Lippert 116658 Crown Gear for RV Slide-Out Mechanisms -- 26 Tooth, 12 Diametral Pitch, Powder Metal

The Right Gear for Lippert Above-Floor Slide-Out Systems

Lippert above-floor slide-out mechanisms rely on a matched set of drive gears to translate motor torque into precise rack-and-pinion movement. The crown gear (part 116658) is the large mating gear in this drivetrain. When teeth chip, crack, or wear flat -- often after years of seasonal cycling or a single overload event -- the entire slide-out loses reliable motion control.

This replacement crown gear is manufactured to FC-0208-50 powder metal specification, the same material standard used in the original drivetrain. The sintered powder metal construction provides consistent tooth geometry, adequate hardness for repeated load cycling, and dimensional stability across temperature extremes common in RV use.

What Causes Crown Gear Failure?

Slide-out crown gears typically fail for one of three reasons:

• Normal wear after high cycle counts -- full-timers and seasonal users who extend and retract slides daily can wear tooth faces over several years.
• Overload events -- slides jammed by awning straps, debris, or a blocked room object can shear or crack individual teeth under motor torque.
• Lack of lubrication -- dry gear sets generate accelerated tooth wear; some owners neglect the slide-out mechanism in their annual maintenance routine.

If your slide-out grinds, hesitates, or fails to travel fully in or out, inspect the crown gear teeth before replacing the motor or entire drive unit. A worn crown gear is often the least expensive fix in the system.

Installation Overview

Crown gear replacement is a moderate DIY task for owners comfortable working under or alongside their slide-out mechanism. General steps include:

• Retract the slide-out fully and disconnect shore power or battery to prevent accidental motor activation.
• Access the slide-out drive assembly -- location varies by floorplan, but is typically accessible from inside the RV or via a panel in the slide room.
• Remove the drive motor and gear housing cover to expose the crown and pinion gears.
• Slide the worn crown gear off the drive shaft (0.625 in bore over the shaft), install the new gear, and reassemble in reverse order.
• Apply a gear-compatible grease to all tooth contact surfaces before closing the housing.

Gear Specifications

System Compatibility

What Is and Is Not Included

Technical Notes