Toshiba GEAR-08S24-08S21 Main Drive Gear 6LJ76893000 for e-STUDIO

Drive Gear for e-STUDIO Developer Assembly

The Toshiba main drive gear is a replacement component in the main drive assembly of several Toshiba e-STUDIO mono copiers. Toshiba codes the part as GEAR-08S24-08S21 and 6LJ76893000. It transfers torque from the main drive motor into the developer unit gear train. The gear carries an 8S24 and 8S21 tooth designation in the Toshiba parts catalogue.

Technicians fit the gear after removing the rear cover and the main drive assembly. The gear seats on its shaft with a keyed bore and meshes with the adjacent idler. Molded teeth hold mesh tolerance across the contact arc, which limits backlash during rotation. A shoulder on the shaft sets axial position, so the gear cannot walk into the housing. Confirm free rotation by hand before refitting the drive assembly.

Compatible models include the e-STUDIO 2006, 2306, 2506, 2007, 2307, 2507, 2505, 2505H, 2505F, 2303A, 2309A and 2809A series. Toshiba uses this gear across multiple chassis revisions, so confirm the model plate and the drive assembly revision before ordering. Field reports note wear on this gear and the related mixer gears after extended service. Inspect the mating bushings and idler gears during replacement, because toner contamination accelerates tooth wear.

Clean the shaft and the housing bore before pressing the new gear into place. Remove any toner buildup with a dry lint-free cloth. Do not lubricate the gear teeth; the polymer runs dry against the mating idler. Seat the gear fully against the shoulder, then rotate the drive by hand to confirm correct mesh. A binding feel points to a misaligned idler or a worn bushing rather than a defective gear.

Key Features

• Main Drive Assembly Component
  The gear sits in the main drive train and feeds torque into the developer unit.

• Molded Tooth Geometry

  • 8S24 and 8S21 tooth designation per the Toshiba catalogue
  • Holds mesh tolerance against the adjacent idler gear

• Keyed Shaft Interface
  The bore keys to the shaft and prevents rotational slip under drive load.

• Shoulder-Located Axial Position
  The shaft shoulder stops the gear from drifting into the housing.

• Broad Model Coverage
  Fits e-STUDIO 2006 through 2809A series mono copiers.

• Wear Inspection Point
  Check the mixer gears and bushings whenever this gear shows tooth wear.

Specifications

What’s in the Box

• One GEAR-08S24-08S21 drive gear

Why Choose This Drive Gear

• The keyed bore transfers motor torque without rotational slip.

• Molded teeth hold mesh tolerance across the contact arc.

• The shoulder-located fit controls axial position on the shaft.

• Model coverage spans the 2006 to 2809A e-STUDIO range.

• A single gear restores drive function during routine service.

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