Kobelco shop manual S5PJ0028E01 applies to two hydraulic excavators, the SK50SR-5 and SK50SR-C, and runs 933 pages from machine specifications through a full engine teardown. Hydraulic circuit diagrams trace neutral, travel, slew and bucket flow through the control valve, while the electrical section, a solid share of this Kobelco SK50SR-5, SK50SR-C shop manual PDF, lays out harness routing, connector detail and the complete circuit diagram. Troubleshooting charts sort hydraulic, electrical and engine faults by symptom, and the travel chapter handles the crawler, rollers, front idler adjuster and sprocket. Each full turn of the main relief adjuster moves pressure 12.2 MPa (1770 psi); torque lock nut (2) to 28~31 N·m afterward, and condemn any travel motor draining 3 liters or more in 30 seconds. It's you and the machine, nobody to call. The PDF is bookmarked and text-searchable, and it prints cleanly, so the relief valve pages can sit on your bench and soak up hydraulic oil.
What's Inside This Kobelco SK50SR-5, SK50SR-C Manual
| System | Pages | Key Topics |
|---|---|---|
| SK50SR-5 Hydraulic Excavator Shop Manual | 1-7 | Revision History, General Safety Information, Machine Identification, Applicable Machines, Manual Part Number, Issue Date, Safety Precautions, Warning Labels, Operational Safety, Maintenance Safety |
| Outline | 10-17 | International Unit Conversion System |
| Specifications | 18-29 | Machine Dimensions, Engine Specifications, Hydraulic Components, Weight, Performance |
| Attachment Dimensions | 30-53 | Boom Dimensions, Arm Dimensions, Bucket Dimensions, Dozer Dimensions, Swing Bracket Dimensions |
| Tools | 54-65 | Torque Specifications, Capscrews, Hydraulic Hose Fittings, Lifting Jigs, Special Spanners |
| Standard Maintenance Time Table | 66-75 | Standard Maintenance Time, Equipment Portion, Work to Be Done |
| Maintenance Standards and Test Procedures | 76-95 | Engine Speed Measurement, Hydraulic Oil Pressure, Travel Performance, Slew Performance, Attachment Operating Performance |
| Hydraulic System | 96-155 | Electrical System, Hydraulic Circuit, Hydraulic Circuit Operation, Neutral Circuit, Travel Operating Circuit, Slew Operating Circuit, Bucket Operating Circuit, Circuit Diagram, Harness Connection, Electrical Equipment List, Harness and Cable List, Arrangement Drawing for Components and Harness, Detail of Harness and Cable |
| Components System | 156-229 | Hydraulic Pump, Pilot Valve, Control Valve, Slewing Motor, Travel Motor, Swivel Joint |
| General Disassembly and Assembly | 230-233 | Specification of Tightening Torque |
| Attachments | 234-265 | Removing and Installing, Attachment Assembly and Name, Bucket, Arm, Boom, Swing |
| Upper Slewing Structure | 266-485 | Travel System, Canopy and Cab, Guard and Cover, Floor Plate Assembly, Battery, Counterweight, Pump, Crawler, Upper Roller, Lower Roller, Front Idler, Idler Adjuster, Sprocket |
| Troubleshooting Hydraulic System | 486-495 | General Precautions, Trouble Diagnosis, Attachment, Travel Operation, Slewing Operation, Pump |
| Troubleshooting Electrical System | 496-507 | Trouble Diagnosis, General, Attachment Operation, Travel Operation, Deceleration |
| Troubleshooting Engine | 508-519 | Trouble Diagnosis, Starting Trouble, E/G Rotation Trouble, Output Drops Down, Other Trouble |
| Engine Introduction and Specifications | 520-543 | Engine Model Identification, Safety Precautions, Engine Specifications, Warranty Information |
| General Service Information | 544-581 | Component Identification, Emission Control Regulations, Diesel Fuel Specifications, Engine Oil Specifications, Engine Coolant Specifications |
| Engine Maintenance and Troubleshooting | 582-653 | Engine Speed Specifications, Periodic Maintenance Schedule, Maintenance Procedures, Troubleshooting Engine Rotation |
| Engine Disassembly and Assembly | 654-761 | Cylinder Head Disassembly, Rocker Arm Assembly, Valve Clearance Adjustment, Crankshaft and Camshaft Components, EGR System |
| Fuel System | 762-839 | Cooling System, Lubrication System, Fuel Injection Pump, Stop Solenoid, Cold Start Device, Fuel Injectors, Fuel System Diagram, Cooling System Diagram, Engine Coolant Pump Components, Thermostat Inspection, Radiator Cap Test, Lubrication System Diagram, Trochoid Oil Pump, Oil Pressure Check, Rotor Clearance Inspection |
| Turbocharger and Starter Motor | 840-913 | Turbocharger Components, Washing Procedure, Rotor Play Inspection, Starter Motor Specifications, Starter Motor Troubleshooting |
| Supporting Data | 914-933 | Hydraulic Circuit Diagram, Angle Dozer Specification, Hydraulic Circuit Operation, Electric Circuit Diagram |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Return Filter | Safety valve containing/Filter Type (30μ) | p. 22 |
| Main relief valve & Overload relief valve pressure adjustment per full turn | 12.2 MPa (1770 psi) | p. 85 |
| Tightening torque for lock nut (2) on main relief valve | 28~31 N·m (20.7~22.9 lbf·ft) | p. 86 |
| Standard value for drain rate of travel motor | 1.5 (0.40) or less liter (gal.) /30sec | p. 88 |
| Serviceability limit for drain rate of travel motor | 3 (0.79) or more liter (gal.) /30sec | p. 88 |
| Tightening torque of sems-bolt | 12 N·m (8.9 lbf·ft) | p. 84 |
| Tightening torque of battery ground cable clip nut (M10) | 46.1 N·m (34.0 lbf·ft) | p. 122 |
| Working pressure (Piston pump P1 + P2) | 22.5 MPa (3263 psi) | p. 158 |
| Working pressure (Gear pump P3) | 21.2 MPa (3074 psi) | p. 158 |
| Rubber shoe appropriate tension | 85~95mm (3.35~3.74 in) | p. 411 |
| Steel shoe appropriate tension | 130~150mm (5.12~5.91 in) | p. 411 |
| Travel motor reduction unit oil volume | 900 cc (55 cu•in) | p. 441 |
Kobelco SK50SR-5, SK50SR-C Common Problems This Manual Covers
Kobelco SK50SR-5 main relief valve set low, boom, arm and bucket operating slow and weak
Test main relief pressure at the P1, P2 and P3 circuits following the procedure on page 80; the SK50SR-5 standard is 23.0 MPa. If it is low, adjust the relief valve. One full turn shifts pressure 12.2 MPa (page 85). Torque the lock nut to 28~31 N·m afterward, as shown on page 86.
Manual Section: Maintenance Standards and Test Procedures p. 80Travel speed slow, travel motor showing abnormal heat and abnormal noise during travel
Measure travel motor drain rate following page 88. Standard is 1.5 L (0.40 gal) or less per 30 seconds; at 3 L (0.79 gal) or more the motor is at its serviceability limit. When reinstalling, torque the travel motor fixing capscrews to 181 N·m and refill the reduction unit with 900 cc (page 441).
Manual Section: Maintenance Standards and Test Procedures p. 88Crawler track running loose or overtight, tension out of spec at the idler adjuster
Measure track tension following page 411. On the SK50SR-5, rubber shoes should read 85~95 mm (3.35~3.74 in) and steel shoes 130~150 mm (5.12~5.91 in). Adjust at the idler adjuster grease nipple, then torque the nipple to 73.5 N·m (54.2 lbf·ft) as listed on page 441.
Manual Section: Travel System p. 411Front idler tread and flange worn, idler wobbling on its shaft bushing
Measure idler tread diameter and flange width against page 433. Tread standard is ø320 mm with a service limit of ø310 mm; flange width runs 40 mm new and 34 mm at limit. Check shaft to bushing clearance; the service limit is 2.0 mm. Refill the idler with 70~80 cc of oil on reassembly.
Manual Section: Travel System p. 433Starter does not rotate or turns slow, engine will not start on the key
Check the battery ground cable first and torque its M10 clip nut to 46.1 N·m (34.0 lbf·ft) as shown on page 122. Then work through the engine start failure chart beginning on page 496. If the starter still turns slow, move to the starter motor troubleshooting in the section starting at page 840.
Manual Section: Troubleshooting Electrical System p. 496Diesel engine output drops under load, with excessive exhaust smoke or white smoke
Test compression at 250 rpm first, against the SK50SR-5 spec of 3.4 ± 0.1 MPa listed on page 27. Then work the output drops down chart beginning on page 508. If compression holds, inspect turbocharger rotor play and follow its smoke diagnosis in the section starting at page 840.
Manual Section: Troubleshooting Engine p. 508Frequently Asked Questions
What is the cylinder head bolt torque on the Kobelco SK50SR-5 4TNV88 engine?
The Yanmar special torque chart gives 63 - 67 ft·lb (85.3 - 91.1 N·m) for the M10 x 1.25 mm cylinder head bolts on the 4TNV88 engine fitted to the SK50SR-5, with lubricating oil applied to the threads and seat. p. 678
What is the valve clearance on the Kobelco SK50SR-5 4TNV88 engine?
Intake and exhaust valve clearance on the SK50SR-5's Yanmar 4TNV88 engine is 0.2 mm (0.008 in), set with the engine cold. p. 27
What is the engine oil volume of the Kobelco SK50SR-5 4TNV88 engine?
The SK50SR-5 engine specifications list the engine oil volume as 7.4 liters (1.96 gal) maximum and 4.0 liters (1.06 gal) effective for the Yanmar 4TNV88 engine. p. 27
What is the compression pressure of the Kobelco SK50SR-5 4TNV88 engine?
The SK50SR-5 engine specifications give a compression pressure of 3.4 ± 0.1 MPa (500 ± 14 psi) at 250 rpm for the Yanmar 4TNV88 engine. p. 27
What is the correct procedure for bleeding air from the hydraulic cylinder?
After removing or installing a cylinder, start the engine and let it idle for about 5 minutes. Repeat the step of extending and retracting the cylinder 4 or 5 times at slow speed, moving the piston rod 100 mm (4 in) short of its stroke end to prevent the relief condition. p. 105
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