Main body, hydraulics, hydraulic circuits, electric circuits and maintenance each get their own section across the 230 pages of this Sumitomo SH125X-3, SH135X-3 service manual PDF (OEM ID 125-1-00-00-12), written for both hydraulic excavators. Hydraulic circuit drawings with port locations fill a large share of the book, so you can trace oil from the piston pumps through the control valve and rotating joint to the travel motors, and the electric circuit diagrams come with operational descriptions. Exploded views break out the travel unit, swing unit, recoil spring and rollers, and the maintenance section closes on measuring and adjusting pressures. Set main relief at 34.3 MPa for boom, arm, bucket and travel and at 28.0 MPa for swing, with the piston pumps rated at 2 x 117 L/min. A misread relief setting idles a crew for a shift. Bookmarked and text-searchable, the PDF is yours once bought, kept for the life of your machine.
What's Inside This Manual
| System | Pages | Key Topics |
|---|
| Main Body Section | 1-56 | Specifications, Major Equipment Specifications |
| Hydraulics Section | 57-116 | Hydraulic Pump Operational Description, Travel Unit Travel Motor |
| Hydraulic Circuits Section | 117-158 | Port Locations |
| Electric Circuits Section | 159-210 | Operational Description, Electric Circuit Diagrams |
| Maintenance Section | 211-230 | Measuring Adjusting Pressure |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| SH125X-3 |
| Hydraulic pump discharge (Piston pump) | 2 x 117 L/min | p. 6 |
| Hydraulic pump discharge (Gear pump for pilot use) | 21.5 L/min | p. 6 |
| Operating Weight (SH125X-3) | 12,400 kg | p. 5 |
| All Models |
| Piston pump discharge | 2 x 117 L/min | p. 15 |
| Travel motor working pressure | 34.3 MPa | p. 39 |
| Travel motor working flow | 117 L/min | p. 39 |
| Swing unit working pressure | 28.0 MPa | p. 41 |
| Swing unit relief set pressure | 28.0 ± 0.4 MPa at 84 L/min | p. 41 |
| Engine Output | 64 kw / 2,100 rpm | p. 5 |
| Main Relief Pressure | 34.3 MPa | p. 6 |
| SH125X-3 with blade |
| Operating Weight (SH125X-3 with blade) | 13,250 kg | p. 14 |
| SH135X-3 with blade |
| Operating Weight (SH135X-3 with blade) | 13,850 kg | p. 23 |
