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First, you must state specifically to the truck manufacturer or trailer builder what loads are to be carried, and have some idea on load distribution, type of operations--such as a city operation with plenty of stop and go driving, terrain-- such as mountainous or level, climate, trade policy and expected annual mileage. In short, you must be specific as to the truck''s job application.The truck and the trailer builder design the braking system based on axle loading. Overloaded vehicles will not comply with government standards, nor will they be in proper balance. To ensure the brake lining is not overrated for the loads that the axles will carry, you should specify a specific gross axle weight rating (GAWR) for their axles.Secondly, you must ensure that the brakes on the powered vehicle are compatible with the brakes on the trailer. This applies to foundation brakes and friction materials, to air transmission times and to proper piping and valves. Trends in air brake systems

On some systems, a portion of the fuel is used for lubrication and cooling. This fuel bypasses the nozzle tip and returns to the fuel tank.Let''s take a quick look at the individual components that make up the fuel system.* Fuel Tanks -- All fuel tanks have a fuel intake fitting on top of the tank for filling and a drain or outlet fitting on the bottom. One or two additional fuel fittings may be found for returning unburned fuel to the tank.Fuel tanks are not trouble-free components. Metal tanks will eventually rust. The rust, combined with water from condensation, forms a mud inside the tank. Sludge forms in the tank when unburned carbon from injector nozzles is carried back to the tank with overflow fuel and combines with water. Thin flakes of hardened mud or sludge can easily plug the fuel outlet hole. This usually occurs when the tank is severely shaken.

4920 sprayerBuilding off the platform of the popular 4710 sprayer, John Deere now introduces the new 4920 Self-Propelled Sprayer for growers and custom applicators.With a new 120-foot spray boom, 300-hp engine, 1,200-gallon solution tank and 20-mph top spray speed, the 4920 sprayer brings exceptional performance to the field. The increased capacity and productivity of the new sprayer takes John Deere into all major post-application markets throughout North America.The triangular design of the new boom features round tubing and laser-cut support pieces for consistent fabrication and the strongest welds. The 120-foot boom will be the only option for the 2004 spraying season. Future boom sizes will include 90-and 100-foot models, but will not be available until 2005.