This download is the complete SK25SR-2 service set: the 599-page factory Shop Manual plus two Parts Manuals, one for serial range PV08-20001 and up, one for PV09-22001 and up. Check your machine number before ordering parts. The Shop Manual covers one machine and every diesel bolted into it: the 2/3TNE68, 3TNE74, 3TNE78A, 3TNE82A, 3/4TNE82, 3/4TNE84(T), and 3/4TNE88 engines. You get hydraulic circuit diagrams for every function (neutral, travel, slew, boom, arm, and the combined circuits), electric circuit diagrams with harness connection drawings, and a troubleshooting section that walks slow travel, weak slew, and attachment failures back to the guilty component. Cylinder teardown, boom and arm removal, maintenance standards with service limits: it is all here, step by step. Torque the battery terminal to 0.45 kgf-m, then confirm the 3.5L engine oil and 2.7L coolant capacities before you fire it up. No more chasing wiring faults with a multimeter and a prayer. Bookmarked and searchable; jump straight to any circuit on your phone.
What's Inside This Kobelco SK25SR-2 Manual
| System | Pages | Key Topics |
|---|---|---|
| Specifications | 14-29 | Components Name, Machine Dimensions, Specifications and Performance, Machine & Components Weight, Transportation, Type of Crawler Shoes, Type of Bucket, Machine Lifting Procedure |
| Attachment Dimensions | 30-45 | Boom (Dimension, Maintenance Standards), Arm (Dimension, Bucket (Dimension, Detail Dimension of Lug Section, Detail Dimension of Boss Section) |
| Tools | 46-54 | Torque Specifications for Capscrews and Nuts, Screw Sizes to Tool Sizes, Torque Specifications for Joints and Hoses, Torque Specifications for Sleeve Type Tube Fittings, Plugs |
| Standard Maintenance Time Table | 55-62 | Preface |
| Maintenance Standards and Test Procedures | 63-78 | How to Use Maintenance Standards and Precautions, Performance Inspection Standard Table, Measuring Engine Speed, Measuring Hydraulic Oil Pressure, Measuring Travel Performances |
| Hydraulic System | 79-113 | Summary, Hydraulic Circuits and Components (Standard Circuit Diagram) |
| Electrical System | 114-276 | How to Read Circuit Diagram and Harness Connection, Electric Circuit Diagram |
| Whole Disassembly and Assembly | 277-279 | Explaining Chapter of Whole Disassembly and Assembly, Form for Chapter of Disassembly and Assembly, Indication of Tightening Torque |
| Attachments | 280-291 | Attachment Assy and Name, Bucket (Removal of Bucket, Installation of Bucket, Clearance Between Bucket and Arm), Arm (Removal of Arm, Installation of Arm) |
| Disassembling and Assembling Components | 292-478 | Cylinder (Necessary Tools, Construction, Disassembly, Disassembly of Piston Rod Assy, Disassembly of Piston Assy, Disassembly of Cylinder Head Assy, Removal of Wiper Ring, Removal of Bushing, Disassembly of Clevis Portion, Assembly, Assembling Clevis Portion, Assembling Cylinder Head, Assembling Cylinder Head Assy, Assembly of Piston Portion, Installation of Piston Rod Assy, Assembly of Cylinder, Maintenance Standards, Service Limit, Inspection After Assembly, Jig List) |
| Troubleshooting Hydraulic System | 479-488 | Troubleshooting at Site, Gear Pump Failure, Swing Cylinder Failure, Control Valve Spool Checks, Travel Motor and Travel Pilot Valve, Lever Lock Solenoid, Check Valve Inspection, Attachment Operating Faults |
| Troubleshooting Electrical System | 489-498 | Attachment Operational Failure, Attachment Speed Is Slow, Attachment Operating Power Is Low, Malfunction of Attachment, Travel Operation Error, Travel Speed Is Slow |
| Troubleshooting Engine | 499-508 | Trouble Diagnosis Engine, Compression Pressure Check, Glow Plug Circuit Test, Air Cleaner and Air Suction System, Battery and Electrolyte Check, Control Rack, Cooling System and Coolant Level, Engine Speed Adjustment |
| Engine | 509-599 | Preface, Contents, Specifications and Performance (2TNE68, 3TNE68, 3TNE74, 3TNE78A, 3TNE82A, 3TNE82, 3TNE84, 3TNE88, 4TNE82) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Maximum torque | 60.8-65.7 N·m | p. 28 |
| Accelerator wire adjustment torque | 2.35 kgf-m (17 lbf-ft) | p. 68 |
| V-belt Deflection | 10-15 mm | p. 545 |
| SK25SR-2 | ||
| Engine Rated Output | 13.2 kW | p. 18 |
| Engine Oil Volume (Max) | 3.5 L | p. 28 |
| Cooling Water Capacity (Max) | 2.7 L | p. 28 |
| Slewing Speed | 9.4 rpm | p. 18 |
| Fuel Tank Capacity | 25 L | p. 325 |
| Hydraulic Tank Capacity | 27 L | p. 326 |
| 3TNE74 | ||
| Engine Oil Capacity (3TNE74) | 2.4 L | p. 517 |
Kobelco SK25SR-2 Common Problems This Manual Covers
Kobelco SK25SR-2 pulls to one side during travel, one track weak or dead under load
Check track tension on both sides first; uneven sag makes the machine crab. Confirm the 27 L hydraulic tank is topped up, then measure travel circuit pressure using the test procedures starting on page 63. If one side reads low, work through the travel valve and swivel joint checks on page 481.
Manual Section: Troubleshooting Hydraulic System p. 481Slow weak digging, boom and arm feel underpowered even at full throttle
Check the accelerator wire adjustment first; a stretched cable keeps the engine off rated speed. Torque the wire locknut to 2.35 kgf-m (17 lbf-ft) as shown on page 68. If engine speed checks out, measure pump pressure with the test procedures starting on page 63, then follow the pump and regulator diagnosis on page 481.
Manual Section: Troubleshooting Hydraulic System p. 481Engine will not start or cranks slowly, starter just clicks even with a good battery
Check battery terminal torque first; a loose clamp mimics a dead battery. Tighten terminals to 0.45 kgf-m (3.3 lbf-ft) per page 126, then verify the starter B terminal is torqued to 0.9 kgf-m (6.49 lbf-ft), page 131. Still no crank, test the safety relay and starter circuit through the steps beginning on page 489.
Manual Section: Troubleshooting Electrical System p. 489Engine runs hot on dusty sites, alternator belt squeals and charge light flickers
Inspect the alternator belt and set deflection to 10-15 mm under thumb pressure, spec on page 545. Blow out the radiator fins from the engine side; dusty sites pack them fast. Drain and refill cooling water to the 2.7 L capacity listed on page 28, and replace the air filter element while the panels are off.
Manual Section: Engine p. 545Swing feels weak and jerky, upper structure groans or chatters mid rotation
Drain a hydraulic oil sample and check it for iron filings; glitter means the slew motor is wearing internally. Time a full 360 degree swing and compare against the 9.4 rpm slewing spec on page 18. If speed is down, follow the slewing troubleshooting procedure starting on page 479 before pulling the motor.
Manual Section: Troubleshooting Hydraulic System p. 479Frequently Asked Questions
What is the tightening torque for the main relief valve lock nut on the control valve?
The tightening torque for the lock nut (2) on the main relief valve is 2 kgf-m (14 lbf-ft). p. 70
What is the standard intake and exhaust valve head clearance for the engine?
The standard intake and exhaust valve head clearance for all models is 0.15 to 0.25 mm. p. 94
What is the specified tension for the V-belt on the engine?
The V-belt tension is acceptable if the deflection is 10 to 15 mm when pushed at the center between the alternator and cooling water pump. p. 95
What is the standard compression pressure for the 3TNE74 engine?
The standard compression pressure for the 3TNE74 engine is 35 +/- 1 kgf/cm2 at 250 rpm. p. 92
What is the required oil capacity for the travel motor reduction gear?
The required oil capacity for the travel motor reduction gear is 350 cc (21.4 cu-in) of GEAR OIL SAE #90. p. 149
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