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Prior to working on the leveling system, verify the jacks are completely retracted. Also open the appropriate manual retract valve. While the retract valve (poppet) and extend valves (spool) look at the same when installed in the manifold, they are completely different in design and operation. Both types of valves are susceptible to damage from foreign objects/debris and over-torque.
Before the retract or spool valve stems can be removed , the appropriate electric coil must be removed. Two styles of coils are in use. The rst style is comprised of an electric coil, metal cover, and metal base for the cover. The second style is a single piece unit with the metal cover and the base molded into the electric coil. In either style, a 3/8 inch nut is used to hold the coil on the retract or extend stem. The nuts are generally held in place by Loctite unless they have been removed previously.
-Remove the 3/8" nut, and 12 volt coil assembly. This will expose the hydraulic stem for cleaning and removal. Cleaning the area prior to removal is important to keep dirt and foreign objects out of the hydraulic uid. Use penetrating uid and a brush, and clean the area around the area of the valve. Once clean, then use compressed air to remove remaining debris prior to removal.
-Use a deep socket to remove the stem from the manifold. There will be no pressure so only drops of uid will be lost. Before installing the stem valve clean the seal surface on the manifold.
-Lubricate the o-ring on the valve with Dexron ATF prior to installation. When installing the stem do not use more than 144 inch pounds of torque. Since the stem is sealed with the o-ring, extra torque will serve no good purpose and could damage the threads on the manifold.
-Install the coil on the stem and install the retaining nut with Loctite. Tighten the nut to 36 inch pounds.