When your hydraulic slide-out moves sluggishly, stalls, or loses pressure mid-travel, the valve body is often the culprit. The Lippert 138420 is a direct OEM-spec replacement valve body designed for non-restricted hydraulic slide-out systems. It restores full, unrestricted hydraulic flow so your room extends and retracts reliably -- at the campsite or on the road.
Lippert hydraulic slide-out systems are found across a wide range of Class A motorhomes, fifth wheels, and travel trailers. Over time, the valve body can wear, develop internal leaks, or become contaminated by degraded hydraulic fluid -- resulting in slow movement, incomplete travel, or a room that won't hold position. Part 138420 is the non-restricted variant, meaning it does not intentionally meter or throttle flow, allowing the hydraulic actuator to move at the rate the pump and cylinder naturally support.
This is a purpose-built replacement, not a generic hydraulic valve. It matches the port configuration, thread specifications, and flow characteristics of the original Lippert hydraulic slide-out valve block, making installation straightforward for anyone already familiar with the system layout.
Designed for unrestricted hydraulic fluid passage -- no internal metering orifice -- so the slide extends and retracts at full system speed without artificial throttling.
Lippert factory part number 138420. Matches original port layout, thread sizing, and valve body envelope for drop-in installation on compatible systems.
Compatible with Lippert hydraulic slide-out systems used across numerous Class A, Class C, fifth-wheel, and travel trailer platforms built by major OEMs.
Replaces a valve body that has developed internal leakage, spool wear, or contamination -- correcting slow travel, mid-stroke stalling, or a room that drifts inward under load.
Lippert hydraulic slide-out valve bodies come in two basic configurations: restricted and non-restricted. A restricted valve body contains a calibrated orifice or spool that limits flow rate, intentionally slowing slide travel for smoother, more controlled movement -- commonly used in systems where uncontrolled speed could cause leveling or structural issues. A non-restricted valve body like the 138420 has no such internal restriction. Fluid passes through at the full rate the pump delivers, making it the correct replacement for systems originally equipped this way.
Installing a restricted valve body in place of a non-restricted one (or vice versa) will produce incorrect slide behavior -- either uncontrolled speed or sluggish travel. Always confirm which type your system requires before ordering. If your current valve body is stamped, tagged, or identified as non-restricted, the 138420 is the correct match.
Replacement of the valve body on a Lippert hydraulic slide-out system is a hands-on job requiring basic hydraulic system knowledge. The system must be depressurized before any fittings are loosened. Have absorbent rags and a drain pan on hand -- residual fluid will be present in the lines even after pump shutdown.