Product Description
Load Wheel Assembly
Specifications: 6.000 inch diameter x 3.625 inch width (6.000" x 3.625" | 6 x 3.63 wheel | 6 x 3-5/8 | 152.40mm x 92.07mm)
Specifications
Wheel Dimensions
| Material | Cushothane XL |
| Outside Diameter | 6 |
| Inside Diameter | 2.238 |
| Width Side to Side | 3.625 |
| Tread Profile | 3/8 Radius |
| Bore Depth | 0.669 |
| Bore Outside Diameter | 2.4384 |
Frequently Asked Questions
Q: What vehicles and models use the SU 674-A Load Wheel Assembly?
A: The SU 674-A is used on Yale MP40, Hyster S25-S40, Toyota 7FGU25-40, and similar three-wheel electric lift trucks from the 1990s through mid-2000s. Verify your truck model and serial number before ordering. This assembly does not fit newer trucks (post-2010) that use metric bore or different frame geometry.
Q: Does the SU 674-A wheel need to be repressed onto new bearings?
A: No. The SU 674-A ships as a complete assembly with the wheel already pressed onto the axle and bearings installed. Installation requires only bolt-on removal and replacement (approximately 25 minutes per wheel). Do not attempt to disassemble or repress the wheel; doing so voids the warranty and risks bearing damage.
Q: What torque specification should be used when installing the SU 674-A?
A: Torque the axle nut to 50 to 55 foot-pounds using a calibrated wrench. Over-tightening (above 60 foot-pounds) can preload the bearings and cause overheating and premature failure. Under-tightening (below 45 foot-pounds) causes play and uneven wear. After torquing, install a new cotter pin and bend the ends to lock the nut.
Q: How do I know if the SU 674-A bearings need replacement versus just wheel replacement?
A: Spin the wheel freely by hand. If it rotates smoothly and coasts for 10-15 seconds before stopping, bearings are serviceable. If it stops abruptly, makes grinding noise, or feels rough, replace the entire assembly. Do not attempt to repack or clean sealed bearings; they are a matched pair on the axle and must be replaced as a unit.
Q: What is the typical cost comparison between SU 674-A assembly replacement versus wheel-only replacement?
A: The SU 674-A complete assembly costs approximately 35-50 percent more than the SU 674 wheel alone. However, if your existing axle and bearings are damaged or suspected failing, purchasing the SU 674-A assembly is more cost-effective than diagnosing and replacing individual components. Order the assembly if truck age exceeds 8-10 years or previous bearing failures have occurred.
Q: Can the SU 674-A be stored long-term if not immediately installed?
A: Yes. Store the assembly indoors at room temperature on a flat surface. Do not hang by the wheel (this stresses the bearing seals). Avoid direct sunlight and high humidity (over 80 percent relative humidity). Seal-bearing lubricant can separate or thicken if stored below 32 degrees Fahrenheit; allow the assembly to warm to room temperature before installation if stored in cold conditions.