Product Description
Polyurethane load wheel assembly SU 850-XL for electric pallet trucks and stackers. Features a 3.15 inch diameter, precision sealed ball bearing with 20 mm bore, steel core, and 1300 lbs rated load capacity. Manufactured to ASTM D624 standards with Shore A 92 hardness tread for high durability. Compatible with select electric lift truck models requiring SU 850-XL wheel configuration.
Specifications
Material
| Core Material | Steel core, powder coat finish |
| Hardness | Shore A 92 |
Part Numbers
| Manufacturer Part Number | SU 850-XL |
| OEM Part Number | SU 850 |
Frequently Asked Questions
Q: Is the SU S850 equivalent to the SU S850-XL or SU S850 XL?
A: No. The SU S850 has a 3.15 inch diameter and is a smaller wheel than the SU S850 XL (8.25 inch nominal) or SU S850-XL (3.25 inch x 6.5 inch). These are different assemblies for different truck types. Always verify the wheel diameter and width on your truck nameplate before ordering. Mixing sizes will cause handling problems and void warranty.
Q: What is the maximum load capacity of the SU S850?
A: The SU S850 has a rated load capacity of 1300 lbs per wheel. For a four-wheel pallet truck, total load capacity is 5200 lbs under ideal conditions. Do not exceed 1300 lbs per wheel. Operating overloaded wheels will accelerate bearing failure and tread degradation. Always check your truck nameplate for overall truck load limits, which may be lower than wheel rating.
Q: What bearing does the SU S850 use and can it be replaced separately?
A: The SU S850 uses a precision sealed ball bearing with 20 mm bore. The bearing is not serviceable and cannot be replaced separately. If the bearing fails (noise, grinding, or lock-up when spinning by hand), the entire wheel assembly must be replaced. Attempting to disassemble or repack sealed bearings will damage the seal and void warranty.
Q: How do I diagnose bearing wear in the SU S850?
A: Lift the truck front or rear end off the ground and spin each wheel by hand. A healthy bearing will spin freely with minimal resistance and stop only after 30 to 60 seconds. If a wheel stops quickly, makes grinding sounds, or feels rough, the bearing seal is compromised or bearing balls are worn. Replace the wheel immediately; continued operation will cause the bearing to seize and lock the wheel.
Q: What is the material hardness of the SU S850 tread?
A: The SU S850 tread is Shore A 92 hardness, engineered to resist cuts and provide moderate grip on smooth warehouse floors. This hardness is not suitable for outdoors or rough surfaces; the tread will wear rapidly or chunk out if used on gravel, asphalt, or uneven concrete. If your operation requires outdoor use, specify a higher durometer wheel such as the SU S850-XL (97A).
Q: What maintenance schedule should I follow for the SU S850?
A: Inspect wheels weekly for visible cracks, chunks, or flat spots. Check bearing noise during push tests. Do not apply water or solvents to sealed bearings. Clean polyurethane tread with a dry cloth only. If tread depth drops below 0.5 inches, replace all four wheels as a set to ensure even handling. Sealed bearings require no greasing or adjustment.