Product Description
GW 522 Seal Kit is engineered for manual pallet jack hydraulic units, featuring nitrile rubber and PTFE seals to ensure reliable sealing in high-pressure applications up to 3000 PSI. The kit includes U-cup seals, wiper seals, O-rings, and guide tapes compatible with GP 522 and GP522 assembly configurations.
Specifications
Hydraulic
| Rated System Pressure | 3000 PSI maximum hydraulic service |
| Applicable Fluid | Mineral-based hydraulic oil, ISO 32/46 viscosity range |
Material
| Seal Material | Nitrile rubber (NBR), FKM (fluoroelastomer), PTFE for back-up rings |
| Guide Tape Material | Phenolic resin-based fabric |
Part Numbers
| Manufacturer Part Number | GW 522 |
| Cross-Reference Part Numbers | Equivalent to GP 522, GP522; No additional cross-reference part numbers available |
Frequently Asked Questions
Q: Is GW 522 equivalent to GP 522 or GP522?
A: Yes. GW 522 is the current OEM-equivalent replacement for both GP 522 and GP522 seal kits. All three part numbers provide identical sealing geometry and material specifications. When ordering, specify GW 522 as the current superseding part number for clarity.
Q: What components are in the GW 522 seal kit?
A: GW 522 includes four seal classes: U-cup seals (primary hydraulic piston seals), wiper seals (dust and contamination exclusion), O-rings (secondary pressure retention), and guide tapes (wear reduction on rod surfaces). All are constructed from nitrile rubber (NBR), FKM fluoroelastomer, or PTFE as appropriate for their sealing function.
Q: What hydraulic systems is GW 522 rated for?
A: GW 522 is engineered for manual pallet jack hydraulic units rated at 3000 PSI maximum service pressure. Do not use in systems exceeding 3000 PSI; seal materials will degrade, leading to leakage and complete pump failure. Verify your jacks pressure rating on the specification plate before installation.
Q: What are the warning signs that GW 522 seals need replacement?
A: Primary indicators include weak pump pressure (load lifts slowly or not at all), visible hydraulic fluid leaking from pump cylinder or rod areas, grinding or sticking during pump strokes, and cloudy or burnt-smelling hydraulic fluid. If your jack is more than 3 to 4 years old and shows any of these symptoms, plan seal replacement immediately.
Q: Can I install GW 522 in the field, or do I need a technician?
A: GW 522 installation is not a plug-and-play task. The hydraulic cylinder must be removed from the jack, drained completely, disassembled, and the bore cleaned and inspected for damage. U-cup and wiper seals must be installed with precise orientation (lip direction is critical). Guide tape application requires proper technique. Unless you have hydraulic service training, contract a certified technician to avoid bore damage and seal inversion.
Q: How long do GW 522 seals last under normal use?
A: Under routine warehouse pallet jack operation, GW 522 seals provide reliable service for 3 to 5 years. Lifespan is extended by maintaining clean hydraulic fluid (change filters every 500 hours), keeping fluid temperature below 60 degrees Celsius, and avoiding overload conditions. Contaminated or degraded hydraulic oil will reduce seal life to 1 to 2 years.
