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 Sumitomo SH125X-3, SH135X-3 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 |
Sumitomo SH125X-3, SH135X-3 Common Problems This Manual Covers
Sumitomo SH125X-3/SH135X-3 swing motor pressure does not rise and swing does not reach specified revolution
Measure swing relief pressure and compare the reading against 28.0 ± 0.4 MPa at 84 L/min listed on page 41. If pressure will not rise or swing speed stays short of specified revolution, work through the Swing Unit Problems and Remedies chart for motor slip and oil leaks before you pull the swing motor.
Manual Section: Swing Unit Problems and Remedies p. 41Swing motor slips when parked, swing mechanical brake shows insufficient braking torque
Check the swing brake solenoid valve operation first, then verify the swing motor mechanical brake status per the Swing Parking Circuit troubleshooting. Measure brake release pressure against min. 2.3 MPa (max. 4.9 MPa) and confirm brake torque of 284.7 N·m or over, both listed on page 41.
Manual Section: Swing Parking Circuit Troubleshooting p. 41Boom, arm and bucket main relief pressure reads below specification during pressure check
Measure main relief pressure following the procedure on page 215 and compare the reading against 34.3 MPa for boom, arm, bucket and travel on page 15. Check the boom, arm and bucket overload relief settings against 37.8 MPa. If relief checks out, compare pump output against 117 x 2 L/min at 2150 rpm on page 47.
Manual Section: Measuring and Adjusting Pressure p. 215Pilot control circuit relief pressure reads below the pilot pressure setting during pressure check
Measure pilot relief pressure following the Measuring and Adjusting Pressure procedure and compare against 3.9 MPa (40 kgf/cm²) on page 222. Turn the adjustment screw in small steps, since one turn moves pressure 1.56 MPa (16 kgf/cm²). Recheck the gauge after every adjustment before returning the machine to work.
Manual Section: Measuring and Adjusting Pressure p. 222Sumitomo SH125X-3/SH135X-3 engine restarts in limp-home mode after a governor servo error
The limp-home switch on this model is wired to GND (ON) constantly, so after a governor servo error the engine automatically starts in limp-home mode on restart, even if the key switch was not turned off. In limp-home mode rack position is regulated only from engine rpm read by the TDC and backup rotational sensors, not from actual rack position. Check the error code in Engine Control Troubleshooting and inspect the governor servo circuit on the Electric Circuits Section diagrams (p. 167) before replacing parts.
Manual Section: Engine Control Troubleshooting (Faulty electrical system) p. 167Frequently Asked Questions
How do I reset the fault codes on the Sumitomo SH125X-3?
To clear the fault diagnosis memory, the engine controller must receive the clear memory signal (IN2) by being set to ON (=0 V) for 1 second or longer, followed by an OFF signal for 0.5 seconds or longer. p. 187
What is the error code list for the Sumitomo SH125X-3?
The error codes for the SH125X-3 include: 32 (Rack sensor error), 31 (Governor internal circuit error/Linear servo motor error), 41 (TDC sensor error), 42 (Backup sensor error), 21 (Throttle sensor error), 15 (Coolant temperature sensor error), and 25 (Q-adjusting resistance error). p. 187
What is the replacement specification for the travel motor on the SH125X-3?
The travel unit (with parking brake) uses Sumitomo Part No. KMA1321, manufactured by Teijin Seiki Co., Ltd. It is a variable displacement piston motor with a working pressure of 34.3 MPa and a dry weight of 144.0 kg. p. 39
What is the main relief pressure setting for the SH125X-3?
The main relief pressure setting for the SH125X-3 is 34.3 MPa (350 kgf/cm²) at 60 L/min. p. 215
What is the capacity of the hydraulic oil tank for the SH125X-3?
The capacity of the hydraulic oil tank for the SH125X-3 is 81 L. p. 9
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