Built for one machine, the Kobelco SK50SR-3 hydraulic excavator, this Kobelco SK50SR-3 service manual PDF runs 754 pages under factory publication number S5PJ0009E-01. Hydraulic circuit operation gets a long chapter of its own, tracing the travel and bucket circuits, while disassembly and assembly procedures fill roughly a third of the book. Near the back, hydraulic and electric circuit diagrams let you follow a line from pump to cylinder or from key switch to starter, and the troubleshooting section splits hydraulic faults from electrical ones, with the engine getting its own chapter on inspection, adjustment and diagnosis. Check your engine work against a four-cylinder, 88 x 90 mm bore and stroke rated at 30.4 kW at 2,400 min⁻¹, and torque a 1/8 PF O-ring pipe joint to 17 ± 2 N·m. A travel fault with no circuit diagram can eat a whole shift. Print what the job calls for and let it get greasy at the bench; the bookmarked, text-searchable original stays clean.
What's Inside This Kobelco SK50SR-3 Manual
| System | Pages | Key Topics |
|---|
| Outline | 10-17 | General Precautions for Repairs |
| Specifications | 18-29 | Machine Dimensions, Machine and Components Weight, Engine Specifications |
| Installation Procedures for Optional Attachment | 30-65 | Boom Dimensional Drawings, Arm Dimensional Drawings, Bucket Dimensional Drawings |
| Maintenance | 66-95 | Standard Working Time Table |
| System | 96-235 | Hydraulic Circuit Operation, Travel Operating Circuit, Bucket Operating Circuit |
| Disassembling | 236-485 | General Disassembly and Assembly |
| Troubleshooting | 486-519 | Trouble Diagnosis Hydraulic, Troubleshooting Hydraulic System, Troubleshooting Electrical System |
| Engine | 520-735 | Engine Specifications, Inspection and Adjustment, Troubleshooting Engine |
| Supporting Data | 736-754 | Hydraulic Circuit Diagram, Electric Circuit Diagram |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| Metric Coarse Thread Standard Tightening Torque (M6, 4.8T, No lubrication) | 4.4 ± 0.5 N·m | p. 56 |
| Metric Coarse Thread Standard Tightening Torque (M27, 10.9T, Oil lubrication) | 1370 ± 137 N·m | p. 56 |
| Return Filter | Safety valve containing/Filter Type (30μ) | p. 22 |
| Joints for Piping (O-ring sealing type) Tightening torque (1/8 PF) | 17 ± 2 N·m | p. 58 |
| Number of cylinders-Bore x Stroke | 4 - 88 mm x 90 mm (3.46 in x 3.54 in) | p. 27 |
| Total Displacement | 2.189 L (134 cu·in) | p. 22 |
| Travel motor rated output torque (1st / 2nd) | 5710 / 3280 N·m (4211 / 1033 lb·ft) | p. 198 |
| Travel motor rated operating pressure | 23.0 MPa (3340 psi) | p. 198 |
| Link pitch (Reference value) | 135 mm (5.32 in) | p. 416 |
| Link pitch (Repairable level) | 139 mm (5.47 in) | p. 416 |
| Tightening torque of capscrews (2) for lower roller | 280 N·m (207 lbf·ft) | p. 423 |
| Tightening torque of grease nipple for crawler adjuster | 73.5 N·m (54.2 lbf·ft) | p. 423 |
