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Wrenching on a Kobelco SK15SR or SK20SR? This 771-page Kobelco SK15SR, SK20SR Shop Manual PDF (OEM #S5PM0002E) covers the 1997-1999 Hydraulic Excavator line front to back. Inside: full electric system circuit diagrams with harness connections, hydraulic pump and control valve teardowns, slewing and travel motor rebuilds, plus a trouble diagnostic list spanning engine, pump, travel, slewing, and attachment groups. You also get working standards, lifting diagrams, and a complete engine service section with step-by-step disassembly and reassembly. Torque the slewing bearing capscrews to 85 ± 9 ft-lbs and fill the hydraulic system with 45 L (12 gal) of oil. Each machine even gets its own pump seal torque (34 vs 48 ft-lbs). Your excavator is down and the forums are guessing. This bookmarked PDF opens on any device; grab your tablet, walk to the machine, and start wrenching.
What's Inside This Kobelco SK15SR, SK20SR Manual
| System | Pages | Key Topics |
|---|---|---|
| Specification | 7-30 | Name of Components, General Dimensions, Specifications and Performance |
| Location and Weight of Components | 31-39 | Location of Components, Weight of Components, Weight of Attachments |
| Maintenance Standards and Test Procedures | 40-51 | How to Use the Maintenance Standard, Standards for Judging Performance, Test Procedures |
| Working Standards | 52-60 | Name of Components, Specifications and Performance, Type of Shoes, Type of Buckets, Working Ranges of Attachments, Lifting Diagram, Engine Specifications, Engine Performance Curves |
| Preventive Maintenance | 61-188 | - |
| Operator Control and Engine Control | 189-200 | Operating Lever, Switch Functions, Monitor Panel, Engine Control, Deceleration Control |
| Major Electrical Equipment | 201-213 | Electrical Equipment List, Battery, Alternator, Glow Plug, Sensors, Switches |
| Electric System | 214-231 | Circuit Diagrams, Harness Connections, Components Arrangement, Boom Work Light |
| Troubleshooting | 232-246 | Trouble Diagnostic List, Engine Group, Pump Group, Travel System, Slewing System, Attachment System |
| Components: Hydraulic Pump and Control Valve | 247-332 | Hydraulic Pump Construction, Control Valve Operation, Relief Valve Maintenance, Troubleshooting |
| Components: Pilot Valve and Solenoid Valve | 333-355 | Pilot Valve Construction, Pilot Valve Maintenance, 2-Function Solenoid Valve, Relief Valve |
| Components: Slewing Motor, Travel Motor, and Hydraulic Cylinder | 356-471 | Slewing Motor Unit, Travel Motor Unit, Hydraulic Cylinder Construction, Cylinder Maintenance |
| Mounting Breaker/Nibbler and Engine Service Manual | 472-771 | Breaker/Nibbler Modification, Hydraulic Circuit, Engine Specifications, Engine Maintenance, Disassembly and Reassembly |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Hydraulic oil capacity | 45 L (12 gal) | p. 34 |
| SK15SR pump oil seal installation torque | 4.7±0.5kgf·m (34±4ft·lbs) | p. 101 |
| SK20SR pump oil seal installation torque | 6.6±0.6kgf·m (48±4ft·lbs) | p. 101 |
| Tightening torque of slewing bearing capscrews | 11.7 ± 1.2 kgf·m (85 ± 9 ft·lbs) | p. 137 |
| Tightening torque of sprocket mounting capscrews | 5.6 ± 0.5 kgf·m (41 ± 4 ft·lbs) | p. 133 |
| Tightening torque of swivel joint mounting capscrews | 3.4 ± 0.13 kgf·m (26 ± 1 ft·lbs) | p. 136 |
| Tightening torque of swivel joint lock plate | 11.7 ± 1.2 kgf·m (85 ± 9 ft·lbs) | p. 136 |
| Pressure plate (14) thickness | 3.930mm | p. 261 |
| Hydraulic oil application amount | 2-3cc | p. 257 |
| Return filter replacement interval (1st) | 25h | p. 507 |
| Return filter replacement interval (2nd) | 100h | p. 507 |
| Engine Oil Volume (Max/Effective) | 2.4 L / 1.0 L | p. 29 |
Kobelco SK15SR, SK20SR Common Problems This Manual Covers
Kobelco SK15SR hydraulic pump not building pressure, no oil delivered, boom slow and weak
Check the hydraulic tank level first; the system holds 45 L (12 gal), noted on page 34. Drain and inspect the suction strainer for sludge that starves the pump. If pressure still won't build, pull the pump and measure the pressure plate; replace it if thickness falls below 3.930 mm, per page 261.
Manual Section: Components: Hydraulic Pump and Control Valve p. 261Oil leaking from center swivel joint area, fresh stains under belly covers after digging
Clean the belly pan and run each function to confirm the leak source before pulling parts. Replace the swivel joint seals if oil weeps at the center joint; shaft-to-body clearance is only 0.1 mm (0.004 in), so insert the shaft straight along the axis, per page 425. Torque the mounting capscrews to 3.4 kgf·m (26 ft·lbs) from page 136.
Manual Section: Components: Slewing Motor, Travel Motor, and Hydraulic Cylinder p. 425One track slower than the other, machine pulls to one side on flat ground
Swap the travel lines side to side at the swivel joint; if the weak side follows the hose, the fault is upstream in the joint or valve, not the motor. Work the diagnostic charts starting on page 236 to isolate pilot pressure faults. Inspect the swivel joint for internal bypass; shaft clearance runs about 0.1 mm (0.004 in).
Manual Section: Troubleshooting p. 236Hydraulic functions sluggish and jerky, pump whines under load in hot weather
Drain and refill the hydraulic tank with 45 L (12 gal) of clean oil if the fluid looks milky or smells burnt. Replace the return filter at 25 hours on a fresh system, again at 100 hours, then every 200 hours; change the oil every 600 hours after that, per the schedule on page 507.
Manual Section: Preventive Maintenance p. 507Engine overheats and pushes coolant out of the reservoir during long trenching cycles
Test the radiator cap first; it must hold 0.9 kgf/cm² (12.8 psi), listed on page 668. Verify coolant is full: the engine holds 1.1 L and the radiator 2.0 L, from page 29. Blow debris out of the core fins and check fan belt tension before condemning the water pump.
Manual Section: Mounting Breaker/Nibbler and Engine Service Manual p. 668Frequently Asked Questions
What are the torque specifications for the track motor bolts on the SK15SR and SK20SR?
The tightening torque for the travel unit mounting capscrews (M12) is 5.6 ± 0.5 kgf·m (41 ± 4 ft·lbs). p. 134
What are the replacement specifications for the hydraulic oil?
The hydraulic oil tank capacity is 30 liters (7.9 gallons) for the SK15SR and SK20SR. The return filter should be replaced every 200 hours. p. 34
What is the standard tightening torque for the cylinder head bolts on the 3TN72E engine?
The tightening torque for the cylinder head clamping bolts on the 3TN72E engine is 6.0 - 6.5 kgf·m (43.4 - 47 ft·lbs). p. 761
What is the standard valve clearance for the engine when cold?
The standard intake and exhaust valve clearance for the engine when cold is 0.2 mm (0.0079 in). p. 561
What is the standard belt tension for the radiator fan belt?
The standard belt tension for the radiator fan belt is a play of 10 - 15 mm (0.4 - 0.6 in) when pressed hard with fingers. p. 669
Is this Kobelco SK15SR, SK20SR Shop Manual a digital download?
A 771-page Shop Manual in scanned PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Am I able to print pages from this Kobelco SK15SR, SK20SR manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
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