Product Description
TO 00591-76590-81 is a genuine Toyota lift cylinder seal kit engineered for main mast hydraulic cylinders in electric lift trucks. Assembled to OEM standards, this kit restores hydraulic sealing integrity to maintain rated lift performance and operational reliability. Compatible with high-pressure hydraulic systems, the kit utilizes OEM-grade polyurethane, nitrile rubber, and PTFE for maximum wear resistance and fluid compatibility.
Specifications
Part Numbers & Compatibility
| Make | Toyota |
| Model | 8FBCHU25, 8FBCU20, 8FBCU25, 8FBCU28, 8FBCU30 |
| Fluid Compatibility | Suited for ISO 32-46 hydraulic oil |
| Part Number | 00591-76590-81 |
| Manufacturer Part Number | TY00591-76590-81 |
Additional Specifications
| Seal Material | High-grade polyurethane and NBR (nitrile rubber) sealing elements |
| O-Ring Material | NBR—meets ASTM D2000 designation |
| Backup Ring Material | PTFE (polytetrafluoroethylene) |
Frequently Asked Questions
Q: What is the TO 00591-76590-81 seal kit engineered for?
A: The TO 00591-76590-81 is a main mast hydraulic cylinder seal kit for Toyota electric lift trucks. This kit restores sealing integrity to high-pressure lift cylinders, preventing hydraulic fluid leakage and maintaining rated lift force and performance during vertical mast extension and retraction.
Q: Which Toyota lift trucks is this seal kit compatible with?
A: The TO 00591-76590-81 fits Toyota electric lift trucks with main mast hydraulic cylinders. Compatibility depends on cylinder bore size and rod diameter; verify your equipment model and cylinder specifications against the parts diagram before ordering. Main mast cylinders differ from tilt and sideshifter cylinder designs.
Q: What materials are used in this seal kit?
A: The TO 00591-76590-81 uses grade polyurethane and NBR (nitrile rubber) sealing elements, with PTFE backup rings. These materials meet ASTM D2000 standards and provide maximum wear resistance and compatibility with ISO 32-46 hydraulic oil used in Toyota lift systems.
Q: How long does a seal kit typically last before replacement is needed?
A: Seal life depends on duty cycle intensity, cylinder pressure, and maintenance. Seals typically perform for 3-5 years in normal warehouse use. Reduced lift speed, fluid leakage at the cylinder rod, or inability to reach full lift height indicate worn seals requiring kit replacement to restore performance.
Q: Does this kit include all seals and backup rings for the main mast cylinder?
A: The TO 00591-76590-81 contains the complete set of seals, O-rings, and backup rings required for main mast cylinder repair. Confirm kit contents against your cylinder assembly drawing to ensure you have all needed components; some cylinders may require additional rod seals or cushion seals sold separately.
Q: What hydraulic fluid does this seal kit work with?
A: The TO 00591-76590-81 is engineered for ISO 32-46 hydraulic oil, the standard fluid used in Toyota lift truck systems. Using non-approved fluid or mixing fluid types causes seal degradation, swelling, and loss of hydraulic pressure. Always use the correct fluid specification.