Retract/Extend Valve Installation - All RVA Systems

Prior to working on the leveling system:

1. Verify the jacks are completely retracted.
2. Open all the manual retract valves to ensure there is no pressure in that cavity.
3. While the retract valve (poppet) and extend valves (spool) look the same when installed, they are completely different in design and operation.
4. 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 first 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 initially installed using Loctite.
• Remove the 3/8" nut, and 12 volt coil assembly. This will expose the hydraulic stem for cleaning and removal.

Removal of the stem/valve:

• Cleaning the area prior to removal is important to keep dirt and foreign objects out of the hydraulic unit.
• Use penetrating fluid, and a brush to clean the area around the 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 fluid will be lost. Before installing a stem valve clean the seal surface on the manifold.

Installation of the stem/valve:

• 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 purpose and could damage the threads on the aluminum manifold.

Install the coil on the stem:

• Slide the coil on the stem, and install the retaining nut with Loctite. Tighten the nut to 36 inch pounds. Again it is important not to over-tighten. Over-tightening this retaining nut can distort the stem valve and cause it to not function properly.