A weeping arm cylinder, a sluggish travel motor or a hard-starting engine all point to the same book: the Kobelco SK55SRX service manual PDF, 979 pages of factory data for this crawler excavator, published under OEM ID S5PS0001E01. Hydraulic schematics trace oil from the pumps to the boom, arm, bucket, swing and travel circuits, and wiring diagrams lay out the electrical harnesses that the troubleshooting charts send you back to. Disassembly is the largest section. It covers taking apart and reassembling the attachments, the upper slewing structure and the travel system. Close to two-fifths of the book covers the engine: EGR, injection timing, cooling, lubrication, turbocharger and starter motor. Hold bucket cylinder head-side clearance to 0.5 to 0.9 mm, and torque an unlubricated M6 4.8T bolt to 4.4 ± 0.5 N·m. Chasing a hydraulic fault blind can eat a full day. Bookmarks and keyword search take you to the right page quickly, so the machine is digging again sooner.
What's Inside This Kobelco SK55SRX Manual
| System | Pages | Key Topics |
|---|---|---|
| Specifications Section | 8-57 | Outline, Specifications, Attachment Dimensions |
| Maintenance Section | 58-105 | Tools, Standard Maintenance Timetable, Maintenance Standard and Test Procedure |
| System Section | 106-279 | Hydraulic System, Electrical System, Components System, Air-Conditioner System |
| Disassembly Section | 280-551 | General Disassembly and Assembly, Attachments, Upper Slewing Structure, Travel System |
| Troubleshooting | 552-585 | Troubleshooting Hydraulic System, Troubleshooting Electrical System, Troubleshooting Engine |
| Engine Introduction and Specifications | 586-647 | Engine Models, Engine General Specifications, Principal Engine Specifications, Engine Speed Specifications |
| Engine Service Standards | 648-719 | Periodic Maintenance Schedule, Periodic Maintenance Procedures, Engine Oil and Filter Replacement |
| Engine Disassembly and Assembly | 720-784 | Cylinder Head Specifications, 2-Valve Cylinder Head, 4-Valve Cylinder Head, Rocker Arm Assembly, Crankshaft and Camshaft Components |
| EGR System | 785-827 | EGR System Components, EGR Valve Inspection, EGR Cooler Cleaning, Crankcase Breather System |
| Fuel System | 828-871 | Fuel Injection Pump, Fuel Injectors, Fuel System Diagram, Fuel Injection Timing Adjustment |
| Cooling System | 872-885 | Cooling System Diagram, Engine Coolant Pump, Thermostat, Radiator Cap |
| Lubrication System | 886-905 | Lubrication System Diagram, Trochoid Oil Pump, Oil Pump Service Information, Oil Pressure Check |
| Turbocharger and Starter Motor | 906-979 | Turbocharger Components, Turbocharger Troubleshooting, Starter Motor Specifications, Starter Motor Troubleshooting |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Metric Coarse Thread Standard Tightening Torque Values (M6, 4.8T, No lubrication) | 4.4 ± 0.5 N·m | p. 60 |
| Metric Coarse Thread Standard Tightening Torque Values (M6, 4.8T, Oil lubrication) | 3.7 ± 0.4 N·m | p. 60 |
| Starting Motor | 12 V x 2.3 kW | p. 23 |
| Harness end treatment length | 30 ± 10 mm | p. 140 |
| Clearance X for Bucket cylinder (Head side) (E-E) | 0.5~0.9mm (0.020~0.035") | p. 46 |
| Clearance X for Arm cylinder (Rod side) (G-G) | 0.5~0.9mm (0.020~0.035") | p. 46 |
| Main relief valve (MRV1, MRV2) pressure adjustment (one full turn) | 17.7 MPa (2567 psi) | p. 94 |
| Main relief valve (MRV3), Overload relief valve pressure adjustment (one full turn) | 28.4 MPa (4118 psi) | p. 94 |
| Engine Output Rating | 29.1/2,400 kW/min-1 {PS/rpm} | p. 23 |
| Engine Oil Volume (Max/Effective) | 7.4 / 4.0 liter | p. 32 |
| Cooling Water Capacity (Max/Engine) | 6.0 / 2.7 liter | p. 32 |
| Dozer Stroke (above/below) | 497 / 373 mm | p. 23 |
Kobelco SK55SRX Common Problems This Manual Covers
Kobelco SK55SRX boom, arm and bucket attachment speed slow and attachment operating power low
Check main relief pressure on P1 and P2 against 23.0 ± 0.5 MPa, listed on page 88. If it reads low, adjust MRV1 or MRV2 following the procedure on page 94, then torque nut (2) to 30 N·m (22 lb-ft). Work through the attachment charts starting on page 552 before you condemn the pump.
Manual Section: Hydraulic System Troubleshooting (Attachment) p. 552Travel speed slow, travel power low, or machine shows travel deviation to one side
Check P1 main relief pressure, which covers travel LH, against 23.0 ± 0.5 MPa on page 88. Then test the GM motor: per page 551, drive pressure should be 1.57 MPa (228 psi) or lower at 10 rpm, and drain amount should be 0.5 L/min or less. Follow the travel charts from page 552 to isolate the side.
Manual Section: Hydraulic System Troubleshooting (Travel) p. 552Slewing speed slow, slewing power low, or slewing operation malfunction on the upper structure
Check slew relief valve pressure against 20.1 ± 0.3 MPa, listed on page 88. Confirm it matches the 20.1 MPa (2910 psi) setting on the hydraulic schematic at page 114. If the pressure is correct, work through the slewing operational failure charts starting on page 552 to find the fault before tearing into the upper slewing structure.
Manual Section: Hydraulic System Troubleshooting (Slewing) p. 552Starter does not rotate, or starter rotates but engine is hard to start
Check the engine start failure circuit following the electrical troubleshooting on page 564, and trace the wires on the wiring diagram. Confirm the unit is the 12 V x 2.3 kW starting motor listed on page 23. Then test it using the starter motor troubleshooting section that begins on page 906.
Manual Section: Electrical System Troubleshooting p. 564Engine overheats, knocks at high temperature, and engine output is not enough
Check coolant level first. Per page 32, the system holds 6.0 liters max, with 2.7 liters in the engine. Inspect the thermostat, radiator cap and engine coolant pump following the Cooling System section on page 872. If the cooling system checks out, test engine output against the 29.1 kW at 2,400 rpm rating on page 23.
Manual Section: Cooling System p. 872Frequently Asked Questions
How do you release hydraulic pressure on a Kobelco SK55SRX?
To release hydraulic pressure, you must open the return side cover and take out the filter before disconnecting any pipes. This ensures the system is depressurized to prevent oil spillage and injury. p. 11
What is the standard tightening torque for an M10 bolt (7T) with oil lubrication on the Kobelco SK55SRX?
For an M10 bolt (7T) with oil lubrication, the standard tightening torque is 39.2 ± 3.9 N·m (28.9 ± 2.9 lbf·ft). p. 60
What is the engine oil volume of the Kobelco SK55SRX 4TNV88 engine?
The SK55SRX engine specifications list the engine oil volume as 7.4 liters (1.96 gal) maximum and 4.0 liters (1.06 gal) effective for the Yanmar 4TNV88 engine. p. 32
What is the valve clearance on the Kobelco SK55SRX 4TNV88 engine?
Intake and exhaust valve clearance on the SK55SRX's Yanmar 4TNV88 engine is 0.2 mm (0.008 in), set with the engine cold. p. 32
What is the compression pressure of the Kobelco SK55SRX 4TNV88 engine?
The SK55SRX engine specifications give a compression pressure of 3.4 ± 0.1 MPa (500 ± 14 psi) at 250 rpm for the Yanmar 4TNV88 engine. p. 32
Is this Kobelco SK55SRX Service Manual a digital download?
All 979 pages arrive as one searchable PDF at checkout. Read it at the desk, then take the phone out to the machine.
Am I free to print this Kobelco SK55SRX Service Manual?
Yes. It prints from any PDF reader, so run off the pages you need for your own repair work.
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