All 697 pages of this Yanmar C30R-3 Crawler Carrier Service Manual (OEM #0BKC2-EN0060) come straight from the factory, covering the diesel engine, full HST hydraulic system, travel motor, swing motor, control valve, and wagon assemblies. Inside: wiring diagrams, a complete hydraulic circuit schematic tracing fluid routing through every pump and pilot valve, and a full error code diagnostic section for engine ECU and machine faults. You also get a service standards chapter loaded with torque tables for hydraulic fittings and engine fasteners, plus step-by-step adjustment and repair procedures across the engine, undercarriage, controls, hydraulic equipment, and wagon. Set the parking brake release pressure to 406 PSI (2.8 MPa) and fill the hydraulic system to 38L (three-side flaps wagon) or 40L (swing wagon type) before startup. Your carrier is down. Bookmarked for instant navigation, search any spec by keyword and get back to work.
What's Inside This Yanmar C30R-3 Manual
| System | Pages | Key Topics |
|---|---|---|
| Spine | 2 | - |
| General Cautions for Maintenance Work | 13-26 | Correct Work, Safety Precautions, Preparations, Cautions for Disassembly and Reassembly, Cautions for Removal and Installation of Hydraulic Equipment |
| Technical Data | 27-54 | 2-1 Specifications, 2-2 Outline Drawing and Working Area, 2-3 Weight List of Main Parts, 2-4 Power Transmission, 2-5 List of Periodic Inspection and Servicing, 2-6 Fuel |
| Service Standards | 55-84 | Machine Performance (Three-Side Flaps Wagon Type, Swing Wagon Type), Engine (Nominal and Allowable Values), Undercarriage, Controls, Hydraulic Cylinder, Work Implement |
| Engine | 85-259 | 4-1 Safety, 4-2 Engine, 4-3 Fuel System, 4-4 Cooling System, 4-5 Lubrication System, 4-6 Starter Motor, 4-7 Alternator, 4-8 Electronic Control System |
| Electric System | 260-315 | 5-1 Electric Equipment of Machine, 5-2 Circuit Description of Engine Start and Stop, 5-3 vCircuit Description of Engine Start and Stop, 5-4 Engine ECU (Engine Controller) |
| Hydraulic System | 316-522 | 6-1 Outline, 6-2 Component Parts, 6-3 Circuit Operation, 6-4 Hydraulic Pump (HST), 6-5 Travel Motor, 6-6 Swing Motor, 6-7 Control Valve, 6-8 Pilot Valve |
| Adjustment and Repair | 523-672 | 7-1 Engine and Electric Equipment, 7-2 Undercarriage, 7-3 Controls, 7-4 Hydraulic Equipment, 7-5 Wagon |
| Troubleshooting | 673-697 | 8-1 Troubleshooting |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Hydraulic oil capacity (Three-side flaps wagon type) | 10 Gals (38 L) | p. 39 |
| Hydraulic oil capacity (Swing wagon type) | 10.6 Gals (40 L) | p. 39 |
| Air cleaner filtration area | 12.8 sq.ft. (1.19 sq.m) | p. 30 |
| Air cleaner element replacement interval | Every 500 hrs | p. 37 |
| Parking brake release pressure | 406 PSI (2.8 MPa) | p. 27 |
| Hydraulic pump maximum working pressure | 4978 PSI (34.3 MPa) | p. 27 |
| Travel motor displacement (Low/High) | 2.06 in3/rev (33.8 cm3/rev) / 1.03 in3/rev (16.9 cm3/rev) | p. 28 |
| Track roller shaft A wear limit | Ø2.439 in. (Ø61.69 mm) | p. 66 |
| Sprocket A wear limit | 0.91 in. (23 mm) | p. 66 |
| Machine not moving straight after travel/brake service or hydraulic work | Perform air bleeding (follow steps 1 and 3 to 12 on page 21) and warm-up before travel if at low hydraulic oil temperatures. | p. 22 |
| Hydraulic oil overflow during air release | Hydraulic oil begins to overflow through the air breathers (3, 4, 5, and 6) | p. 21 |
| Rubber track A wear limit | 0.32 in. (8 mm) | p. 66 |
Yanmar C30R-3 Common Problems This Manual Covers
Yanmar C30R-3 won't travel straight after hydraulic or brake service, pulls hard to one side p. 22
Perform the air-bleeding cycle on page 21 repeatedly: run forward, then reverse travel until the machine tracks straight. Verify hydraulic oil is at the correct level for the 38 L (10 gal) total system capacity shown on page 39 after each cycle. Warm the machine to operating temperature before the final straight-travel test per page 22.
Manual Section: General Cautions for Maintenance WorkTravel is weak, jerky, or carrier does not respond normally in forward or reverse p. 673
Verify charge relief pressure is at 2.8 MPa (406 PSI) as spec'd on page 27. Disconnect and reconnect the parking-brake solenoid harness, then test forward and reverse travel separately. If pressure holds but travel stays sluggish, inspect travel motor displacement against the 33.8 cm3/rev low-speed value on page 28 and work through the HST troubleshooting chart on page 673.
Manual Section: HST System Relationship TroubleshootingHydraulic oil overflows through breathers during air bleeding after service, tank level drops p. 21
Follow the numbered air-release sequence; oil overflowing through breathers 3, 4, 5, and 6 on page 21 is the signal that each circuit is purged, not a sign of overfill. Stop at overflow, re-tighten each breather, then top up to the 38 L (10 gal) system capacity on page 39 and recheck level before startup.
Manual Section: General Cautions for Maintenance WorkParking brake solenoid harness disconnected during repairs, carrier won't release or move on one side
Reconnect the parking-brake solenoid harness fully before any travel test. Measure brake release pressure; it should reach 2.8 MPa (406 PSI) per the spec on page 27. If both tracks engage but one side drags or won't turn, run the complete travel-motor checks beginning on page 673 before condemning the solenoid or motor.
Manual Section: Travel Motor TroubleshootingRubber tracks worn below spec or undercarriage vibrating excessively during loaded carrier operation p. 66
Inspect rubber track lug height and replace if worn below the 0.32 in. (8 mm) wear limit on page 66. Measure track roller shaft diameter against the Ø61.69 mm minimum at the same time. On reassembly, torque sprocket bolts to 138 to 151 ft·lbf (186 to 206 N·m) per page 73.
Manual Section: Service StandardsFrequently Asked Questions
How do I release air from the hydraulic system on the Yanmar C30R-3?
To release air from the hydraulic system, disconnect harness 1 from the parking brake solenoid valve. Remove the connector from drain port 2 of the hydraulic pump, fill the front case housing with hydraulic oil, and reinstall the connector. Loosen air breathers 3, 4, 5, and 6 on the front and rear case. Start the engine, run at idle speed, and move the travel lever repeatedly. Once hydraulic oil begins to overflow through the air breathers, tighten breathers 3, 4, 5 and 6. Restart the engine, run at 1800 to 2200 rpm and move the machine forward and backward 5 or 6 times. Full procedure is on page 20-21 of the manual.
Why won't my Yanmar C30R-3 travel straight after hydraulic or brake service?
If the carrier pulls to one side after hydraulic or brake service, perform the full air-bleeding cycle on page 21 repeatedly: run forward then reverse until the machine tracks straight. Verify hydraulic oil is at the correct level for the 38L (10 gal) total system capacity shown on page 39 after each cycle. Warm the machine to operating temperature before the final straight-travel test per page 22.
What should I check if travel is weak, jerky, or the C30R-3 does not respond normally?
Verify charge relief pressure is at 2.8 MPa (406 PSI) as specified on page 27. Disconnect and reconnect the parking-brake solenoid harness, then test forward and reverse travel separately. If pressure holds but travel stays sluggish, inspect travel motor displacement against the 33.8 cm3/rev low-speed value on page 28 and work through the HST troubleshooting chart on page 673.
When should I replace the rubber tracks on the Yanmar C30R-3?
Replace rubber tracks when lug height wears below the 0.32 in. (8 mm) wear limit on page 66. Also measure track roller shaft diameter against the 61.69 mm minimum at the same time. On reassembly, torque sprocket bolts to 138 to 151 ft·lbf (186 to 206 N·m) per page 73.
What file format is this manual delivered in?
The manual is delivered as a searchable PDF file. You receive a download link immediately after purchase, accessible on any device including phone, tablet, laptop, or desktop. No special software required — opens in any standard PDF reader.
Are there any print restrictions on the Yanmar C30R-3 service manual?
No print restrictions. Once downloaded, you can print as many copies as you need for personal or shop use. Print the full 697 pages or just the sections you need for a specific repair job.
Is this manual compatible with all devices?
Yes. The PDF is compatible with all devices and operating systems — Windows, Mac, iOS, and Android. Open it on your phone in the shop, your tablet on the machine, or your laptop at your desk. No app purchase required.
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