All 818 pages of this Kobelco SK25SR, SK30SR, SK35SR Shop Manual PDF cover one family of machines: the short-radius hydraulic excavators that earn their keep in tight quarters. You get full hydraulic pump teardown and rebuild procedures, control valve and pilot valve maintenance standards, slewing and travel motor service, plus complete circuit diagrams with harness connections and component arrangements. A dedicated troubleshooting section walks the engine group, pump group, travel, slewing, and attachment systems fault by fault. Torque the travel unit mounting capscrews to 10.4 kgf·m (75 ft·lbs) and snug the 1/4 PF O-ring fittings to 3.5 kgf·m before you button up the undercarriage. Mini excavators don't forgive guesswork on pilot pressures. Bookmarked by section, so you can jump straight to the system sitting on your bench; opens on any device you carry into the shop.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Preventive Maintenance | 5 | |
| Specification | 6-43 | Name of Components, General Dimensions, Specifications and Performance |
| Location and Weight of Components | 44-52 | Location of Components, Weight of Components, Weight of Attachments |
| Maintenance Standards and Test Procedures | 53-66 | Maintenance Standard, Standards for Judging Performance, Test Procedures |
| Working Standards | 67-232 | Name of Components, Specifications and Performance, Type of Shoes, Type of Buckets, Working Ranges of Attachments, Lifting Diagram, Engine Specifications, Engine Performance Curves |
| Operator Control and Engine Control | 233-248 | Operating Lever, Switch Layout, Monitor Panel, Engine Control, Deceleration Control |
| Major Electrical Equipment | 249-266 | Electrical Equipment List, Battery, Alternator, Fuse Box, Sensors, Relays |
| Electric System | 267-293 | Circuit Diagram, Harness Connection, Components Arrangement, Relay Assembly, Cab Harness |
| Troubleshooting | 294-309 | Trouble Diagnostic List, Engine Group, Pump Group, Travel System, Slewing System, Attachment System |
| Hydraulic Pump | 310-363 | Hydraulic Pump Specifications, Construction, Operation, Removal and Installation, Maintenance Standards |
| Control Valve and Pilot Valve | 364-424 | Control Valve Specifications, Relief Valve, Pilot Valve, Removal and Installation, Maintenance Standards |
| Slewing Motor and Travel Motor | 425-599 | Slewing Motor Unit, Travel Motor Unit, Reduction Gear, Parking Brake, Hydraulic Timer |
| Hydraulic Cylinder and Engine Service | 600-818 | Hydraulic Cylinder Construction, Removal and Installation, Engine Service Manual, Fuel Injection Pump, Governor, Turbocharger |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Tightening torque for 1/8 PF screw (O-ring type) | 2.0±0.2 kgf·m | p. 71 |
| Tightening torque for 1/4 PF screw (O-ring type) | 3.5±0.5 kgf·m | p. 71 |
| Tightening torque for socket bolts (5) on hydraulic pump | 9.7±0.5 kgf·m (70±4 ft·lbs) | p. 134 |
| Tightening torque for travel unit mounting capscrews | 10.4 ± 1.0 kgf·m (75 ± 7 ft·lbs) | p. 171 |
| Tightening torque for M12 bolts | 9~11.5kgf·m (65~83ft·lbs) | p. 554 |
| Tightening torque for ring nut (104) | 20 ± 1.0 kgf·m (145 ± 7 ft·lbs) | p. 576 |
| SK25SR | ||
| Travel Motor Reduction Gear Oil Capacity, SK25SR | 600cc | p. 172 |
| SK35SR | ||
| Travel Motor Reduction Gear Oil Capacity, SK35SR | 700cc | p. 172 |
