Fixing a downed Crawler Carrier requires hard facts, and this 374-page Yanmar C50R-3/R Service Manual PDF delivers the exact factory instructions for the 3-side flaps wagon, Scoop-end wagon, and Swing wagon. Open this guide to find complete hydraulic schematics, detailed wiring diagrams, and step-by-step engine servicing procedures. You get a full troubleshooting section designed to isolate faults fast, plus page after page of tightening torque tables to put everything back together right. Top off the tank with exactly 57 liters of ISO VG46 hydraulic oil, and ensure all M10 x 1.5 structural bolts are secured to 47.1 N-m. Every hour in the shop costs money. Grab this bookmarked download, pull it up on your shop tablet, and get your machine back to work.
What's Inside This Yanmar C50R-3(R) Manual
| System | Pages | Key Topics |
|---|---|---|
| General Cautions for Maintenance Work | 9-26 | Correct Work, Safety Precautions, Preparations, Cautions for Disassembly and Reassembly, Cautions for Removal and Installation of Hydraulic Equipment |
| Technical Data | 27-42 | Specifications, Outside Drawing, Hydraulic Circuit Diagram, Electrical Circuit Diagram, Main Parts Mass Chart |
| Servicing Standards | 43-60 | Machine Performance (Reference Value Table, Expendables, Methods for Inspecting Performance), Engine Servicing Standards, Servicing Standards for Parts of Undercarriage |
| Engine Servicing Procedure | 61-126 | Adjustment (Oil Inspection, Cooling Water Inspection, Inspecting Water Leak From Cooling Water System and Rediator, Fan Belt Tension Inspection and Adjustment, Valve Clearance, Inspecting the Fuel Injection Valve Injection Pressure and Spray Pattern, Fuel Injection Timing Inspection and Adjustment, No-Load Maximum Revolutions, Sensor Inspection) |
| Structure and Operating Principles | 127-140 | Components and Names, Power Transmission Mechanism, Electrical Equipment of the Machine (Parts Layout of Electrical Equipment), Descriptions of Engine Start/Stop Circuit |
| Hydraulic System | 141-280 | Outline, Hydraulic Units |
| Service Procedures for Individual Components | 281-342 | Engine Related Components, Electrical Equipments, Undercarriage, Control System, Hydraulic System, Riggings, Swing Wagon |
| Periodic Inspection and Servicing | 343-346 | Lube Oil, Hydraulic System, Grease, Undercarriage, Steering Equipment, Electric Equipment, Fuel Oil, Cooling Water |
| Fuel, Lube Oil and Grease Recommended | 347-350 | Fuel, Lube Oil, Grease, Engine Oil, Hydraulic Oil, Travel Reduction Gear Oil, Idler, Carrier Roller |
| Troubleshooting | 351-366 | HST Pump, Fuel Injection Pump, Governor, HST Troubleshooting, Travel Motor, Sprocket, Parking Brake, Control Valve |
| Option | 367-372 | Cooler, Cooler Assembly, Compressor Assembly, Condenser Assembly, Cooler Unit Assembly |
| Colophon | 373 | - |
| Spine Title | 374 | - |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| General tightening torque for M10 x 1.5 bolts | 34.7 ±1.7 ft·lbf (47.1 ±2.4 N·m) | p. 57 |
| Hydraulic oil tank line filter replacement interval | Every 500 hrs. (After first 250 hrs.) | p. 45 |
| Hydraulic oil tank return filter replacement interval | Every 1000 hrs. (After first 50 hrs.) | p. 45 |
| Hydraulic oil recommended type | Anti-wear hydraulic oil ISO VG46 | p. 349 |
| Hydraulic oil capacity | 15.05 Gals. (57 L) | p. 349 |
| Battery type | FZ/75D23R | p. 32 |
| Battery voltage 5 hrs rate capacity | 24–64 V–A·h | p. 32 |
| Starter nominal voltage | 24 V | p. 33 |
| Braided hose (SL-06) inner diameter | 0.248 (6.3) in. (mm) | p. 22 |
| Braided hose (SL-06) thickness | 0.102 (2.6) in. (mm) | p. 22 |
| General caution for O-rings | Be careful not to twist O-rings. If an O-ring is twisted, remove the twist with the fingertips. | p. 19 |
| Seal replacement condition | If a seal is abnormal, replace it. | p. 181 |
Yanmar C50R-3(R) Common Problems This Manual Covers
Yanmar C50R-3R hydraulic functions become weak, slow, or stop working entirely after extended use. p. 45
Inspect the hydraulic oil tank line filter. Replace the filter every 500 hrs as specified on page 45 to prevent contamination. Check the hydraulic pump working pressure with the manual's test procedure (refer to Chapter 3 Servicing Standards for the applicable pressure specification). Drain and refill the system with 15.05 Gals. of fresh ISO VG46 anti-wear hydraulic fluid.
Manual Section: Chapter 3 Servicing StandardsEngine will not start or turns over intermittently when turning the key on the 24V system. p. 33
Test the battery voltage with a multimeter. Confirm a reading of at least 24 V as noted on page 33. Clean all battery terminals and inspect the starter circuit connections. If the starter motor fails to engage, check the wiring harness for continuity and replace any damaged sections immediately.
Manual Section: Chapter 2 Technical DataImplement or dump body moves erratically, drops while shifting, or does not hold position under load. p. 53
Measure the dump spool operating force. Verify it falls between 15.4 to 19.2 lbf as detailed on page 53. Check the control valve for internal leakage or spool seal damage. Torque the main relief valve to 20.3 to 23.1 ft·lbf following the instructions on page 242.
Manual Section: Chapter 3 Servicing StandardsTravel performance drops, tracks stall under load, or the crawler carrier fails to move straight. p. 51
Check the undercarriage components for excessive wear. Measure the track roller and shaft allowable limit, ensuring it does not exceed ø10.24 in. (260 mm) as shown on page 51. Inspect the HST system drive motors for leaks. Torque all M10 x 1.5 mounting bolts to 34.7 ±1.7 ft·lbf.
Manual Section: Chapter 3 Servicing StandardsFrequently Asked Questions
What are the torque specifications for the YANMAR C50R-3/R track roller bolts?
The manual specifies different torque values for track roller bolts. For bolts installing the track roller bracket (M12 x 1.5), the tightening torque is 75.2 ft·lbf (102 N·m) using Three Bond #1324. For the nut (3) with setscrew (13) that prevents the track roller from rotating, the tightening torque is 217 to 239 ft·lbf (294 to 324 N·m).
What are the torque specifications for the YANMAR C50R-3/R engine head bolts?
The tightening torque for the Cylinder head bolt (Class 1) (M13 x 1.5) is specified as 137.4 to 144.7 ft·lbf (186.3 to 196.1 N·m). It is important not to use an impact wrench to tighten these bolts to prevent sticking.
Where can I find the torque specifications in the YANMAR C50R-3/R service manual?
General and special tightening torque specifications for the YANMAR C50R-3/R can be found in Chapter 3, "Servicing Standards." Specifically, "3-7-1. Tightening Torque for Bolts and Nuts for Vehicle" starts on page 57, and "3-7-2. Tightening Torque for Bolts and Nuts for Engine" starts on page 59.
What are the replacement specifications for hydraulic filters in the YANMAR C50R-3/R?
The "Hydraulic oil tank line filter" (Part No. E1551102802) should be replaced every 500 hours, with the first replacement after 250 hours. The "Hydraulic oil tank return filter" (Part No. E1551000320) has a replacement interval of every 1000 hours, with the first replacement after 50 hours.
How quickly can I access this manual after buying?
You get a 374-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Can I print this manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Are electrical wiring diagrams included in this Yanmar C50R-3/R Service Manual?
Included. The Yanmar C50R-3/R Service Manual covers complete wiring harness diagrams, electrical circuits, and connector pinouts.
Document Quality
This document is a scanned PDF with an OCR layer, allowing you to search and copy the full text. The text quality is consistently crisp and easy to read throughout the manual. Diagrams and illustrations are primarily raster images, but their labels are clear and readable, even at higher zoom levels. Pages are generally clean with no significant scan artifacts, stains, or skewed content. There are several blank pages interspersed throughout the document, primarily serving as section dividers.
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