The maintainability analyses of a repairable mobile earth-moving equipment was undertaken. Using the analytical research approach, the Reliability, Availability and Maintainability models of the system were established through tedious computations to reveal the most pertinent candidate theoretical distributions that best modelled each quantity. Data was taken from a typical example of a Wheel loader Engine used in Crushed Rock Industries (NIG) Limited, located in Ebonyi State Nigeria. The results show that the equipment can retain up to 0.9 Reliability after 12o hours of operation. The results also show that the Engine system can be available for over 98% when operated under the stipulated design conditions, while about 17.38hours is the mean period required for the engine to be restored to its normal operating condition after a particular failure, when maintenance is carried out according to the designers prescription. The work further shows that mathematical modeling can be a good means of establishing actionable maintenance policies.