Tearing down a Kobelco SK27SR-3 hydraulic excavator and returning it to factory tolerance is the job all 746 pages of publication S5PV0006ZE-01 are written around. Hydraulic circuit operation fills a large share of this Kobelco SK27SR-3 service manual PDF, with circuit diagrams tracing pump flow to the boom and arm cylinders, travel motors and swing motor, and wiring diagrams covering the electrical side. Disassembly is the biggest section (attachments, upper slewing structure, travel system), and the engine takes close to a third of the book, from inspection and adjustment through to troubleshooting. Set main relief on P1 and P2 to 23.0 MPa (3340 psi) at 26.4 L/min, and fit a 30µ return filter. Guess wrong on that setting and you could be paying for a pump and a second teardown. Bookmarks and a text layer make your search quick, and any section prints cleanly for the bench, where grease on the page costs nothing.
What's Inside This Kobelco SK27SR-3 Manual
| System | Pages | Key Topics |
|---|---|---|
| Specifications | 16-61 | Machine Dimensions, Specifications and Performance, Machine and Components Weight |
| Maintenance | 62-91 | Standard Maintenance Time Table |
| System | 92-247 | Hydraulic Circuit Operation, Hydraulic Circuit |
| Disassembling | 248-475 | General Disassembly and Assembly, Attachments, Upper Slewing Structure, Travel System |
| Troubleshooting | 476-509 | Trouble Diagnosis Hydraulic, Attachment Troubleshooting, Travel Operation Troubleshooting |
| Engine | 510-725 | Engine Specifications, Inspection and Adjustment, Troubleshooting Engine |
| Supporting Data | 726-746 | Installation Procedures for Optional Attachment, Hydraulic Circuit Diagram |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Intermediate Torque (Net) | 79.0~86.0 N·m (58.3~63.4 lbf·ft) | p. 20 |
| Return Filter | 30µ | p. 22 |
| Metric Coarse Thread Standard Tightening Torque (M36, 10.9T, No lubrication) | 4010 ± 402 N·m | p. 53 |
| Relief valve set pressure | 3.5 MPa (508 psi) | p. 97 |
| Setting pressure at main relief valve P1, P2, P3 | 23.0 +0.5 MPa (3340 +72 psi) at 26.4 L/min (7.0 gal/min) (MR1, MR2) | p. 176 |
| Engine oil filter tightening torque | 20~24 N·m (2.0~2.4 kgf·m) | p. 724 |
| Fuel filter tightening torque | 20~24 N·m (2.0~2.4 kgf·m) | p. 724 |
| Engine Oil Capacity (3TNV82A) | 5.5L | p. 551 |
| Engine Oil Capacity (3TNV84/88) | 6.7L | p. 530 |
| Engine Oil Capacity (4TNV94L/98) | 10.2L | p. 536 |
| Engine Oil Capacity (4TNV106) | 14.0L | p. 539 |
| Main Relief Valve Pressure (P1, P2) | 23.0 ± 0.6 MPa | p. 76 |
Kobelco SK27SR-3 Common Problems This Manual Covers
Kobelco SK27SR-3 boom and bucket functions slow and weak under a full digging load
Measure main relief pressure at P1 and P2 before you touch anything else; page 76 gives 23.0 ± 0.6 MPa (3340 ± 87 psi). Set main relief MR1 and MR2 to 23.0 MPa (3340 psi) at 26.4 L/min following page 176. If pressure holds, work through the pump and engine load checks in the hydraulic troubleshooting starting on page 476.
Manual Section: Hydraulic System Troubleshooting p. 476Upper slewing structure swings slow or weak to the left and right
Check slew relief pressure on LH and RH against 18.5 ± 1.0 MPa (2680 ± 145 psi), listed on page 76. Compare it with main relief at P1 and P2 to confirm the fault is in slewing only. Then follow the slewing checks in the hydraulic troubleshooting on page 476 before you pull any Upper Slewing Structure components.
Manual Section: Hydraulic System Troubleshooting p. 476Machine travel slow or weak on the left side when tracking forward
Measure P1 main relief pressure first. Page 76 puts boom, bucket and Travel (LH) on that circuit at 23.0 ± 0.6 MPa. If boom and bucket feel strong but left travel stays weak, work the travel checks in the hydraulic troubleshooting on page 476. After that, go to the Travel System teardown in the Disassembling section.
Manual Section: Hydraulic System Troubleshooting p. 476Attachment cylinder drifts down on its own with the control lever in neutral
Check the control valve first using the Control Valve Troubleshooting steps for natural drop of cylinder. Verify overload relief valve settings on the B1, A3, B3, A4, B4 and B10 ports against 25.5 +0.5 MPa at 5 L/min following page 176. If the cylinder comes apart, measure rod to bushing clearance against 0.25 mm on page 276.
Manual Section: Control Valve TroubleshootingSwivel joint leaking oil externally or internally, with a sticking shaft or loose flange
Inspect the swivel joint for external oil at the flange and check the flange for looseness before you do anything else. The swivel joint troubleshooting table on page 412 lists External Oil Leakage, Internal Oil Leakage, Shaft Sticks and Flange Looseness with the cause and corrective action for each. If the leak is internal or the shaft sticks, remove the swivel joint and take it apart following the swivel joint procedure in the Disassembling section.
Manual Section: Swivel Joint Troubleshooting p. 412Starting motor turns slowly or engine fails to start at the key
Work through the starting motor troubleshooting chart on page 684. It starts at Engine does not start and asks: Does the starting motor revolve? If it turns but slowly, the chart branches to slow revolution and checks battery charge and terminal connections, then engine oil viscosity. If the engine cranks at normal speed but will not start, the chart sends you to inspect the ignition and fuel systems.
Manual Section: Starting Motor Troubleshooting p. 684Frequently Asked Questions
What is the torque specification for the Kobelco SK27SR-3 lower roller mounting capscrews?
The tightening torque for the lower roller mounting capscrews (2) is 208 N·m (153 lbf·ft). p. 428
What are the replacement specifications for rubber tracks on the SK27SR-3?
The rubber crawler should be replaced if the contact surface of the rubber crawler and lower roller has half of the cores visible from the outside. Additionally, the height (H) should be replaced if it reaches 54 mm (2.1 in) or less, and the lug projection (h) should be replaced if it reaches 0 mm (0 in). p. 421
What is the cylinder head bolt tightening torque for the 3TNV82A engine on the Kobelco SK27SR-3?
For the 3TNV82A engine, the cylinder head bolts should be tightened in two steps. The first step is 30.0–34.0 N·m (3.1–3.5 kgf·m) and the second step is 61.7–65.7 N·m (6.3–6.7 kgf·m). p. 601
What is the standard valve clearance for the 3TNV82A engine on the Kobelco SK27SR-3?
The standard valve clearance for the 3TNV82A engine is 0.15–0.25 mm. p. 569
How often should the engine oil be replaced on the SK27SR-3 engine?
The engine oil should be replaced every 250 hours of operation after the initial 50-hour break-in period. p. 559
What exactly do I receive with this Kobelco SK27SR-3 Service Manual?
A 746-page Service Manual in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Can I print this Kobelco SK27SR-3 manual?
Yes, printing is unrestricted: a single page, a chapter, or the lot, on letter or A4.
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