00591-31556-81

Frequently Asked Questions

Q: What seal materials are included in the 00591-31556-81 kit?
A: The 00591-31556-81 contains polyurethane and nitrile seals with virgin PTFE back-up rings. This combination is standard for high-wear hydraulic applications in manual pallet jacks and provides excellent pressure containment.

Q: How is the 00591-31556-81 installed in the main lift cylinder?
A: This seal kit uses press-fit installation. You will need a seal puller or hydraulic press to remove the old seals and install the new ones. Ensure the cylinder bore is clean and free of scores before installation. Apply light machine oil to the new seals before pressing.

Q: Which hydraulic oils work with the 00591-31556-81?
A: The polyurethane and nitrile seals are compatible with standard mineral-based hydraulic oils used in most Toyota manual pallet jacks. Check your jack documentation for the recommended ISO viscosity grade and do not substitute synthetic oils without verification.

Q: What symptoms indicate the main lift cylinder seals need replacement?
A: Signs of seal wear include slow or sluggish lift, jerky movement during loading, visible oil on the cylinder rod, pooling oil under the jack, or complete loss of lift pressure. Replace the seals promptly to prevent internal cylinder damage.

Q: Does the 00591-31556-81 have a cross-reference part number from other manufacturers?
A: No cross-reference part numbers have been published for the 00591-31556-81. This is a Toyota OEM part for their specific main lift cylinder design. Always specify the exact SKU when ordering to ensure proper fit.