Harley-Davidson Softail Inner Primary Cover (60620-94B)
Updated June 25, 2026
The Harley-Davidson Softail Inner Primary Cover (OEM part number 60620-94B) is the cast aluminum housing that encloses the primary drive chain and clutch assembly on the left side of the engine. It serves as the inner wall of the primary chaincase, sealing the lubricant and protecting the drivetrain components. This cover is specific to Softail models produced from 1994 through 2006 and is available in natural silver or black wrinkle finishes.
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Function and Design
The inner primary cover bolts directly to the engine case and transmission, forming the inboard side of the primary chaincase. It houses the starter clutch (bendix) and supports the mainshaft bearing that aligns the transmission input shaft. The cover is precision-cast from aluminum for strength and heat dissipation. A gasket seals the mating surface to prevent oil leaks. Some versions include the inner bearing and seal pre-installed; others require transfer of these components from the old cover.
Vehicle Fitment
This cover fits all Harley-Davidson Softail models from 1994 to 2006, including FXST (Standard, Night Train), FXSTB, FXSTD (Deuce), FXSTSI, FLST (Heritage), FLSTC (Heritage Classic), FLSTF (Fat Boy), FLSTN (Deluxe), FLSTNI, and FLSTFSE (Screamin' Eagle). It is not compatible with Touring, Dyna, or Sportster models due to different engine/transmission mounting and primary chaincase geometry. Always verify the part number 60620-94B on your existing cover before replacement.
Common Issues and Diagnosis
Over time, the inner primary cover can develop cracks around the mounting ears or the starter clutch bore, especially if over-torqued or subjected to vibration. The bearing bore may wear, causing misalignment and premature bearing failure. Symptoms include primary oil leaks (often dripping from the bottom of the cover), unusual whining or grinding noises from the primary area, and difficulty engaging the starter. Inspect the cover for hairline cracks, warped mating surfaces, and worn bearing seats. A used cover should be checked for straightness on a flat surface.
Installation Notes
Replacement requires removing the outer primary cover, derby cover, and clutch assembly to access the inner cover. Always use a new gasket and apply a thin layer of primary chaincase sealant to the bolt threads. Torque the cover bolts in a crisscross pattern to the factory specification (typically 84–108 in-lbs). Ensure the starter clutch engages freely before final assembly. If the old bearing is reused, inspect it for roughness; if the new cover does not include a bearing, transfer the original or install a new one. After installation, refill the primary with the correct type and amount of fluid.
