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• 04 DODGE RAM PRESSURE TEST SERIES

The spool valve is positioned in figure 4 to allow fluid flow from port 1 to port 2 while port 3 is blocked by land #1. The path of the pressurized fluid from port 1 is determined by the position of the spool valve. The raised portions of the cylinder are called lands while the indentations are called annular grooves.įigure 3 shows a simplified spool valve positioned in a bore with three ports. The surface of the spool valve is highly polished to form a sealing surface. A spool valve is basically a hollow cylinder with a number of rings machined into it (see Figure 2). Spool valves are used in a variety of hydraulic components, such as the valve body of an automatic transmission. The power steering pump supplies pressurized fluid for both the power steering gear and hydro-boost.įluid flow in and out of the hydro-boost is controlled by what is known as a spool valve. The hydro-boost is plumbed in line with the steering gear. A typical hydro-boost is shown in Figure 1. Proper diagnosis of hydro-boost related problems requires an understanding of how the system works.

04 DODGE RAM PRESSURE TEST SERIES

* Ford Super Duty series trucks equipped with Diesel and * Dodge Ram equipped with Cummins turbo diesel * 1996 and newer Cobras and all V8 Mustang Hydro-boost has been used on a variety of vehicles since its introduction and OEM applications presently include: The vehicle requires more assist than is available from a vacuum booster.There is limited space available for the power assist device.There is no vacuum source available, as in diesel engines, or the vacuum source available is too weak to adequately supply a vacuum booster.