JT PT2748J-020

Frequently Asked Questions

Q: What is the JT PT2748J-020 U-Cup pump piston seal?
A: The JT PT2748J-020 is an OEM U-Cup pump piston seal for Jet manual pallet jacks. This seal sits in the pump piston bore and maintains pressure during hydraulic fluid displacement. The U-Cup creates a dynamic seal that prevents internal leakage as the piston cycles during manual handle pump strokes.

Q: What is the difference between a pump piston seal and a lift ram seal?
A: The pump piston seal (JT PT2748J-020) operates in the pump mechanism where manual handle pressure is converted to hydraulic flow. The lift ram seal (JT PT2748J-016) operates in the lift cylinder where pressurized fluid raises and lowers the load. Both are U-Cup seals but sit in different cylinders and experience different pressure profiles. Pump seals typically see lower peak pressures but higher cycling frequency.

Q: What failure symptoms indicate a pump piston seal is degraded?
A: Failing pump piston seals cause these symptoms: manual handle becomes hard or impossible to pump, pump lever provides no pressure build-up even with full strokes, or hissing sound from pump area during lever operation. Hydraulic fluid may leak from pump seals into the manual handle area. If these occur, pump piston seal replacement is required to restore lifting function.

Q: How long do pump piston seals typically perform before replacement is needed?
A: Pump piston U-Cup seals in manual pallet jack duty cycles typically last 2 to 4 years. Pump seals degrade faster than lift ram seals because piston reciprocation creates continuous friction. Seal life shortens with contaminated hydraulic fluid, high temperature storage, or storage in cold environments below freezing. Inspect seals annually for visible corrosion on piston rod surfaces, which indicates degradation.