The Case CX31B and CX36B Compact Hydraulic Excavators are robust machines engineered for demanding work. These excavators feature efficient diesel engines with displacements of 1.52 L for the CX31B and 1.64 L for the CX36B, delivering net power outputs of 27.0 hp and 31.0 hp respectively. With hydrostatic transmissions and 2-speed travel, they offer precise control and maneuverability. Their compact dimensions, including transport lengths around 4030 mm and 4400 mm, and operating weights of approximately 3150 kg and 3600 kg, make them versatile for various job sites. These excavators are designed for reliability and performance in a wide range of applications. This manual provides comprehensive information for the Case CX31B and CX36B Compact Hydraulic Excavators, serving as both a Factory Repair Service Manual and an Operator Owner Manual. It covers essential maintenance procedures, including engine oil, hydraulic oil, and coolant capacities, along with service intervals for engine oil, hydraulic filters, and air filters. The manual also includes technical specifications and troubleshooting guidance. Its purpose is to assist owners, mechanics, and technicians in effectively maintaining, operating, and repairing these excavators to ensure optimal performance and longevity.