Printed by Kobelco as document YCUK93S001OM-00, this 140-page Kobelco SK300 III, SK300LC III operator manual PDF is the factory book for both versions of this hydraulic excavator. Hydraulic and electric circuit diagrams sit in the reference chapter with working ranges, attachment combinations and component weights, so your pilot circuit and harness layout are on paper when a fault shows up. Maintenance takes the largest share of the book: pre-work checks, the service interval schedule and a lubrication and filter chart, followed by a troubleshooting table, transport preparation and hydraulic breaker precautions. Blow out the air cleaner element at under 100 psi (7 kg/cm²), and torque the hydraulic tank return filter cover to 80 ± 11 ft·lbs. Filter day should not stall on one missing number. Chapter bookmarks and a live text layer find it in seconds, and your excavator is swinging a full bucket again before lunch.
What's Inside This Kobelco SK300 III, SK300LC III Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety Operation | 4-31 | Safety Procedures (Recognize Safety Information, Understand Signal Words, Follow Safety Instructions) |
| Operating Equipment | 32-49 | Location of Components, Arrangement of Operating Controls, Operating Controls, Cab, I.T.C.S |
| Operation | 50-65 | Starting and Stopping the Engine, Operating Procedure, Method of Selecting the Mode Change Over Switch, Operating Methods for Improving Efficiency |
| Maintenance | 66-105 | Introduction, Pre-Work Check, Regular Maintenance (Items and Intervals, Lubrication and Filter Chart), Maintenance Under Special Conditions |
| Transportation | 106-109 | Preparing for Transportation |
| Reference Documents | 110-121 | Overall Specifications, Specifications and Performance, Types of Attachments and Combinations, Working Ranges of Attachments, Weight of Components, Hydraulic Circuit Diagram |
| Heater | 122-125 | Controls and Operation |
| Troubleshooting | 126-131 | Troubleshooting Table |
| Breaker & Optional Attachments | 132-137 | Hydraulic Breaker, Hydraulic Breaker Precautions |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Air cleaner element | 2446R353S3 (Outer), 2446R273S1 (Inner) | p. 71 |
| Manifold block filter tightening torque | 7~8 kgf-m (50.6~57.8 ft-lbs) | p. 85 |
| Hydraulic tank cover mounting (Return filter) torque | 11 ± 1.5 kgf·m (80 ± 11 ft·lbs) | p. 101 |
| Compressed air pressure for cleaning air cleaner element | less than 7 kg-cm2 (100 psi) | p. 88 |
| Travel motor cover mounting torque | 8.5 ± 0.5 kgf·m (61 ± 4 ft·lbs) | p. 101 |
| Travel motor mounting torque | 95 ± 9.5 kgf·m (686 ± 69 ft·lbs) | p. 101 |
| Battery mounting torque | 1.0 ± 0.2 kgf·m (7 ± 2 ft·lbs) | p. 101 |
| Pilot circuit select valve screw key size | 3mm | p. 133 |
| Pilot circuit select valve wrench size | 17mm | p. 133 |
| Hydraulic Tank Capacity | 282L | p. 73 |
| Engine Oil Pan Capacity | 34L | p. 73 |
| Swing Gear Sump Grease Capacity | 14kg | p. 73 |
Kobelco SK300 III, SK300LC III Common Problems This Manual Covers
Kobelco SK300 III hydraulic oil temperature rising too high during normal digging work
Check hydraulic oil level with the machine level, arm and bucket fully extended and the bucket resting on the ground, then fill KW46 to half the level gauge as page 20 directs. Clean a clogged oil cooler core wearing safety goggles, nozzle at least 500mm from the fins (page 90). Verify fan belt deflection of 10 to 15mm per page 89, and replace wrong-type oil with correct new oil.
Manual Section: Hydraulic System Troubleshooting p. 128All operating speeds slow and hydraulic power lost on every function at once
Check the hydraulic oil level gauge first and fill to the specified level with the arm and bucket extended and the bucket resting on the ground, as page 20 shows. Inspect the suction pipe hose clamp for air leaks; retighten it or replace the hose. If level and suction are good, the page 126 chart points to the hydraulic pump, pilot gear pump, or main and pilot relief valve adjustment: repair or replace.
Manual Section: General Troubleshooting p. 126Cylinder drifts down and will not hold position with the operating lever in neutral
Put the safety lock lever in the LOCKED position whenever the machine is at rest or being serviced, as page 38 requires. Reduce the load first, since an overload valve that is not operating lets the cylinder creep. If it still drifts at normal loads, the page 126 chart lists a scored cylinder seal, a damaged control or overload valve, or a damaged pilot valve: repair or replace.
Manual Section: General Troubleshooting p. 126Machine pulls to one side and will not travel in a straight line
Check track tension on both sides and adjust until they match; unequal tension is the first cause the page 128 chart lists. Clean packed track links and shoes, and back off tension if it is too tight, since both make travel rough (page 127). If tension is even and it still pulls, unbalanced main relief settings, a worn travel motor, or unbalanced pump regulators need repair or replacement.
Manual Section: Travel Troubleshooting p. 128Buzzer sounding with WATER TEMP display and temperature gauge climbing into the red zone
Stop working; page 42 says never operate with the temperature gauge in the red zone. Let the radiator cool before touching the cap, because hot coolant is under pressure (page 89). Check the reserve tank level sits between F and Low and refill, fasten a loose cap, look for coolant leaks, clean a clogged radiator core, and verify belt deflection at 10 to 15mm. Replace a faulty thermostat.
Manual Section: Hydraulic System Troubleshooting p. 128Starter turns over normally but the engine will not fire or start up
Check the fuel level and refuel with the engine stopped, as page 85 requires. Bleed air from the fuel line, replace a clogged fuel filter element, and clean or replace the air cleaner element. Check the pre-heat circuit for a blown fuse or damaged heater relay, and confirm the starting procedure on page 50 was followed before cranking again.
Manual Section: Engine Troubleshooting p. 130Frequently Asked Questions
How do I reset the oil change interval on the Kobelco SK300 III or SK300LC III?
To reset the 500-hour engine oil replacement interval, press and hold the oil change time reset switch. The multi-display will indicate '0' for 2 seconds, then 'Automatic carry' for 1 second, and finally 'Set' for 3 seconds, confirming the reset. p. 35
What are the replacement specifications for the hydraulic return filter on the Kobelco SK300 III, SK300LC III?
The hydraulic oil return filter element (Part No. 24046Z18) should be replaced after an initial 25 hours of operation, then at 100 hours for the second replacement, and every 200 hours thereafter. p. 136
What are the fuel filter element replacement specs for the Kobelco SK300 III, SK300LC III?
The fuel filter element (Part No. ME0S6670) should be replaced every 500 hours of operation. When replacing, hand-tighten the element only; never use a wrench. p. 73
What is the correct fan belt tension for the SK300 III?
The fan belt tension is correct when the deflection at the center of the belt is approximately 10 to 15 mm (0.39 to 0.59 inches) when pressed with your thumb. p. 89
What is the tightening torque for the travel motor mounting bolts on the Kobelco SK300 III, SK300LC III excavator?
The travel motor mounting bolts (size M24) must be tightened to a torque of 95 ± 9.5 kgf-m (686 ± 69 ft-lbs) using Locktite #262 equivalent. p. 101
How will I receive this Kobelco SK300 III Operator Manual?
All 140 pages arrive as one searchable PDF at checkout. Read it at the desk, then take the phone out to the machine.
Does this Kobelco SK300 III manual allow printing?
Yes. Print the sections you need to take out to the shop for your own use. Standard letter or A4 paper works.
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