Kenworth Window Regulator R21-1004 HLK2555

The R21-1004 is the left-hand (driver-side) manual window regulator for Kenworth trucks. It is the direct counterpart to the R21-1004R (passenger side) and is used in models equipped with manual crank windows. 

Key Specifications

Position: Left-hand (LH) / Driver side.

Operation: Manual (crank-driven).

Material: Typically constructed from high-quality steel and stamped components.

Weight: Approximately 5 lbs. 

Fitment & Compatibility

This regulator is designed for classic and heavy-duty Kenworth cabs, commonly fitting: 

T600 Series: T600, T600A, and T600B (mid-1980s to late 2000s).

W900 Series: W900L and W900 Aerocab.

T800 & T300: Standard workhorse models.

C500: Heavy-haul/off-road models

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 Window Regulator R21-1004 HLK2555