Product Description
This load wheel kit offers high-quality Ultra-Poly (70D) wheels designed to enhance the performance and longevity of your equipment. The non-marking construction prevents scuffs on all surfaces, and the quiet operation ensures minimal disruption in any environment. Each kit includes bearings, axles, and fasteners, allowing for quick and easy installation.
Compatibility: Fits pallet jacks made by Harbor Freight, model 39939. SKU: GWK-39939-LW
Specifications
Material & Construction
| Wheel Material Composition | Ultra-Poly thermoplastic polyurethane compound |
| Wheel Durometer Hardness | 70D Shore D hardness scale |
Part Numbers & Compatibility
| Manufacturer Part Number | GWK-39939-LW |
| Compatible Equipment Model | Harbor Freight Model 39939 |
Frequently Asked Questions
Q: Will GWK-39939-LW fit pallet jacks from other manufacturers or is it Harbor Freight exclusive?
A: GWK-39939-LW is manufactured specifically for Harbor Freight model 39939 pallet jacks only. It is not compatible with Uline, Dayton Grainger, or other brand models. Cross-fitting this kit to a different jack will cause mounting issues and void equipment warranty. Verify your jack bears the Harbor Freight nameplate and model number 39939 before purchase. If unsure of your model, contact the jack manufacturer or check the rating plate under the handle.
Q: What makes the Ultra-Poly 70D wheels non-marking and when would I use this feature?
A: The Ultra-Poly 70D thermoplastic polyurethane compound is formulated to prevent permanent scuffs and marks on polished concrete, tile, and decorative flooring. This is critical for retail environments, display areas, and customer-facing spaces where floor appearance matters. Standard rubber wheels leave black marks that are difficult to clean. GWK-39939-LW wheels maintain floor aesthetics while delivering quiet, smooth operation ideal for customer-occupied areas.
Q: Is plug-and-play installation possible for GWK-39939-LW or do modifications to the jack frame occur?
A: GWK-39939-LW is a direct replacement with no frame modifications required. The kit includes pre-assembled wheel units with integrated bearings, axles, and all fasteners. Installation is plug-and-play: remove the old wheel assembly fasteners, slide out the old wheels, install new wheels, and torque fasteners to specification. Installation time is typically 20-30 minutes. Harbor Freight model 39939 jacks have standardized mounting points, so no drilling, welding, or frame adjustment is needed.
Q: What operating noise level can I expect from GWK-39939-LW wheels and how do they compare to standard wheels?
A: GWK-39939-LW wheels operate significantly quieter than standard 92A polyurethane wheels due to the softer 70D durometer and polyurethane tread design that absorbs vibration. In retail or office settings, the reduced noise improves customer experience and reduces operator fatigue. Noise reduction is approximately 40-50 percent compared to harder wheels. This quiet operation is one of the primary reasons to choose this kit for display floor and customer-facing warehouse applications.
Q: How often should GWK-39939-LW wheels be replaced and what causes premature failure?
A: Wheel lifespan depends on usage intensity and floor conditions. In light retail use, expect 24-36 months. In high-volume warehouse use, replacement may be needed every 12-18 months. Premature failure occurs when wheels contact sharp objects, metal debris, or are run over curbs. Flat spots develop if the jack sits stationary under load for extended periods. Inspect wheels monthly and replace when tread depth reaches 25 percent of original thickness or visible cracking appears.
Q: Does GWK-39939-LW require any special bearing maintenance or re-greasing?
A: No bearing maintenance or re-greasing is required. GWK-39939-LW wheels come with sealed ball bearings that are pre-lubricated and maintenance-free for the life of the wheel. Attempting to grease or service the bearings will damage the seals and cause premature failure. After installation, simply monitor the wheels during use. If you notice grinding sounds or excessive resistance, the bearing has likely failed and the entire wheel assembly must be replaced.