Product Description
Load Wheel Assembly
Frequently Asked Questions
Q: Does SU 375-A assembly include replaceable bearings or are they sealed-for-life?
A: SU 375-A uses sealed-for-life tapered roller bearings packed with grease at the factory. Bearings cannot be repacked or serviced. If bearings fail, you must replace the entire SU 375-A assembly. Expected bearing life is 4,000 to 5,000 operating hours under normal load and floor conditions.
Q: Is SU 375-A a compatible replacement for Toyota FGUJ30 load wheel assembly?
A: SU 375-A and Toyota FGUJ30 share the same 8-inch bolt pattern but differ in hub bore diameter (1.75 inches versus 2 inches on Toyota). Do not force SU 375-A onto Toyota axles as the loose fit will cause wobble and unsafe operation. Order the correct Toyota part or verify your truck is an SU-compatible model before purchasing SU 375-A.
Q: How do I remove and install SU 375-A assembly on a three-wheel truck?
A: Lift and support the truck on blocks. Remove the axle pin or fasteners holding the assembly. Slide the old assembly off the axle and onto a workbench. Install the new SU 375-A unit by sliding it fully onto the axle, aligning bolt holes, and torquing fasteners to 50 foot-pounds. Rotate by hand to confirm smooth bearing operation before lowering the truck.
Q: Can I use SU 375-A on both front and rear wheels of a three-wheel truck?
A: No. Front steering wheels need lighter assemblies like SU 359-A or SU 351-XL-A for responsive steering control. SU 375-A is designed for rear non-steering wheels only. Using SU 375-A in front increases steering effort by 20 to 30 percent and causes driver fatigue. Always consult your truck manual for correct front and rear specifications.
Q: What maintenance does SU 375-A assembly require during truck operation?
A: SU 375-A requires no scheduled maintenance beyond weekly visual inspections for cracks, debris, or uneven wear. Check that fasteners remain tight (re-torque if loose) and listen for grinding or clicking noises from bearings. Inspect wheel lateral runout monthly with a straight edge to detect bent hubs. Clean tread and sidewalls of packed debris every month to monitor wear depth.
Q: What causes catastrophic failure of SU 375-A and how do I prevent it?
A: Bearing seals fail from water ingress or impact damage, allowing grease to leak and bearings to corrode. Wheel separates from hub if fasteners are under-torqued or if the hub has been bent by impact. Prevent failure by torquing to specification, avoiding curbs and obstacles, and inspecting assemblies weekly. Replace immediately if you hear grinding noises or detect radial play (rock the wheel by hand).