Toshiba 6LJ54057000 Idle Gear – GEAR-04H-42-6-IDLE-21X for e-STUDIO 2050C, 2555C and ES9455 Series

Drive Train Component for Colour e-STUDIO Chassis

The Toshiba 6LJ54057000 idle gear is a genuine drive component for the colour e-STUDIO 2050C, 2550C, 2555C, 3055C, 3555C, 4555C and 5055C series, plus the ES9455, ES9465 and ES9475 multifunctionals. Toshiba catalogues the part as GEAR-04H-42-6-IDLE-21X. It sits in the drive train and transfers rotational motion between the main motor and the driven assembly.

The gear measures approximately 21 mm across the tooth face and uses a module-1 tooth profile. It runs on a steel shaft with a press-fit bore and carries a nylon or POM body for quiet operation. The 42-tooth count sets the drive ratio for the downstream component, so substituting a different gear changes timing and causes jams or image defects.

Worn idle gears produce a characteristic grinding or ticking sound during print cycles. The noise usually appears on start-up and fades once the drive reaches speed. Tooth wear also introduces backlash, which shows up as banding or misregistration on the printed page. Replace the gear when the teeth show flattening, cracking or missing material at the root.

Service the gear during a scheduled maintenance visit rather than as a roadside repair. Remove the rear cover and the drive unit shield to reach the gear train. Note the washer order before pulling the shaft. Fit the new gear with the marked face outward, refit the retaining clip and confirm free rotation by hand. Run a test print and listen for the tick returning under load. A correctly seated gear runs silent across the full speed range.

Key Features

• Genuine Toshiba Drive Gear
  Original 6LJ54057000 moulding, not a third-party copy with altered tooth geometry.

• 42-Tooth Module-1 Profile

  • Matches the factory drive ratio for the downstream assembly.
  • Nylon or POM body damps vibration and reduces running noise.

• Press-Fit Shaft Bore
  The bore seats on the original steel shaft without adapters or shims.

• Direct Replacement Part
  Fits the gear train without modification to the drive unit or shield.

• Wide Chassis Coverage
  Covers the 2050C through 5055C range and the ES9455/65/75MFP family.

• Noise and Backlash Fix
  Restores correct mesh clearance and removes the tick or grind from a worn gear.

Specifications

What’s in the Box

• Idle gear

Why Choose the Genuine Idle Gear

• Correct tooth count and module keep the factory drive ratio intact.

• Genuine moulding holds its profile longer than unbranded replacements.

• The press-fit bore avoids shaft wear from a loose aftermarket gear.

• One part covers the 2050C, 2555C and ES9455 machine families.

• Quiet running reduces operator complaints about drive noise.

• Cheap compared with replacing the entire drive unit after a gear failure.

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