Product Description
The BI 52003643 is a direct replacement U-cup hydraulic seal for Bishamon BS-55 series manual pallet jack hydraulic units. This piston seal (component #49) is installed in the pump cylinder to maintain hydraulic pressure and prevent fluid leakage during lifting operations. Engineered elastomer construction ensures reliable performance with ISO hydraulic fluids. Essential for maintaining pump efficiency and load-holding capability in Bishamon BS-55 hydraulic systems.
Specifications
Part Numbers
| OEM Part Number | BI 52003643 |
| Manufacturer Part Number | 52003643 |
| Applicable Model | Bishamon BS-55 Hydraulic Unit |
Frequently Asked Questions
Q: What is the BI 52003643 U-cup seal and where is it located?
A: The BI 52003643 is an OEM U-cup piston seal designed for Bishamon BS-55 hydraulic pump cylinders. This seal is component number 49 in the factory diagram and mounts inside the pump cylinder to create a seal between the piston and cylinder wall.
Q: Is the BI 52003643 compatible with other Bishamon pallet jack models?
A: The BI 52003643 is specifically engineered for Bishamon BS-55 series hydraulic units (alternate designations: BS55, BS 55). Cross-compatibility with other models has not been verified. Confirm your hydraulic unit matches BS-55 specifications before ordering.
Q: What material is the BI 52003643 seal made from?
A: The BI 52003643 is constructed from engineered elastomer material formulated to withstand repeated compression cycles and exposure to ISO hydraulic fluid. The U-cup design provides superior sealing performance compared to simpler seal profiles.
Q: How long does the BI 52003643 seal typically last?
A: Under normal manual pallet jack use, the BI 52003643 seal typically performs reliably for 3-7 years. Lifespan depends on load cycling frequency, storage temperature, and hydraulic fluid condition. Regular fluid changes extend seal life.
Q: What symptoms indicate the BI 52003643 seal is failing?
A: Signs of BI 52003643 failure include persistent hydraulic fluid leakage from the pump cylinder, difficulty raising the load, pump pressure loss, or slow descent. When combined with visible wetness around the pump body, seal replacement is necessary.
Q: Is the BI 52003643 included in Bishamon seal kits?
A: Yes, the BI 52003643 is a standard component in Bishamon BS-55 factory seal kits. If replacing seals as a complete set, verify that kit includes this piston seal specification.