Kenworth Manual Window Regulator R21-1004R HLK2556

The R21-1004R is a manual window regulator specifically for the right-hand (passenger) side of Kenworth trucks. It is the standard manual counterpart to the electric models often found in Kenworth's heavy-duty lineup.

• Part Type: Manual Window Regulator.

• Position: Front Right (RH / Passenger Side).

• Manufacturer: TinzerMotor.

• Operation: Manual (hand-cranked mechanism).

Compatible Kenworth Models

This part typically fits Kenworth models with manual window cranks from the mid-1980s through the late 2000s, including:

T600 Series: T600A (1986–1989), T600B (1990–2007), and T600 Aerocab (1994–2007).

W900 Series: W900L and W900L Aerocab (1990–Present).

T800 & T300: T800 (1986–Present) and T300 (1993–2008).

Specialty Models: C500 (1990–Present)

Quality and Testing

TinzerMotor produces these window regulators and window motors with a focus on long-term high quality and mechanical reliability:

Heavy-Duty Construction: Uses thickened steel plate components and reinforced pivot points to prevent the "sagging" or jamming common in lower-quality aftermarket parts.

Extensive Testing: Each unit undergoes rigorous cycle testing, involving thousands of manual rotations under simulated glass weight to ensure the internal gears do not strip or slip over time.

Precision Fit: Designed to align perfectly with the original door mounting holes, ensuring a "bolt-on" installation without the need for drilling or modification.

Please contact: 

Ms Riva  

Wechat/WhatsApp +86 15355970956 

Email: riva@ruishuoautoparts.com

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Kenworth Manual Window Regulator R21-1004R HLK2556