00591-31555-81

Frequently Asked Questions

Q: What is the pressure rating and bore diameter of the 00591-31555-81 seal kit?
A: The 00591-31555-81 is rated for 3000 PSI system pressure with a 1.125 inch bore diameter. These specifications match Toyota ROL-LIFT manual pallet jack pump piston rod and hydraulic cylinder applications.

Q: What seal material and hardness are used in the 00591-31555-81?
A: This kit uses Buna-N seals at 70 Shore A hardness per ASTM D2000. The metal components are plated carbon steel to SAE J429 Grade 5, providing corrosion resistance and durability in hydraulic environments.

Q: Which Toyota manual pallet jack models are compatible with the 00591-31555-81?
A: The 00591-31555-81 is an OEM Toyota part designed for their manual pallet jack line, specifically for pump piston rod and hydraulic cylinder repair. Verify your model number and inspect bore diameter to confirm fitment before ordering.

Q: When should I replace the seal kit during maintenance?
A: Replace the seal kit when you observe slow lift speed, drift (uncontrolled descent), external leakage around the rod or cylinder, or after 2000 to 3000 hours of operation depending on duty cycle and storage conditions.

Q: What hydraulic oil compatibility does the 00591-31555-81 have?
A: Buna-N seals in this kit are compatible with standard mineral-based hydraulic oils. Do not mix oil types or introduce water into the system, as this degrades seal performance and reduces the 3000 PSI rating.