GRAND DESIGN IMAGINE 2500RL - Stabilizer Jack Replacement

GRAND DESIGN IMAGINE 2500RL – Stabilizer Jack Replacement

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Complete repair guide for the GRAND DESIGN IMAGINE 2500RL – Stabilizer Jack Replacement.

Parts & Tools You’ll Need

Step 1: Diagnose and Prepare the Work Area

Begin by leveling your Grand Design Imagine 2500RL on a flat, stable surface and engaging the manual landing gear for safety. Locate all four stabilizer jacks underneath the trailer frame—typically positioned at the corners—and visually inspect each one for signs of failure such as fluid leaks, bent rods, or non-responsive motors. Document which jacks are malfunctioning by attempting to extend and retract them using the Jack Control Switch Panel, noting any grinding sounds, slow response times, or complete electrical failures. Set up your workspace with adequate lighting, jack stands rated for your trailer’s GVWR, and ensure you have the Lippert 285346 Electric Stabilizer Jack units ready for installation.

Step 2: Remove Power and Disconnect Electrical System

Disconnect the 12V battery negative terminal from your RV’s battery bank to eliminate any electrical hazards during the repair. Locate the main jack wiring harness connection point—typically found near the main control panel or in the undercarriage near the frame rails—and carefully disconnect the plug by squeezing the release tab and gently pulling the connector apart. Take a photo of the wiring configuration before disconnection to aid in reassembly, or use a multi-meter to trace the positive and negative leads. Remove any inline fuses or circuit breakers associated with the stabilizer jack system and set them aside in a labeled container.

Step 3: Remove Mounting Hardware and Lift Jack Out

Using a socket wrench, remove the four bolts that secure the faulty stabilizer jack to the trailer frame—these are typically 3/8-inch bolts torqued to 45-55 ft-lbs on the Grand Design Imagine 2500RL. Support the jack with your other hand or a small hydraulic jack as you remove the final bolt to prevent it from dropping suddenly. Carefully slide the old jack horizontally away from the mounting bracket, noting the orientation of the mounting pad and any rubber isolators that may be present. Inspect the mounting bracket for corrosion, cracks, or damage; clean the area with a wire brush if necessary before installing the replacement unit.

Step 4: Install the New Lippert Electric Jack Unit

Position the new Lippert 285346 Electric Stabilizer Jack into the mounting bracket, ensuring the lift rod is fully retracted and the unit is oriented identically to the original configuration. Align the four mounting holes and insert the Jack Mounting Hardware Bolt Kit bolts by hand first to ensure proper thread engagement without cross-threading. Torque each bolt in a crisscross pattern (similar to tightening wheel lugs) to 50 ft-lbs, checking your work by re-torquing each bolt a second time after completing the circle. Verify that the jack extends and retracts smoothly by hand-cycling the rod several times—it should move with moderate resistance and show no binding or rough spots.

Step 5: Connect the Electric Jack Wiring Harness

Retrieve the Electric Jack Wiring Harness and route it along the existing trailer frame conduit, securing it with adhesive-backed clips or wire ties every 12-18 inches to prevent chafing against sharp edges. Connect the positive (red) lead to the jack motor first, followed by the negative (black) lead, ensuring each connector is fully seated and locked with an audible click. For multiple jacks in a series configuration, connect the harness through each jack sequentially, using the provided junction connectors to daisy-chain the units together. If upgrading to the Jack Controller Upgrade (Lippert OneControl), follow the manufacturer’s wiring diagram closely, as this system uses a dedicated CANbus communication protocol rather than traditional parallel wiring.

Step 6: Reconnect Power and Test Individual Jack Operation

Reconnect the negative battery terminal and verify that power is reaching the Jack Control Switch Panel by observing the indicator lights—they should illuminate steadily without flickering. Activate each stabilizer jack individually using the control panel, listening for motor engagement and observing the rod extension speed, which should be smooth and consistent. Allow each jack to fully extend and retract through two complete cycles, watching for any hesitation, unusual noises, or abnormal heat buildup around the motor housing. If you’ve installed the Lippert OneControl system, use its diagnostic function to verify that all four jacks are communicating properly and showing correct position sensors.

Step 7: Perform Final Verification and System Validation

With your Grand Design Imagine 2500RL still leveled and supported by manual landing gear, deploy all four stabilizer jacks simultaneously and allow them to fully extend under load, taking 60-90 seconds per jack. Monitor the control panel for any error codes or warning lights during operation, and physically inspect each jack for fluid weeps, unusual flexing, or misalignment. Lower all four jacks completely and retract them, then repeat the full deploy-and-retract cycle one more time to confirm consistent operation and response times. Document the successful repair in your maintenance log, including the date, parts replaced, and torque specifications applied, and advise future service intervals based on the manufacturer’s recommendations (typically 2-3 years or 10,000 miles).