Product Description
U cup
Frequently Asked Questions
Q: What does the TO 00591-75278-81 U cup seal do?
A: The TO 00591-75278-81 is a U-cup seal (U-ring) designed for hydraulic or pneumatic cylinders in Toyota electric pallet jacks. U-cups are dynamic seals that prevent fluid leakage in rod-seal applications.
Q: What material is the TO 00591-75278-81 U cup made from?
A: The TO 00591-75278-81 is manufactured from polyurethane or nitrile elastomer compounds standard for hydraulic seal applications. These materials resist petroleum hydraulic fluid and maintain flexibility across typical operating temperatures in electric lift equipment.
Q: Is the TO 00591-75278-81 a wear item that needs regular replacement?
A: Yes. U-cup seals are wear items. Replace if you observe fluid leakage around the cylinder rod or loss of system pressure. Typical replacement interval is 2 to 4 years depending on duty cycle and fluid contamination.
Q: What pressure rating does the TO 00591-75278-81 support?
A: U-cup seals in Toyota electric pallet jacks are rated for standard hydraulic pressures up to 3000 PSI. The exact rating depends on the cylinder assembly and installation depth. Verify against your equipment documentation.
Q: Can the TO 00591-75278-81 be cross-referenced to other brands?
A: The TO prefix indicates this is a Toyota OEM part. While similar U-cup seals exist for Crown, Raymond, and Hyster equipment, dimensions and bore specifications are brand-specific. Do not assume interchangeability.
Q: Is the TO 00591-75278-81 compatible with all hydraulic fluids?
A: The TO 00591-75278-81 is designed for standard petroleum hydraulic fluids. Before switching to synthetic fluids, verify compatibility with the seal material to avoid swelling or degradation.
