The Komatsu WA300-1 and WA320-1 wheel loaders represent robust and reliable machinery designed for demanding operational environments. These models, part of the first generation, are engineered with powerful Komatsu engines, likely around 9.7 liters, delivering approximately 165 to 200 horsepower depending on the specific model. Featuring a 4-wheel drive system, articulated power steering, and heavy-duty planetary axles, they are built for efficiency and durability. The Z-bar linkage on the lift arms, combined with a torque converter Powershift transmission, ensures strong performance in material handling tasks. With operating weights around 17,500 kg for the WA300-1 and 19,500 kg for the WA320-1, these loaders are substantial pieces of equipment. This workshop service repair manual provides comprehensive technical information for the Komatsu WA300-1 and WA320-1 wheel loaders, covering serial numbers 10001 and up. The manual details essential maintenance procedures, including fluid capacities and replacement intervals for engine oil and transmission fluid, as well as troubleshooting guidance to address potential issues. It also includes technical specifications for the powertrain, steering, brake systems, and work equipment, along with electrical system details like the 24V DC system voltage. This resource is invaluable for owners, mechanics, and technicians seeking to maintain the optimal performance and longevity of their equipment.