Product Description
The SU S621 Load Wheel is expertly designed for electric lift truck and pallet jack applications, ensuring reliable performance in demanding environments. This wheel is constructed from reinforced nylon, providing durability and a non-marking finish ideal for industrial material handling.
Specifications: 3.250 inch diameter x 4.200 inch width (3.250" x 4.200" | 3.25 x 4.2 wheel | 3-1/4 x 4.2 | 82.55mm x 106.68mm)
• Made from high-strength reinforced nylon
• Non-marking finish to protect surfaces
• Engineered for compatibility with OEM SU 621 wheel assemblies
This load wheel is perfect for enhancing the efficiency of your electric lift trucks and pallet jacks, ensuring smooth operation and longevity.
Specifications
Material
| Wheel Material | Reinforced nylon polymer |
| Bearing Material | Carbon steel races with alloy steel balls |
| Finish | Natural nylon polymer, non-marking |
Part Numbers
| OEM Part Number | SU 621 |
Wheel Dimensions
| Material | Cushothane XL |
| Outside Diameter | 3.25 |
| Inside Diameter | 1.875 |
| Width Side to Side | 4.19 |
| Bore Depth | 1.18 |
| Hub Width | 4.19 |
| Bore Outside Diameter | 2.0467 |
Frequently Asked Questions
Q: What is the load capacity and diameter of the SU S621-XL wheel?
A: The SU S621-XL is a 3.25 inch diameter by 4.19 inch width load wheel with a 1.875 inch inside diameter and 25mm bearing bore. It is rated for electric lift truck applications with reinforced nylon construction. Always verify your truck model documentation for maximum load limits, as capacity depends on the entire truck assembly, not just the wheel.
Q: Is the SU S621-XL compatible with Yale, Crown, or other brand lift trucks?
A: The SU S621-XL fits electric lift trucks with a 25mm bearing bore and 3.25 inch diameter wheel mount. Compatibility depends on your truck model and mounting system. Cross-reference your OEM part number (SU 621 or SU S621-XL) with your truck documentation. If you have a Yale, Hyster, or Crown model, provide the serial number or model designation for exact fitment confirmation.
Q: Does this wheel require bearing maintenance or replacement?
A: The SU S621-XL has carbon steel races with alloy steel balls. Bearings are sealed in the wheel hub. Do not attempt to repack or service the bearing. If the wheel spins loosely, binds, or makes grinding noise, replace the entire wheel assembly. Typical service life is 2-4 years depending on usage intensity and surface conditions.
Q: What does non-marking finish mean and why does it matter?
A: Non-marking means the reinforced nylon tread does not leave black or colored marks on floors. This is critical for food processing, pharmaceutical, and retail environments where floor contamination is not acceptable. If your facility requires a non-marking wheel, verify this specification before ordering as alternative materials may mark surfaces.
Q: How do I know if my SU S621-XL wheel needs replacement?
A: Replace the wheel if you observe flat spots or chunking on the tread, visible bearing play or movement when spinning the wheel by hand, audible grinding or squeaking when the truck is in operation, or if the wheel does not spin freely. A worn wheel reduces load stability and can damage the lift truck frame.
Q: Can I swap wheels between my drive wheels and load wheels?
A: No. Drive wheels and load wheels have different mounting systems and material specifications. Using a load wheel on a drive motor assembly will cause slippage and operational failure. Always use the correct wheel type for each position on your truck.