Besides the engine, the biggest difference between the 430s and 530s (Ag models) is the tin. The hood tin is taller on a 530 (and 630) which requires 15" grill screens. The fuel tank is under the hood on a 430, while the 530 and 630's fuel tank is part of the tin work.... In other words the larger fuel tank is exposed.
Another difference is the fenders. 430s always had clam shell fenders and small footplates that were not connected to the fenders. The early 530s had full fenders that connected to the footplates similar to the 300s and x00B series tractors before them. The very late 530s and 570s were fitted with clam shell fenders similar to the 430s..
Another major difference was instrumentation. The 430s had a tach, temp gauge and two indicator lights (Gen and Oil pressure). Early 530s had cluster gauges that included Fuel level, Water Temp, Ammeter, Oil Pressure, Tach and Speedometer gauges. Later models (after serial number 8262800) had individual gauges.
The lower tin on the 430s resulted in a different placement of the hydrostatic steering valves on the later tractors. The 430's valve was placed in front of the radiator behind the grill screens, while the 530's was placed under the fuel tank aft of the engine. Of course this difference in valve placement resulted in different plumbing from the pump to the valve and then on to the steering cylinders. The early 530s had several different power steering setups before the hydrostatic steering system was introduced with serial number 8262800. The PS options for the early 430s were limited. The Char-Lynn system used on the 300B/400B was available, and there was a system available for the solid front axle utility. That being said power steering on the "economy model" 430 was not common.
Other than the items mentioned above, the drive train and chassis between the two models were identical, or nearly so....but there were a number of changes made from early to late models. - Joe
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