WW PM-22P

Frequently Asked Questions

Q: What is a U-cup and why is it critical for pallet jacks?
A: A U-cup is a hydraulic seal component that maintains pressure integrity in the lift cylinder. It prevents internal hydraulic fluid from leaking past the piston rod, which is essential for consistent lifting performance and load holding.

Q: What pallet jacks does the WW PM-22P U-cup fit?
A: The WW PM-22P is compatible with Dayton manual pallet jacks, specifically model 3KR84. This is a hydraulic seal component sized for that specific cylinder bore and rod diameter. Using incorrect U-cup sizes causes leakage and loss of lifting capacity.

Q: What are the dimensions and material of the WW PM-22P U-cup?
A: U-cups are engineered for specific rod diameters and cylinder bore sizes. The WW PM-22P is molded from nitrile or polyurethane elastomer designed to withstand hydraulic pressures, temperature fluctuations, and repeated compression cycles in warehouse service.

Q: What warning signs indicate the U-cup needs replacement?
A: Replace the U-cup if the pallet jack loses lifting capacity, the lift lowers slowly under its own weight when loaded, oil seeps from around the piston rod, or the jack becomes difficult to pump. These symptoms indicate seal failure and internal leakage.

Q: How long does a U-cup seal typically last?
A: In moderate to heavy warehouse use, U-cups typically last 3-5 years before wear becomes apparent. Lifespan depends on lift cycle frequency, load consistency, storage conditions, and contamination levels. Contaminated hydraulic fluid accelerates seal degradation.

Q: Are there equivalent U-cup part numbers from other suppliers?
A: The WW PM-22P is engineered as a replacement U-cup for Dayton model 3KR84 pallet jacks. While other suppliers may stock similar seals, dimensional and material specifications must match exactly. Always verify SKU compatibility rather than assuming equivalence.