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Wrenching on a Kobelco SK30SR-2 or SK35SR-2? This 651-page Kobelco Shop Manual (OEM #S5PW0002E) covers both hydraulic excavator models front to back, and it downloads as a PDF the minute you pay. Inside: full electric circuit diagrams with harness and cable lists, hydraulic circuit schematics with complete piping layouts, and dedicated troubleshooting sections for the hydraulic, electrical, and engine systems. You also get teardown and assembly procedures for the hydraulic pump, control valve, slewing motor, travel motors, and swivel joint, plus maintenance standards for checking engine speed, oil pressure, and crawler tension. Set the main relief valve to 230 kgf/cm2 (3270 psi), then torque the M12 travel motor socket bolts to 10.4 kgf-m (75 lbf-ft). A dead excavator earns nothing. Bookmarked by system, so you can jump straight to the right section on any device in the shop.
What's Inside This Kobelco SK30SR-2, SK35SR-2 Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety Precautions | 4-6 | General Safety Information, Warning Labels, Maintenance Precautions, Welding Repair, Environmental Measures |
| Specifications | 15-41 | Components Name, Machine Dimensions, Specifications and Performance, Machine & Components Weight, Transportation, Type of Crawler Shoes, Type of Bucket, Machine Lifting Procedure |
| Attachment Dimensions | 42-65 | Boom, Arm, Bucket, Dozer, Swing |
| Tools | 66-74 | Torque Specifications, Screw Sizes, Special Spanners, Screw Locking Compounds, Counterweight Lifting Jig |
| Standard Maintenance Time Table | 75-82 | Attachment, Canopy and Guard, Upper Structure, Under Carriage |
| Maintenance Standards and Test Procedures | 83-100 | Engine Speed, Hydraulic Oil Pressure, Travel Performances, Slew Performances, Attachment Operating Performances, Crawler Tension |
| Hydraulic System | 101-135 | Hydraulic Circuits, Hydraulic Circuit Operation, Schematic Piping |
| Electrical System | 136-208 | Electric Circuit Diagram, Electrical Equipment List, Harness and Cable List, Components and Harness Arrangement |
| Components System | 209-303 | Hydraulic Pump, Pilot Valve, Control Valve, Slewing Motor, Travel Motor, Swivel Joint |
| Whole Disassembly and Assembly | 304-306 | Disassembly and Assembly Procedures, Tightening Torque, Hydraulic Equipment, Upper Slewing Structure, Travel System |
| Attachments | 307-336 | Attachment Assembly and Name, Bucket, Arm, Boom, Swing, Dozer, Cylinder |
| Upper Slewing Structure | 337-455 | Canopy and Cab, Guard, Floor Plate Assembly, Battery, Seat Stand, Counterweight, Fuel Tank, Hydraulic Oil Tank |
| Travel System | 456-530 | Crawler, Upper Roller, Lower Roller, Front Idler, Idler Adjuster, Sprocket, Travel Motor, Slewing Bearing |
| Troubleshooting Hydraulic System | 531-540 | Attachment Operational Failure, Attachment Speed, Attachment Operating Power, Travel Operation, Travel Speed, Slewing Operational Failure, Slewing Speed, Slewing Operating Power |
| Troubleshooting Electrical System | 541-550 | Engine Does Not Start, Horn Does Not Sound, Working Light, Hourmeter, Fuel Gauge, Water Temperature, Control Function, Travel Speed Change |
| Troubleshooting Engine | 551-560 | Starter Not Rotate, Starter Rotates But Hard to Start, Idling Trouble, Medium Speed Trouble, High Speed Trouble, Engine Output Not Enough, Knocking at High Temperature |
| Engine | 561-651 | Specifications and Performance, Cross Sectional Views, Cooling Water, Lubricating Oil, Fuel Oil, Troubleshooting, Special Service Tools, Measuring Instruments |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Main relief valve pressure (SK30SR-2) | 230 +5/0 kgf/cm² (3270 +70/0 psi) | p. 86 |
| Main relief valve pressure (SK35SR-2) | 230 +5/0 kgf/cm² (3270 +70/0 psi) | p. 86 |
| Tightening torque for pressure switch | 2.2 kgf·m (16 lbf·ft) | p. 157 |
| Tightening torque for panel assembly | 4.6 kgf·m (33 lbf·ft) | p. 155 |
| Tightening torque for travel motor fixing socket bolt M12 | 10.4 kgf·m (75 lbf·ft) | p. 482 |
| Volume of oil (travel motor reduction unit) | 750cc (46 cu·in) | p. 482 |
| Engine Oil Volume (Max/Effective) | 3.9 / 1.2 liters | p. 38 |
| Cooling Water Capacity (Max/Engine) | 2.5 / 1.8 liters | p. 38 |
| SK30SR-2 | ||
| Slewing Speed, SK30SR-2 | 9.0 rpm | p. 22 |
| Engine Output Rating, SK30SR-2 | 23 PS / 2,300 rpm | p. 22 |
| SK35SR-2 | ||
| Slewing Speed, SK35SR-2 | 8.6 rpm | p. 22 |
| Engine Output Rating, SK35SR-2 | 24 PS / 2,400 rpm | p. 22 |
Kobelco SK30SR-2, SK35SR-2 Common Problems This Manual Covers
Kobelco SK30SR-2 SK35SR-2 hydraulic functions weak and slow, boom struggles to lift a loaded bucket
Check hydraulic oil level first, then tee a gauge into the P1 port and verify main relief pressure reaches 230 kgf/cm2 (3270 psi) using the test procedure on page 86. If pressure checks good but functions stay slow, work the attachment and pump troubleshooting charts on page 531 to isolate clogged filters, suction leaks, or pump wear.
Manual Section: Troubleshooting Hydraulic System p. 531Controller flashes B-1 or B-2 fault codes, boom response erratic or dead in one direction
Inspect the boom pressure sensor connectors for corrosion, chafed wires, and loose pins, tracing the circuit on the wiring diagram. Test the sensor and harness for continuity before replacing parts. When installing a new pressure switch, torque it to 2.2 kgf·m (16 lbf·ft) per page 157, then cycle the boom and confirm the code clears.
Manual Section: Electrical SystemHydraulic oil foaming in the tank after filter or hose service, cylinders judder and creep
Fill the tank to the correct mark, start the engine, and cycle boom, arm, bucket, slew, and both travel circuits slowly through full stroke to purge trapped air. Tighten any weeping suction fittings at the pump inlet. Once the foam clears, confirm the system still builds 230 kgf/cm2 (3270 psi) at relief per the procedure on page 86.
Manual Section: Maintenance Standards and Test Procedures p. 86Machine pulls to one side, left or right track slow or dead on level ground
Swap the travel lines at the swivel joint; if the fault follows the hose, look upstream at the control valve instead of the motor. Drain the reduction gear case, which holds 750cc (46 cu·in), and check the oil for metal. Retorque the M12 travel motor mounting socket bolts to 10.4 kgf·m (75 lbf·ft) per page 482.
Manual Section: Travel System p. 456Engine cranks slowly in cold weather or will not start at all after sitting overnight
Test battery voltage under load and clean the ground strap connections before condemning the starter, following the engine troubleshooting charts starting on page 551. Verify oil level; the sump takes 3.9 liters maximum, and overfilled or heavy oil drags cranking speed in the cold. If hard starting continues, set valve clearance to 0.2 mm (0.008 in) cold.
Manual Section: Troubleshooting Engine p. 551Frequently Asked Questions
What are the torque specifications for the final drive sprocket mounting bolts on the SK30SR-2 and SK35SR-2?
The torque specification for the socket bolts (M12) used to mount the sprocket to the travel motor is 10.4 kgf·m (75 lbf·ft). p. 482
What is the standard valve clearance for the engine on the SK30SR-2 and SK35SR-2?
The standard valve clearance for both intake and exhaust valves on all models is 0.15 to 0.25 mm when the engine is in a cold state. p. 595
What is the standard fuel injection timing for the 3TNE82A engine?
The standard fuel injection timing for the 3TNE82A engine is 12 ± 1 degrees before top dead center (b.T.D.C.). p. 38
What is the capacity of the hydraulic oil tank for the SK30SR-2 and SK35SR-2?
The hydraulic oil tank capacity is approximately 37 liters (9.8 gal). p. 354
What is the standard compression pressure for the 3TNE82A engine?
The standard compression pressure for the 3TNE82A engine is 35 ± 1 kgf/cm² (500 ± 14 psi) at 250 rpm. p. 38
How is this Kobelco SK30SR-2 Shop Manual delivered?
Instant PDF download. You get the full 651-page scanned Shop Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Am I able to print pages from this Kobelco SK30SR-2 manual?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
