Inefficiencies in an hydraulic system become the heat problem of the system. The easy way to solve the heat problem is to add a heat transfer unit into the system. This cools the oil after the fact. The localized heat at its sources continues to cause breakdown of the oil and excessive wear on parts, seals, etc.In most mobile systems the heat can be reduced to a livable level without the use of coolers. Where a cooler must be used the cooler can be smaller, or the oil cooler, by making the system as efficient as practical.The use of electronic instrumentation can point up the areas contributing to the Btu buildup in the system and show the results of corrective measures.Instrumentation can also assist in reducing the vehicle horsepower requirements by the proper use of the available power.