Product Description
Precision sealed bearing assembly for manual pallet jack load and steering wheel applications, manufactured to SAE 52100 specifications, suitable for standard pallet truck wheels. Factory lubricated, integral rubber seals for dust protection. No cross-reference part numbers available.
Specifications
Material & Construction
| Race Material | High carbon chromium steel (SAE 52100 grade) |
| Ball Material | SAE 52100 hardened steel |
Part Numbers
| Manufacturer Part Number | 3057689 |
Frequently Asked Questions
Q: What is the 3057689 sealed bearing assembly?
A: The 3057689 is a precision sealed bearing assembly manufactured to SAE 52100 specifications for manual pallet jack load and steering wheel applications. It is a complete factory-lubricated unit with integral rubber seals for dust and contamination protection.
Q: What materials are used in the 3057689 bearing assembly?
A: The 3057689 race is manufactured from high carbon chromium steel (SAE 52100 grade) and the balls are SAE 52100 hardened steel. These materials provide superior hardness and wear resistance for continuous load cycling in material handling equipment.
Q: Which pallet jack wheel types does the 3057689 fit?
A: The 3057689 is suitable for standard pallet truck load wheels and steering wheels across Crown, Toyota, Raymond, Yale, Hyster, and comparable manual pallet jack models. Verify wheel hub diameter and bearing bore dimensions match your equipment before ordering.
Q: What does factory lubrication mean, and does the bearing need re-lubrication?
A: The 3057689 arrives pre-packed with grease that fills the bearing cavity and provides initial lubrication. The integral rubber seals retain grease and block water and debris. Standard practice is to inspect seals annually; if seals are damaged, the bearing must be replaced. Do not attempt to re-lubricate sealed bearing assemblies.
Q: How do integral rubber seals extend bearing life?
A: The integral rubber seals on the 3057689 prevent dirt, moisture, and debris from contaminating the grease and bearing surfaces. This extends service life significantly compared to open bearings, particularly in wet or dusty warehouse environments.
Q: How long does a 3057689 bearing assembly typically last?
A: Under normal warehouse conditions with regular floor inspection, sealed bearing assemblies typically last 3 to 5 years. Life is reduced in outdoor, wet, or cold storage environments where exposure to moisture accelerates seal degradation. Replace immediately if seals are cracked or if the wheel makes grinding noise or wobbles.
