WW PM-26P

Frequently Asked Questions

Q: What is the WW PM-26P O-ring made of and what are its pressure specifications?
A: The WW PM-26P is a nitrile rubber (Buna-N) static seal manufactured to ASTM D2000 standard with a Shore A hardness of 70 ±5. It is rated for hydraulic system pressures to 3000 PSI and is designed for the pump piston bore in Dayton manual pallet jack hydraulic units.

Q: Which pallet jack models does the WW PM-26P O-ring fit?
A: The WW PM-26P is compatible with Dayton manual pallet jacks using hydraulic units, specifically Dayton model 3KR84. Before ordering, confirm your equipment model and verify that the O-ring bore diameter matches your hydraulic pump assembly.

Q: What is the difference between a static O-ring seal and a dynamic seal in hydraulic systems?
A: The WW PM-26P is specified as a static seal, meaning it does not move during operation. It seals the pump piston bore and remains fixed in place. Static seals typically last longer than dynamic seals because they do not experience wear from motion, but they must match the exact bore diameter of your pump unit.

Q: How do I know if the WW PM-26P O-ring needs replacement?
A: Replace the WW PM-26P if you observe hydraulic fluid leaks from the pump area, reduced pump pressure, spongy or inconsistent lift action, or if the seal shows visible cracks, hardening, or swelling. Nitrile rubber seals typically last 3 to 5 years under normal operating conditions, but harsh temperature swings or contaminated hydraulic fluid accelerate degradation.

Q: Can I use the WW PM-26P O-ring in a different brand of pallet jack?
A: The WW PM-26P is specified for Dayton 3KR84 models. If your pallet jack is a different brand or model, do not assume cross-compatibility. Verify the pump bore diameter, O-ring groove dimensions, and pressure rating match your equipment specifications. Using an incorrectly sized seal can cause hydraulic leaks and equipment failure.