German Wikipedia says this was done to avoid overheating: "Since September 1975 the further developed Charkowtschanka-2 was built. One of the most important di

German Wikipedia says this was done to avoid overheating: "Since September 1975 the further developed Charkowtschanka-2 was built. One of the most important differences was the external cabin, which also facilitated access to the engine and transmission, which were mounted under a classic engine hood and avoided overheating problems."