Pin clearances, pressure test values and circuit routing for the Kobelco SK045, SK045-2 and SK050 hydraulic excavators are settled in one place: the 511-page factory shop manual, OEM ID S5PY0002E. More than a third of this Kobelco SK045, SK050 shop manual PDF covers the hydraulic system, where schematics trace pilot piping from the pump through the control valve to the travel motor and slewing motor. Wiring diagrams map the electrical system. Travel, slewing and attachment test procedures tell you what a healthy machine should read, and the back half covers troubleshooting plus the engine's fuel, governor, cooling and lubrication systems. Check SK045 swing bracket frame pin clearance against 0.062 to 0.151 mm, and torque the rubber crawler track spring assembly to 11.7 ± 0.2 kgf·m (85 ft·lbs). A parked excavator can cost your crew a whole shift. Bookmarks put you on the right chapter in a couple of clicks, and the text layer finds any part name.
What's Inside This Kobelco SK045, SK045-2, SK050 Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 8-20 | Precautions Concerning Disassembly and Reassembly, Precautions Concerning Removing and Installing Hydraulic Equipment, Precautions Concerning Disconnecting and Connecting Pipes |
| Specifications | 21-34 | Name of Components, Working Ranges of Attachments, Lifting-Up Ability Diagram, Precautions to Be Exercised in the Use of the Crane, Specifications of Devices |
| Maintenance Standards | 35-41 | Lower System, Bucket, Attachment Pin and Bushing |
| Hydraulic Pressure and Test Procedures | 42-48 | Hydraulic Pressure Measurements, Travel Test Procedure, Slewing Test Procedure, Attachment Test Procedure, Another Test Procedure |
| Performance Inspection Standards | 49-52 | Performance Inspection Standard, SK045 Inspection, SK050 Inspection, SK045-2 Inspection |
| Systems Overview and External View | 53-56 | Systems Introduction, External View, Machine Components |
| Drive and Slewing Systems | 57-66 | Power Plant Assembly, Engine Mount Installation, Pump Connection, Slewing System Construction, Slewing Ring, Swivel Joint |
| Traveling and Upper Frame Systems | 67-86 | Traveling System Construction, Crawler Shoe Assembly, Upper Roller Assembly, Track Roller Assembly, Upper Frame Construction, Counterweight Removal |
| Control and Attachment Systems | 87-102 | Cable Control System, Engine Control, Relief-Valve-Integrated Triple Solenoid Valve, Attachment Construction, Bucket Removal, Dozer Assembly |
| Hydraulic System and Components | 103-287 | Hydraulic System General, Pilot Piping, Hydraulic Pump, Control Valve, Travel Motor Assembly, Slewing Motor Assembly, Swivel Joint |
| Troubleshooting and Engine Maintenance | 288-458 | Troubleshooting Procedures, Engine Proper, Lubrication System, Fuel System, Governor System, Cooling System |
| Engine Electrical System and Service Data | 459-511 | Electrical System |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Hydraulic Hose Union Nut Tightening Torque (1/8) | 1.0 +0.5/-0 Kgf-m (7.23 +3.6/-0 ft-lbs) | p. 18 |
| Hydraulic Hose Tapered Threads Tightening Torque (1/8) | 1.2 +0.12/-0 Kgf-m (8.68 +0.87/-0 ft-lbs) | p. 18 |
| Track spring assembly tightening torque (Rubber crawler) | 11.7 ± 0.2 kgf·m (85 ± 1.4 ft·lbs) | p. 71 |
| Track spring assembly grease cylinder tightening torque | 6 ± 1 kgf·m (43 ± 7 ft·lbs) | p. 71 |
| Pump Displacement | 27.5 (1.68) cm³ (cu-yd) x 2 | p. 134 |
| Two-speed switching pressure | 10 kgf/cm² (140 psi) | p. 224 |
| Parking brake release pressure | 20 kgf/cm² (284 psi) | p. 224 |
| Brake release pressure | min 25 (355) Allowable pressure 40 (569) kgf/cm² (psi) | p. 251 |
| Cap (8) tightening torque | 0.8kgf-m (5.8ft-lbs) | p. 270 |
| SK045 | ||
| Swing bracket frame pin clearance | 0.062 to 0.151 mm | p. 39 |
| Swing bushing rod pin clearance | 0.061 to 0.155 mm | p. 38 |
| SK045, SK045-2 | ||
| Rated speed | 2000 rpm | p. 134 |
Kobelco SK045, SK045-2, SK050 Common Problems This Manual Covers
Kobelco SK045 hydraulic pump makes a strange sound and nothing can be operated or power is lacking
Check the hydraulic oil level first; the tank holds 65L per page 34. Inspect the relief valve using the General Operating chart, then measure pump pressure against the 210 kgf/cm² (2990 psi) spec on page 134. If pressure stays low, check piston to shoe play against 0 to 0.1 mm on page 149.
Manual Section: General Operating TroubleshootingTravel motor will not change to 2nd travel speed and travel speed drops
Measure two-speed switching pressure at the travel motor and confirm it reaches 10 kgf/cm² (140 psi) as listed on page 224. If pressure is good, tear the motor down and check cylinder barrel and valve plate wear depth against 0.020 mm, plus shaft wear depth against 0.025 mm on page 249.
Manual Section: Travelling Troubleshooting p. 224Slewing is slow or lacks power and slewing structure will not hold in stop posture
Test brake release pressure at the slewing motor against the 25 kgf/cm² (355 psi) minimum on page 251. On the bench, apply 30 kgf/cm² (427 psi) to the brake release port and confirm the output shaft turns smoothly at 2 to 3 kgf-m (14 to 22 ft-lbs), per page 271. Measure balance plate wear against 0.03 mm on page 272.
Manual Section: Slewing Troubleshooting p. 251Boom cylinder lowers on its own and boom lowers once before rising
Run the attachment test procedure from the Hydraulic Pressure and Test Procedures section and compare results to the Performance Inspection Standards for your exact model: SK045, SK045-2 or SK050. Then follow the Boom Operating Troubleshooting chart on page 330 step by step for both symptoms, inspecting the control valve and boom cylinder in the order the chart lists before ordering parts.
Manual Section: Boom Operating Troubleshooting p. 330Engine overheats, shows poor performance and blows excessive black smoke at the exhaust
Check coolant level against the 6.6L system capacity on page 34. Test fan belt tension: it should deflect 10 to 12 mm under about 10 kg of push, per page 450. Replace the fuel filter element if it has run past the 500 hour interval on page 366, then work through the Engine Troubleshooting chart.
Manual Section: Engine Troubleshooting p. 450Hydraulic hose union nut or O ring pipe coupling weeping oil after reassembly
Clean the fitting and inspect the O ring before retightening. Torque a 3/8 hose union nut to 5.0 kgf-m (36.2 ft-lbs) per the table on page 18, and a 3/8 O ring pipe coupling to 5.5 kgf-m (39.8 ft-lbs) per page 19. Match every other fitting to its size row, staying inside the listed tolerance.
Manual Section: General p. 18Frequently Asked Questions
What are the recommended engine oil and oil filter service intervals for the Kobelco SK045, SK045-2, SK050?
Engine oil should be replaced after the first 50 hours of operation and then every 250 hours thereafter. The oil filter should also be replaced every 250 hours of operation. p. 361
What is the procedure for troubleshooting an engine that is hard to start?
First, check for a clogged air cleaner element, improper fuel, low cranking speed, or incorrect engine oil viscosity. If these are normal, inspect the glow system, fuel cut solenoid, fuel line flow, injection timing, valve clearance, injection nozzle, and compression pressure as outlined in the troubleshooting flow chart on page 371. p. 371
What is the valve clearance on the Kobelco SK045 Mitsubishi K4N engine?
Set both intake and exhaust valve clearance to 0.25 mm with the engine cold. p. 493
What is the cylinder head bolt torque on the Kobelco SK045 Mitsubishi K4N engine?
On the K4N engine, tighten the M14 main cylinder head bolts to 15 ~ 16 kg m and the sub bolts to 10 ~ 11 kg m, following the tightening sequence in the manual. p. 363
What is the standard compression pressure on the Kobelco SK045 Mitsubishi K4N engine?
The standard compression pressure for the K4N engine is 30 kg/cm², measured with the engine warm. p. 493
Is this Kobelco SK045 manual a PDF I download?
One searchable PDF covering 511 pages, delivered instantly. No disc, no shipping, no waiting on the post.
Is this Kobelco SK045 manual print-friendly?
Yes. Many buyers print one chapter at a time for their own shop and keep the rest on a tablet.
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