinders not exceeding 28.4 to 42.7 PSI (0.2 to 0.3 MPa).
What format is this manual in?
A 221-page Service Manual in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Can I print specific sections of this Service Manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Can I find wiring schematics in this Yanmar C12R(EP) manual?
Yes, this Yanmar C12R(EP) Service Manual includes complete electrical wiring diagrams, wire routing, and connector pinouts.
Document Quality
This is a scanned PDF document with an OCR layer, allowing you to search and copy the full text with good accuracy. The main body text is crisp and easy to read, though some larger headings show slight pixelation upon closer inspection. Diagrams and illustrations are raster images that pixelate when zoomed, but their labels remain generally readable. Pages are clean with no significant stains or skewed content, but you will find several blank pages interspersed throughout the document.
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