The development trend in construction machinery has been to produce equipment having a high level of reliability. The dollar loss that occurs when a major piece of equipment breaks down on the job is sufficiently great to justify the cost of providing reliable operation. In the development of the North the need for increased reliability is greater than ever. In extreme low temperature conditions as found on the NORTH SLOPE operation in Alaska, the harshness of the environment places additional stress both on the equipment and the operators.The development of winterization kits for construction and heavy engineering equipment to date has been slow, probably because of a comparatively small market and because the work could be postponed or accomplished by protecting the equipment and operator by temporary means to meet the purpose. The results have not been economical or as efficient as desired but efficient enough to be acceptable.In the past, winterization kits have been developed to meet either a military tactical or nontactical requirement. The difference between a military or a civilian requirement as far as construction machinery is concerned is not very great. The primary difference is that the civilian requirement is based almost entirely on the economic considerations.This paper deals with the development of winterization kits utilizing military experience and developing and testing winterization kits to meet a civilian or nonmilitary requirement using readily available off-the-shelf material and components.