Keeping a WA300-1 wheel loader on schedule from break-in onward is the single job the 135 pages of this Komatsu WA300-1 operator manual PDF (OEM ID SEAMO4 180105) were written to handle. Instruments and controls take up a large share of the book, from the monitor panel and directional lever to boom kickout and bucket positioner adjustment, and the maintenance table sets every interval from the walk-around check to the 2000-hour service. A troubleshooting guide sorts faults by electrical, engine, transmission, axle, disc brake and hydraulic system, and the closing section lists the right fuel, coolant and lubricant for every compartment. When you drain the transmission, plan on a 31 L refill against the 35 L case capacity, and change the filter element at the first 250 hours. Alone on a site with nobody to ask, you work from the page. The PDF is bookmarked and text-searchable, and it prints cleanly, so the service pages can go to your bench and pick up grease.
What's Inside This Komatsu WA300-1 Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Breaking in Your New Machine | 3 | Engine Idle, Fuel Filter Cartridge, Transmission Oil Filter Element, Engine Valve Clearance, Oil Filter Elements, Service Meter |
| Safety Hints | 5-11 | Control Devices, Gauges, Warning Devices, Caution Plates, Fire Extinguishers, First Aid Boxes |
| General Locations and Specifications | 12 | Lift Arm, Lift Cylinder, Dump Cylinder, Tilt Lever, Bucket, Engine Model |
| Instruments and Controls | 13-40 | Monitor Panel, Starting Switch, Directional Lever, Speed Control Lever, Accelerator Pedal, Brake Pedals |
| Operating the Air Conditioner | 41-43 | Fan Switch, Air Conditioner Switch, Air Selector Lever, Temperature Control Lever, Control Panel |
| Operating the Car Heater | 44-45 | Fan Switch, Temperature Control Lever, Air Selector Lever, Control Panel |
| Check Before Starting | 46-50 | Walk-Around Check, Monitor Panel, Coolant, Engine Oil Pan, Fuel Tank, Battery Electrolyte |
| Operating Your Machine | 51-60 | Directional Lever, Parking Brake Lever, Work Equipment Control Levers, Accelerator Pedal, Speed Control Lever, Steering Wheel |
| Adjustment of Work Equipment | 61-62 | Boom Kickout, Proximity Switch, Bucket Positioner, Bucket Level Indicator |
| Handling the Tires | 63-65 | Tire Pressure, Inflation Pressure, Deflection Ratio, Tire Defects |
| Towing | 66 | Drive Shafts, Steering Cylinder, Steering Linkage |
| Transportation | 67 | |
| Handling of Battery | 68-70 | Electrolyte, Battery Cables, Booster Cables, Starting Motor, Alternator |
| Cold Weather Operation | 71-74 | Lubrication Oil, Antifreeze, Fuel, Preheater Switch, Battery |
| Using Accumulators | 75 | Nitrogen, Air Bleeder Valve, Gas Pressure |
| Periodic Maintenance | 76-80 | Lubrication, Oil, Filters, Safety Parts, Air Circuits |
| Maintenance Table | 83-85 | Check Before Starting, Every 50 Hours Service, Every 250 Hours Service, Every 1000 Hours Service, Every 2000 Hours Service |
| Oil Filler and Level Gauge Positions | 86-123 | Hydraulic Tank, Transmission Case, Front Axle, Engine Oil Pan, Brake Oil Tank, Fuel Tank |
| Trouble Shooting Guide | 124-127 | Electrical System, Engine, Transmission, Axle, Disc Brake, Hydraulic System |
| Fuel, Coolant and Lubricants | 132-135 | Engine Oil, Transmission Case Oil, Hydraulic System Oil, Axle Oil, Diesel Fuel, Antifreeze |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Replacement of transmission oil filter element | At the first 250 hours of operation | p. 3 |
| Transmission case oil capacity | 35 L | p. 132 |
| Transmission oil refill capacity | 31 L | p. 98 |
| Transmission case oil refill capacity | 31 L | p. 132 |
| Operating weight | 12180 kg | p. 12 |
| Flywheel horsepower | 141 HP | p. 12 |
| Fuel capacity | 200 L | p. 48 |
| Coolant capacity | 38 L | p. 71 |
| Engine oil refill capacity | 19 L | p. 90 |
| Hydraulic system refill capacity | 60 L | p. 104 |
| Axle oil refill capacity (each axle) | 24 L | p. 106 |
Komatsu WA300-1 Common Problems This Manual Covers
Komatsu WA300-1 engine running but loader will not move, or moves slowly and lacks power at full throttle
Release the parking brake and set the directional lever fully into position before chasing anything else. Check the transmission case oil and add oil to the specified level, per the chart on page 126. The refill capacity is 31 L on page 132. If the loader still crawls at full throttle, take out the transmission strainer and clean it.
Manual Section: Transmission Troubleshooting p. 126Transmission oil overheating during long shifts of pushing the bucket into the pile
Let the machine cool first, because page 78 warns that hot oil can spurt out right after operation. Check the transmission case oil and add oil to the specified level, or drain oil if it is overfilled, following page 126. Use a suitable gear speed for the work and spend less time at torque converter stall speed. If it still runs hot, check the engine.
Manual Section: Transmission Troubleshooting p. 126Disc brakes dragging or staying applied after the operator lifts off the brake pedal
Adjust the brake pedal play first. Then clean the exhaust hole of the treadle valve and the breather on the power cluster, as listed on page 126. If the brakes still drag, check and repair the slack adjuster. Tell operators to keep their feet off the pedals between stops, because page 30 says not to use the brake pedals as footrests.
Manual Section: Disc Brake Troubleshooting p. 126Lift arms raising the bucket slowly and without power, with many bubbles in the hydraulic oil
Check the hydraulic tank level, add oil, and replace the filter in the hydraulic tank following page 127. If the oil is full of bubbles, replace it with the specified oil from page 132 and bleed air from the oil line. The hydraulic system refill capacity is 60 L on page 104. Topping up oil is also the chart's fix when the cylinders vibrate during operation.
Manual Section: Hydraulic System Troubleshooting p. 127Steam blowing from the radiator pressure valve while the radiator coolant level monitor flashes
Let the engine cool before you open the radiator, because page 78 warns that boiling water can spurt out right after operation. Add coolant and check for leaks, adjust fan belt tension, and clean or repair the radiator fins following page 125. If it keeps boiling, tighten the radiator cap or replace its gasket, wash out the cooling system, and replace the thermostat.
Manual Section: Engine Troubleshooting p. 125Engine oil pressure monitor flashing when engine speed is raised after warm-up
Check the oil level in the engine oil pan and add oil to the specified level. The refill capacity is 19 L per page 90. Replace the oil element and check the pipes and joints for oil leaks, following the chart on page 125. If the level and filter are good and the lamp still flashes, replace the monitor.
Manual Section: Engine Troubleshooting p. 125Frequently Asked Questions
How do I bleed the air from the hydraulic system on a Komatsu WA300-1?
To bleed the air from hydraulic cylinders or piping, run the engine at low idling. Operate each hydraulic cylinder 4 to 5 times, stopping 100 mm from the stroke end, then operate each cylinder 3 to 4 times to the stroke end. p. 82
What is the procedure for replacing the transmission oil filter element?
Remove the drain plug at the bottom of the filter case to drain the oil, then hold the case and loosen the center bolt to remove the case. Replace the element, clean the inside of the case, and reassemble using new O-rings and gasket, ensuring the center bolt is tightened to 15.5 ± 1.5 kgm. p. 97
What is the correct engine oil refill capacity for the WA300-1?
The engine oil pan has a specified capacity of 24 liters, with a refill capacity of 19 liters. p. 132
How do I adjust the fan belt tension?
The belt tension should deflect by about 10 mm when pressed with approximately 6 kg of force at a point midway between the alternator and fan pulleys. To adjust, loosen the bolt and nut on the alternator and shift it slightly. p. 91
What is the tightening torque for the wheel hub bolts on a Komatsu WA300-1 wheel loader?
The wheel hub bolts must be tightened to a torque of 94.5 ± 10.5 kgm. Always rotate in the direction of tightening when checking for loose bolts. p. 95
Do I get instant access to this Komatsu WA300-1 Operator Manual?
You download the Operator Manual yourself: 135 pages, searchable PDF, available immediately. Keep a copy on every device you use.
Is this Komatsu WA300-1 Operator Manual printable?
Yes. Print individual pages or full chapters for your own shop use, on letter or A4 paper.
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