Hydraulic pump, control valve, pilot valve, boom, arm, bucket and dozer cylinders, travel motor, slew motor and swivel joint: this 386-page Kobelco SK025, SK030, SK035 shop manual PDF (OEM ID S5RO0004E-00) takes each one through construction, disassembly, inspection and reassembly on these compact hydraulic excavators. Hydraulic schematics trace oil from the pump through the control valve and pilot circuit out to every actuator, and wiring diagrams cover the electrical side. Troubleshooting takes up close to a fifth of the book, sorted by travel, slewing, boom, arm and bucket faults, so you can trace a slow slew back to its cause before you pull a single hose. Set crawler tension to 68~78 mm, and confirm the SK025 travel motor relief at 210 kgf/cm² before you condemn the motor. Guess wrong and you tear that motor down twice. Search the text, jump by bookmark, or print the sections you need so the pages can sit on your bench and take the grease.
What's Inside This Kobelco SK025, SK030, SK035 Manual
| System | Pages | Key Topics |
|---|---|---|
| Service Manual | 1 | |
| Manual Overview | 5 | Systems, Troubleshooting, Sheet Numbers |
| Safety | 6-7 | Warning Plates and Decals, Battery Disconnection, Lifting Components, Welding Procedures, Asbestos Dust |
| General | 8-73 | Service Operations, Specifications |
| Systems | 74-139 | External View, Drive System, Slew System, Travel System, Upper Frame, Control System, Attachments, Hydraulic System |
| Hydraulic Pump (SK025) | 140-157 | Construction, Discharge Quantity Control Function, Disassembly and Assembly, General Cautions, Inspection and Adjustment, Troubleshooting |
| Hydraulic Pump (SK030, SK035) | 158-173 | Discharge Quantity Control Function, Special Tools, Rotary Group, Swash Plate, Gear Pump, Inspection and Adjustment |
| Control Valve | 174-193 | Main Relief Valve, Port Relief Valve, Anti-Cavitation Valve, Straight Travelling Valve, Slew Flow Control, Adjusting the Main Relief Valve Pressure, Troubleshooting |
| Solenoid Valve | 194-197 | Construction, Operation, Disassembly and Assembly, Checking the Parts, Troubleshooting |
| Pilot Valve | 198-207 | When the Handle Is Tilted, Table of Special Tools, Disassembly, Assembly, Parts Use Limits, Troubleshooting |
| Cylinder | 208-235 | Boom Cylinder, Arm Cylinder, Bucket Cylinder, Dozer Blade Cylinder, Swing Cylinder, Inspection |
| Travel Motor | 236-287 | Reduction Gear, Relief Section, Operation, Disassembly, Assembly |
| Slew Motor and Swivel Joint | 288-319 | Slew Motor Construction, Reduction Gear, Relief Valve, Swivel Joint Construction, Inspection |
| Troubleshooting | 320-386 | Overall Machine, Machine Travel, Slewing, Boom, Arm, Bucket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Pump Coupling Tightening Torque | 8.5-9.4 kgf-m | p. 83 |
| Check Valve Tightening Torque | 6 ± 1 kgf-m | p. 97 |
| Corrective Jig (E) Dimension A (SK030) | 90 mm | p. 234 |
| Crawler Tension | 68~78 mm | p. 50 |
| SK030/SK035 Engine Mount Tightening Torque | 2.7 kgf-m | p. 81 |
| Radiator Tightening Torque | 2.7 kgf-m | p. 82 |
| Piston and cylinder block assembly clearance | 0.05 mm or more | p. 156 |
| Slack of the piston shoe | 0.2 mm or more | p. 156 |
| Hydraulic Hose Fitting Torque (1/8) Union Nut (PF) | 1.0 +0.5/-0 kgf-m | p. 20 |
| SK025 | ||
| Travel Motor Relief Valve Set Pressure | [email protected] kgf/cm²@l/min | p. 39 |
| Rubber Crawler Weight (SK025) | Approx. 125 kg | p. 96 |
| SK030 | ||
| Rubber Crawler Weight (SK030) | Approx. 132 kg | p. 96 |
Kobelco SK025, SK030, SK035 Common Problems This Manual Covers
Kobelco SK025 SK030 SK035 excavator with no operations, no power, and hydraulic pump noise
Check hydraulic oil level before anything else; the tank holds 46 L on SK025, SK030 and SK035 (page 44). Then follow the overall machine troubleshooting steps. If the pump is noisy, inspect the pump coupling and torque it to 8.5-9.4 kgf-m per page 83.
Manual Section: Overall Machine TroubleshootingMachine travel impossible, travel speed drops, or faults show up when traveling in second gear
Measure crawler tension and set it within 68 to 78 mm per page 50 before chasing hydraulics. Then inspect the travel motor relief section and reduction gear following page 236. On the SK025 only, verify travel motor relief valve set pressure at 210 kgf/cm² at 1.2 l/min (page 39).
Manual Section: Travel Motor p. 236Upper structure will not slew, slews at low speed, overruns, or won't hold position on a slope
Inspect the slew motor relief valve first, following the slew motor construction and relief valve pages starting at page 288. Check the slew reduction gear, then inspect the swivel joint covered in the same section. Work through the slewing troubleshooting steps one symptom at a time so you only replace the part that failed.
Manual Section: Slew Motor and Swivel Joint p. 288Boom cylinder does not move, operates slowly, or boom drops by natural fall
Inspect the boom cylinder using the cylinder inspection steps starting on page 208. If the cylinder checks out, move to the control valve on page 174 and inspect it per its inspection procedure. Retighten any disturbed hose union nuts to the fitting torque table on page 20.
Manual Section: Cylinder p. 208Arm or bucket cylinder will not move, arm operates slowly, or either one drops by natural fall
Check the pilot valve first, following its inspection steps on page 198. Then inspect the arm or bucket cylinder per the cylinder section starting on page 208. If both check good, inspect the control valve on page 174 before ordering parts, so the crew is not waiting on the wrong component.
Manual Section: Pilot Valve p. 198SK025 hydraulic pump worn internally, with piston shoe slack and valve plate scratches found at inspection
Measure piston to cylinder block clearance and treat 0.05 mm or more as over the limit listed on page 156. Check piston shoe slack against the 0.2 mm limit, and inspect the valve plate sliding surface for scratches past 0.02 mm. On reassembly, torque socket bolts to 5.5 to 6.5 kgf-m (page 153).
Manual Section: Hydraulic Pump (SK025) p. 156Frequently Asked Questions
What are the replacement specifications for the main hydraulic pump on the SK025?
The main hydraulic pump for the SK025 is a variable delivery, 2-piston + gear pump (Model PVD-1B-23L3-7G-2232A). It has a rated discharge volume of 28.75 + 28.75 + 18.97 l/min and a rated pressure of 210 kgf/cm² for P1 and P2, and 180 kgf/cm² for P3. p. 37
What is the tightening torque for the main relief valve housing on the Kobelco SK025, SK030, SK035 control valve?
The housing tightening torque for the main relief valve on the control valve is 6.5 kgf-m. p. 185
How much gear oil is required for the travel motor reduction gear on the SK030?
The travel motor reduction gear for the SK030 requires approximately 800cc of gear oil. p. 282
What is the tightening torque for the slew motor mounting bolts on the Kobelco SK025, SK030, SK035?
The slew motor mounting bolt tightening torque is 10.4 ± 0.52 kgf-m. p. 90
How quickly can I access this Kobelco SK025 manual after buying?
You get a 386-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Can I print a copy of this Kobelco SK025 Shop Manual for the shop?
Zero restrictions. The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
Can I find hydraulic circuit diagrams in this Kobelco SK025 manual?
The Kobelco SK025, SK030, SK035 Shop Manual includes full hydraulic circuit diagrams, valve body layouts, and component specs. There is one on page 126, for example.
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