Product Description
Cup, bearing
Frequently Asked Questions
Q: What is the 3131139 bearing cup and what does it do?
A: The 3131139 bearing cup is the outer raceway component of a tapered or cylindrical roller bearing assembly. In electric lift trucks, it supports the rolling elements (balls or rollers) and transfers loads from the rotating shaft to the stationary bearing housing. It works in tandem with an inner race cone.
Q: Which electric lift truck equipment is the 3131139 bearing cup compatible with?
A: The 3131139 is used in electric pallet jacks, electric hand trucks, and electric reach trucks from Crown, Toyota, Raymond, Yale, Hyster, and Jungheinrich. It is typically found in wheel hubs, motor shafts, or lift mast pivot assemblies. Confirm your equipment model and serial range for accurate fitment.
Q: What material is the 3131139 bearing cup manufactured from?
A: Bearing cups are manufactured from hardened steel to withstand rolling contact stresses and prevent deformation. The steel is precision-machined to tight tolerances to match the bearing cone and rolling elements. This hardness ensures durability across the typical 5 to 10 year service life.
Q: How do I diagnose a worn or failed 3131139 bearing cup?
A: Signs of bearing cup wear include: grinding or rumbling noise from the wheel or pivot assembly, increased rolling resistance, visible pitting or spalling on the raceway surface (if dismounted), or excessive side play when the bearing is moved manually. These indicate bearing cup deterioration and require replacement.
Q: Is the 3131139 bearing cup sold separately or as part of a complete bearing assembly?
A: Bearing cups are typically sold as individual components. When replacing a bearing, both the cup (outer race) and the cone (inner race) should be replaced together to ensure proper fit and load distribution. Using a mismatched cone and cup reduces bearing life and performance.