Aug 15, 2010 I started with the Hydratech Hydroboost kit which came complete with everything needed for the basic installation. After reading many many threads about this install, I discovered a modification which runs the low pressure return line direct to the Power Steering Pump.
Proper diagnosis of hydro-boost related problems requires an understanding of how the system works. A typical hydro-boost is shown in Figure 1. The hydro-boost is plumbed in line with the steering gear. The power steering pump supplies pressurized fluid for both the power steering gear and hydro-boost. Spool Valve Fluid flow in and out of the hydro-boost is controlled by what is known as a spool valve. Spool valves are used in a variety of hydraulic components, such as the valve body of an automatic transmission. A spool valve is basically a hollow cylinder with a number of rings machined into it (see Figure 2).
Dhairyam movie mp3 songs download. The surface of the spool valve is highly polished to form a sealing surface. The raised portions of the cylinder are called lands while the indentations are called annular grooves. Figure 3 shows a simplified spool valve positioned in a bore with three ports. The path of the pressurized fluid from port 1 is determined by the position of the spool valve. 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. Figure 4 shows the spool valve moved to the left which changes the fluid flow.
The fluid flow is now from port 1 to port 3 with port 2 being blocked by land #2. The spool valve in a hydro-boost works in a similar fashion. Hydro-boost Construction Figure 5 shows a cutaway of a hydro-boost with all the major components labeled. These include the housing, power chamber, input rod assembly, a lever assembly, a power piston, spool valve assembly and an output rod. The housing is fitted with three ports as identified in Figure 6.
The spool valve fits into a precisely machined bore that is part of the hydro-boost housing as shown in Figure 7. The fit between the spool valve and the bore is such that it creates a seal while at the same time allowing enough fluid between the lands and bore to provide lubrication. Al brooks trading price action reversals pdf merger. The spool valve’s position is determined by the lever assembly which is connected to the input rod. Pedal Unapplied When the brakes are unapplied the spool valve is positioned as shown in Figure 8. In this position the pressurized fluid from the power steering pump is allowed to flow to the steering gear, but not into the power chamber.
The spool valve vents the power chamber to the return line of the power steering pump reservoir. Pedal Applied Once the brake is applied, the input rod moves forward (left) to the power piston assembly. The piston return spring is preventing the power piston and pin “A” from moving forward. This lack of movement causes the input rod to force the travel limiter valve assembly into the power piston which results in pin “B” moving forward. The lack of movement at pin “A” and forward movement of pin “B” causes the lever to pivot at pin “A”. The top of the lever moves forward (left) which results in moving the spool valve (See Figure 9).
The forward movement of the spool valve closes the reservoir port which seals off the power chamber. Continued movement of the spool valve opens the pressure port from the power steering pump allowing pressurized fluid into the power chamber while at the same time maintaining the fluid flow to the steering gear.