A swing that drifts or a boom that creeps parks your excavator until you find the cause, and this 912-page Kobelco SK220 shop manual PDF (OEM ID S5LQ0005E) is built for that job on the SK220 and SK220LC hydraulic excavators. Hydraulic schematics trace flow from the twin pumps through the control valve and pilot circuit to the swing motor, travel motors and cylinders, while wiring diagrams map the electrical and air-conditioner circuits. Troubleshooting is sorted by system, the engine section takes up over two fifths of the book, and pump, valve, swivel joint and reduction unit overhauls fill the last quarter. Set primary pilot pressure at RV13, where one turn of the adjust screw moves about 14.4 kgf/cm² (205 psi), then torque the sprocket cap screws to 57.5 ± 5.5 kgf·m (415 ± 40 ft-lbs). A wrong guess on a final drive buys a second teardown. The bookmarked, searchable file prints clean, so your bench copy can soak up hydraulic oil.
What's Inside This Kobelco SK220, SK220LC Manual
| System | Pages | Key Topics |
|---|---|---|
| Preventive Maintenance | 2-5 | Lubrication, Maintenance Guide, Operator's Manual, Safety Precautions |
| Specification | 6-21 | Name of Components, Specifications and Performance, Type of Shoes, Type and Combination of Attachments, Working Ranges of Attachments, Lifting-Up Ability Diagram |
| Location and Weight of Components | 22-27 | Location of Components, Weight of Components, Transportation Weight |
| Maintenance Standards and Test Procedures | 28-30 | Pressure Measurement, Engine Revolution, Circuit Pressure, Independent Relief Valves, Negative Control Relief Pressure, Cylinder Speed |
| Operation and Controls | 31-47 | Pressure Measurement and Adjustment, Cylinder Speed, Cylinder Oil Tightness, Swing Performance, Travel Performance |
| Troubleshooting | 48-71 | Drive System, Hydraulic System, Swing System, Travel System, Attachment System |
| Working Standards | 72-76 | Tightening Torques, Capscrews, Nuts, Sleeves, Screw Locking Compounds |
| Systems: Drive, Hydraulic, Swing, Travel, Attachments, Control, Upper Frame, Electrical, Air-Conditioner, Engine | 77-260 | Drive System, Hydraulic System, Swing System, Travel System, Electrical System, Air-Conditioner System, Engine Specifications |
| Engine: General, Lubrication, Fuel and Engine Control, Cooling, Intake and Exhaust, Engine Electrical, Clutch | 261-401 | Engine General, Lubrication System |
| Fuel and Engine Control | 402-485 | A Type Injection Pump, RSV Type Governor, RFD Type Governor, Feed Pump, Bleeding of Fuel System, Pump Drive Case, Injection Nozzle, Water Separator |
| Cooling System | 486-501 | Cooling Fan, Water Pump, Thermostat, Cleaning of Cooling System, Gas Leak Test, Bleeding the Cooling System |
| Intake and Exhaust | 502-533 | Air Cleaner, TO4B Type Turbocharger, Removal and Installation |
| Engine Electrical System | 534-610 | Vacuum Pump, Safety Relay, Intake Air Heater, Automatic Stop Device, Starter Relay |
| Clutch | 611-653 | Clutch Proper, Removal and Installation, Pressure Governor |
| Components: Hydraulic Pump, Control Valve, Hydraulic Motor, Swivel Joint, Hydraulic Cylinder, Reduction Unit | 654-912 | Hydraulic Gear Pump, Control Valve, Swing Control Valve, Hydraulic Motor, Swivel Joint, Hydraulic Cylinder, Reduction Unit |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Main relief pressure adjustment (tighten adjust screws) | 180 deg. | p. 36 |
| Primary pilot pressure adjustment (RV13) | 1 turn = 14.4 kgf/cm² (205 psi), 1/4 turn = 3.6 kgf/cm² (51.2 psi) | p. 40 |
| Clearance between piston and cylinder bore (D-d) | 0.035 mm (0.0014 in) | p. 684 |
| Gap between piston and caulked part of shoe (δ) | 0.1 mm (0.004 in) | p. 684 |
| Sprocket mounting cap screws torque | 57.5 ± 5.5 kgf·m (415 ± 40 ft-lbs) | p. 167 |
| Reduction unit mounting cap screws torque | 55 ± 5.5 kgf·m (397 ± 40 ft-lbs) | p. 167 |
| Rated revolution | 2150 rpm/min | p. 671 |
| Swing speed | 12 rpm | p. 11 |
| Engine oil volume (Engine body) | 24 L (6.34 gal) | p. 20 |
| SK220 | ||
| Displacement capacity | 97.2 (5.93) cc/rev (cuin/rev) x 2 | p. 671 |
| Fully-equipped weight | 22,900 kg (50,500 lbs) | p. 11 |
| SK220LC | ||
| Fully-equipped weight | 23,500 kg (51,800 lbs) | p. 11 |
Kobelco SK220, SK220LC Common Problems This Manual Covers
Kobelco SK220 excavator engine starts and runs normally but the machine does not operate
Check the drive system first by working through the troubleshooting chart on page 50 before you pull any components. Verify that engine speed reaches the high idle of 2,320 ± 20 rpm listed on page 20. Then listen for unusual noise from the drive system, which the chart uses to separate the possible causes.
Manual Section: Drive System Troubleshooting p. 50Hydraulic oil going cloudy with abnormal oil temperature rise and signs of cavitation during operation
Check the hydraulic oil condition and running temperature against the hydraulic system troubleshooting chart on page 51 before you swap any parts. Treat cloudy oil, abnormal temperature rise and cavitation as separate entries and work through each listed cause in order. Fix the root cause before you refill or run the machine hard again.
Manual Section: Hydraulic System Troubleshooting p. 51Low swing speed, swing does not stop, or abnormal noise while swinging the upper structure
Measure swing speed and compare it to the 12 rpm spec on page 11. If it is slow, or the swing will not stop, work through the swing system troubleshooting chart starting on page 52. If the motor is the suspect, check for insufficient brake torque or a revolution that does not rise, using the swing motor troubleshooting steps.
Manual Section: Swing System Troubleshooting p. 52Machine curves during straight travel, travel speed falls, or does not stop on a slope
Check travel performance and confirm which side is slow before you open any lines. Work through the travel system troubleshooting steps for a machine that curves or loses speed. Then test the travel motor for feeble running or a revolution that does not reach the set value. If the machine will not hold on a slope, inspect travel motor brake operation.
Manual Section: Travel System TroubleshootingBoom or arm cylinder drift with low action speed and weak digging power under load
Test main relief pressure in bucket digging and compare it to 290 +5/-0 kgf/cm² (4120 +70/-0 psi) on page 38. If it is out of range, adjust it using the main relief procedure on page 36. Then measure cylinder speed and check cylinder oil tightness to confirm whether the boom or arm cylinder is holding its load.
Manual Section: Attachment System TroubleshootingEngine hard to start, idling not smooth, or loss of power with dark exhaust
Check low idle against 650 ± 20 rpm and high idle against 2,320 ± 20 rpm on page 20 before you blame the hydraulics. Inspect exhaust color under load. If you see heavy whitish or dark exhaust gas, go to the intake and exhaust troubleshooting chart. For hard starting and rough idle, follow the engine troubleshooting steps.
Manual Section: Engine TroubleshootingFrequently Asked Questions
What are the main relief-pressure specifications for a Kobelco SK220?
The ATT. main relief valves (MR1 bucket digging, MR2 boom hoisting) are set to 290 kgf/cm² (4120 psi), tolerance +5/0, per the Performance Inspection Standard Table. In H mode no adjustment is needed while the pressure lies within 290~295 kgf/cm² (4120~4190 psi). p. 38
What is the engine compression pressure on the Kobelco SK220?
The SK220/SK220LC engine specification table lists compression pressure as 26 kgf/cm² (370 psi). p. 20
What is the valve clearance on the Kobelco SK220 engine?
Set both suction and exhaust valve clearance to 0.4 mm (0.016 in) with the engine cold, per the SK220/SK220LC engine specification table. p. 20
What is the engine oil capacity of the Kobelco SK220?
The Kobelco SK220/SK220LC engine body takes 24 liters (6.34 gal) of engine oil. p. 20
How do I adjust the fuel injection timing on the Kobelco SK220 (6D1 engine family)?
Loosen the attaching nuts. If injection timing is delayed, tilt the injection pump toward the crankcase; if it is too early, tilt it toward the opposite side. Moving the inscribed line on the timer flange by one division changes injection timing by 6°. p. 463
Is this Kobelco SK220 manual a download or a disc?
Straight to your device: 912 pages of searchable Shop Manual, downloadable the moment payment goes through.
Can I print specific sections of this Kobelco SK220 Shop Manual?
Yes. Print a single page or a chapter for your own shop use, on letter or A4.
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