Product Description
Technical specification for GW 525-A hydraulic seal kit for manual pallet jack pump assemblies. Includes cross-reference part numbers GP 525-A, GP525-A. Comprised of piston, rod, and wiper seals fabricated from NBR, FKM, PU, PTFE, and phenolic tape, suitable for 3000 PSI hydraulic systems and compatible with manual pallet jack models using GW 525-A series hydraulic units.
Specifications
Compatibility
| Supersedes | Replaces older GW 525, GP 525 pump seal kits |
Hydraulic
| Maximum Hydraulic System Pressure | 3000 PSI (207 bar) |
| Operating Fluid Compatibility | Mineral oil hydraulic fluid ISO VG 32–46 |
Material
| Seal Materials | Nitrile rubber (NBR), polyurethane (PU), fluorocarbon (FKM), PTFE, phenolic fabric |
Part Numbers
| Manufacturer Part Number | GW 525-A |
| Cross-Reference Part Numbers | GP 525-A, GP525-A |
| OEM Part Number | GW 525-A |
| Equivalent Part Numbers | GP 525-A, GP525-A |
Frequently Asked Questions
Q: What are the cross-reference part numbers for GW 525-A?
A: GW 525-A has two direct cross-references: GP 525-A and GP525-A. All three part numbers supply identical piston, rod, and wiper seals with the same material composition and seal cavity dimensions. If your source lists any of these three numbers, you are ordering the same product. Always verify the exact part number with your supplier to avoid receiving incorrect seals.
Q: What materials are used in GW 525-A seals?
A: GW 525-A seals are manufactured from multiple materials selected for specific functions: NBR (nitrile rubber) for general O-rings, FKM (fluorocarbon) for high-temperature resistance, PU (polyurethane) for main sealing surfaces, PTFE (polytetrafluoroethylene) for low-friction applications, and phenolic tape for backing rings. This multi-material approach ensures reliable performance across the full range of manual pallet jack pump operating conditions.
Q: Is GW 525-A rated for 3000 PSI systems?
A: Yes. GW 525-A seals are rated for hydraulic systems with a maximum operating pressure of 3000 PSI. This covers all standard manual pallet jack pump assemblies. Do not use GW 525-A in high-pressure industrial applications exceeding 3000 PSI, as seal materials may degrade and leak.
Q: How do I install GW 525-A seals without damaging them?
A: Completely disassemble the pump housing and piston rod. Clean all seal cavities with a lint-free cloth to remove old seal debris and contamination. Apply a light coat of clean hydraulic oil to new seals before installation. Install piston seals first, then rod seals, then wiper seals in the order specified by your pump manual. Use a seal installation tool or plastic sleeve to prevent the seals from twisting or rolling during assembly. Do not force seals into place, as this can cut the material.
Q: What symptoms indicate GW 525-A seals are failing?
A: Failing seals cause slow pump response, reduced lift height, jerky or uneven pressure, visible oil leaks from the pump body or rod, and a soft or spongy pump handle. If you observe any of these symptoms after a recent overhaul, the seals may have been installed incorrectly or one seal may be defective. Disassemble and reinstall seals in the correct order, or request replacement seals if materials are damaged.
