The Caterpillar 966 Hydraulic Test Adjust Manual is a service book designed for use with heavy equipment such as wheel loaders and tractors. Specifically compatible with Caterpillar models 966, 966C, 966B, and 966D, this manual provides essential information for proper maintenance and operation of the equipment. With a model year of issues 11/79, this manual ensures that users have access to the most current and accurate information for optimal performance and longevity of their Caterpillar machines.