Product Description
Technical specification for SU 645-XL, a polyurethane XL 97A hardness solid load wheel for electric lift trucks, featuring standard industrial sealed bearings and press-fit mounting. No cross-reference part numbers, detailed dimensional data, or performance ratings are available from current sources.
Specifications: 4.000 inch diameter x 3.625 inch width (4.000" x 3.625" | 4 x 3.63 wheel | 4 x 3-5/8 | 101.60mm x 92.07mm)
Specifications
Construction
| Pressure Ratings | Not applicable |
| Flow Rates | Not applicable |
Material
| Wheel Material | Polyurethane XL, Shore 97A hardness |
Part Numbers
| OEM Part Number | SU 645-XL |
Wheel Dimensions
| Material | Cushothane XL |
| Outside Diameter | 4 |
| Inside Diameter | 1.875 |
| Width Side to Side | 3.625 |
| Tread Profile | Angle |
| Bore Depth | 0.623 |
| Hub Width | 3.625 |
| Bore Outside Diameter | 2.0467 |
Frequently Asked Questions
Q: What is the hardness difference between SU 645-XL and standard polyurethane wheels?
A: The SU 645-XL features Cushothane XL material at 97A Shore hardness, which is significantly harder and more wear-resistant than industrial grade 93A. The 97A rating extends tread life in high-speed or rough-floor applications such as outdoor concrete or damaged warehouse floors. XL hardness resists tear and puncture better than softer compounds but may provide slightly less grip on smooth, clean floors. Choose 97A XL for maximum durability in demanding environments.
Q: Is the SU 645-XL a direct bolt-on replacement for my existing SU 645-A wheel?
A: Yes, the SU 645-XL is dimensionally identical to the SU 645-A with the same 4.0 inch diameter, 3.625 inch width, 1.875 inch inside diameter, and standard industrial sealed bearings. The replacement is plug-and-play if your hub and bolt pattern match. The only difference is the material hardness. No modifications to the truck are required. Verify your original wheel SKU and hub specification before ordering to ensure compatibility.
Q: How long will the SU 645-XL wheel assembly last compared to standard polyurethane wheels?
A: The 97A Cushothane XL tread typically extends service life by 40-60 percent over industrial grade 93A in abrasive environments. Expected lifespan is 5-8 years in high-use warehouse or outdoor applications. Life depends on floor type, duty cycle, and load weight. Smooth, clean floors may see minimal benefit over softer compounds. Rough, damaged, or outdoor concrete will show significant durability gains with XL hardness.
Q: What maintenance is required for the SU 645-XL sealed bearing assembly?
A: The SU 645-XL uses standard industrial sealed bearings that are maintenance-free and do not require greasing. Inspect the wheel monthly for debris, tread damage, or loose fasteners. Clean the tread with a damp cloth to remove dust and floor contaminants. Check hub bolts with a torque wrench annually to confirm they remain tight. Do not attempt to repack or service the sealed bearings; replace the entire assembly if bearing noise or wobble develops.
Q: Can I use the SU 645-XL on outdoor or uneven floor surfaces?
A: Yes, the 97A Cushothane XL is specifically engineered for outdoor and rough-floor applications. The higher hardness resists puncture and tearing from debris, gravel, cracks, and damaged concrete. Performance is superior to softer wheels in these environments. However, verify that your lift truck frame and suspension are rated for outdoor duty. Always inspect the wheel before use for embedded rocks or sharp debris that could cause damage. XL wheels excel on exterior surfaces.