Need the factory operation guide for your Yanmar crawler carrier? This 264-page C12R-A, C30R-2A, C50R-3B Operation Manual (OEM #LGBBFC-00000) lays out everything from initial inspection and daily operation procedures to full system maintenance across all three variants. Inside: hydraulic schematics showing complete circuit routing for the control valve and dump cylinder systems, wiring diagrams for each variant, and a thorough troubleshooting section. You also get a full maintenance chapter with temperature-based fueling, oiling, and greasing schedules, plus the standard tightening torque table for every bolt and nut in the machine. Set your C12R-A control valve relief pressure between 2233 and 2318 PSI (15.4 to 16.0 MPa); the C30R-2A dump cylinder holds at 4640 PSI (32.0 MPa). Your crawler is grounded and the job isn't. Download the PDF, jump to any section with built-in bookmarks, and get the right spec on the first try.
What's Inside This Yanmar C12R-A, C30R-2A, C50R-3B Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 9 | Machine Operation, Inspection Procedures, Servicing Procedures, Safety Precautions, Product Warranty, Machine Specifications |
| Safety Information | 10 | Signal Words, Product Warnings, User Directions, Operation Safety, Machine Maintenance, Unauthorized Modifications |
| Product Overview and Regulation | 11 | Intended Uses, Operation License |
| Ordering Replacement Parts and Service Call | 12 | Location of Machine Serial Number Plate, Location of Engine Serial Number Plate, Location of the Epa Identification Plate, Ordering Replacement Parts and Service Calls |
| Safety | 13-46 | Basic Precautions, Operating Precautions, Precautions for Servicing, Safety Messages (Warning Labels) |
| Description of operator’s Area for C12R-A | 49-66 | Identification of Important Parts |
| Description of operator’s Area for C30R-2A | 67-77 | Monitor, Switches, Control Levers and Pedals, Engine Hood, Fuse Box and Fusible Link, Operator's Seat, Dump Deck Support Stopper |
| Description of operator’s Area for C50R-3B | 78-96 | Monitor, Switches, Engine Hood, Side Cover, Battery Cover, Cabin, Wagon Stopper, Fuel Cap |
| Operating Instructions for C12R-A | 97-123 | Engine, Cooling Water, Engine Oil, Fuel, Hydraulic Oil, Fan Belt, Drive Belt, Rubber Crawler |
| Operating Instructions for C30R-2A | 124-145 | Engine, Machine, Cooling Water, Engine Oil, Fuel Tank, Hydraulic Oil System, Fan Belt, Crawler |
| Operating Instructions for C50R-3B | 146-169 | Engine, Machine, Hydraulic System, Undercarriage, Electrical Equipment, Wagon, Fuel Tank, Fan Belt |
| Care in Cold Weather and Long-Term Storage | 170-175 | Transportation |
| Troubleshooting | 176-180 | Electrical Equipment, Engine, Machine Body, Hydraulic System, Wagon, Undercarriage, Crawler Type, Equipment and Adjustments |
| Maintenance | 181-234 | Precautions for Servicing, Basic Servicing Practices, Fueling, Oiling and Greasing Based on Temperature Range, Standard Tightening Torque for Bolts and Nuts, Maintenance Table |
| Specifications | 235-250 | Options, Hydraulic and Wiring Diagrams |
| Notes | 251-264 | - |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| C12R-A | ||
| Control valve relief pressure | 2233 to 2318 PSI (15.4 to 16.0 MPa) | p. 244 |
| Engine Oil Capacity (with filter) | 1.8 L + 0.4 L | p. 185 |
| Fuel Tank Capacity | 14.5 L | p. 185 |
| Hydraulic Oil System Capacity (in tank) | 14.0 L | p. 185 |
| Cooling System Water Capacity (radiator) | 1.6 L | p. 185 |
| Rubber Crawler Tension Slack | 20-30 mm | p. 102 |
| Fan Belt Tension Slack | 10-15 mm | p. 101 |
| Drive Belt Tension Slack | 10 mm | p. 102 |
| C30R-2A | ||
| Dump cylinder set pressure | 4640 PSI (32.0 MPa) | p. 245 |
| All Models | ||
| Maximum Gradient | 30° | p. 237 |
| Coarse Thread M10x1.5 Torque | 44.1 - 58.8 N•m | p. 186 |
| Fine Thread M10x1.25 Torque | 47.5 - 52.5 N•m | p. 186 |
Yanmar C12R-A, C30R-2A, C50R-3B Common Problems This Manual Covers
Yanmar C12R-A dual hydraulic pump grinding noise and complete loss of track movement
Inspect the hydraulic system for leaks and check for the H01 error code. Test the control valve relief pressure using the schematic on page 244 to confirm it reads 2233 to 2318 PSI (15.4 to 16.0 MPa). Replace the dual-pump components if pressure drops below specification.
Manual Section: Machine Body TroubleshootingSwivel dump angle drifts under load and hydraulic lock valve fails to hold position
Check the dump cylinder set pressure using a calibrated gauge. Adjust the hydraulic lock valve to reach exactly 4640 PSI (32.0 MPa) as specified for the C30R-2A model on page 245. Replace the swivel dump pivot pin if the wagon continues dumping or swinging unexpectedly.
Manual Section: Machine Body TroubleshootingRubber crawler track slips off the sprocket during tight turns or uneven terrain operation
Measure the track sag at the center track roller. Adjust the grease cylinder until the rubber crawler tension slack measures 20-30 mm as detailed on page 128 for the C30R-2A. Clean off excess grease and torque the M10x1.5 access bolts to 44.1 - 58.8 N•m.
Manual Section: Machine Body TroubleshootingStarter motor clicks but engine fails to turn over after winter storage period
Test the battery voltage and inspect terminals for corrosion. Follow the battery overdischarge recovery steps. Drain the old crankcase oil and refill with exactly 1.8 L plus 0.4 L for the filter to meet the C12R-A capacity on page 185.
Manual Section: Electrical Equipment TroubleshootingFrequently Asked Questions
How do you fix Yanmar C12R-A dual hydraulic pump grinding noise and complete loss of track movement?
Inspect the hydraulic system for leaks and check for the H01 error code. Test the control valve relief pressure using the schematic on page 244 to confirm it reads 2233 to 2318 PSI (15.4 to 16.0 MPa). Replace the dual-pump components if pressure drops below specification.
How do you fix swivel dump angle drifts under load and hydraulic lock valve fails to hold position?
Check the dump cylinder set pressure using a calibrated gauge. Adjust the hydraulic lock valve to reach exactly 4640 PSI (32.0 MPa) as specified for the C30R-2A model on page 245. Replace the swivel dump pivot pin if the wagon continues dumping or swinging unexpectedly.
How do you fix rubber crawler track slips off the sprocket during tight turns or uneven terrain operation?
Measure the track sag at the center track roller. Adjust the grease cylinder until the rubber crawler tension slack measures 20-30 mm as detailed on page 128 for the C30R-2A. Clean off excess grease and torque the M10x1.5 access bolts to 44.1 - 58.8 N•m.
How do you fix starter motor clicks but engine fails to turn over after winter storage period?
Test the battery voltage and inspect terminals for corrosion. Follow the battery overdischarge recovery steps. Drain the old crankcase oil and refill with exactly 1.8 L plus 0.4 L for the filter to meet the C12R-A capacity on page 185.
What do I get after purchasing this Yanmar C12R-A, C30R-2A, C50R-3B?
Immediate download of the complete 264-page searchable Operation Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Can I print specific sections of this Yanmar C12R-A, C30R-2A, C50R-3B?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Does this Yanmar C12R-A, C30R-2A, C50R-3B manual cover the hydraulic?
A hydraulic system diagram for the Yanmar C12R-A, C30R-2A, C50R-3B is included.
Reviews
There are no reviews yet.