Product Description
The PU AA-07.3 is a direct-replacement U-Cup hydraulic seal designed for manual pallet jack hydraulic systems. This elastomeric seal provides reliable directional sealing in rod and piston applications, ensuring consistent pressure holding and fluid containment in hydraulic cylinders. Compatible with Pallet Mule AA-series pallet jacks, this U-Cup resists wear under dynamic motion and maintains flexibility across temperature ranges. Use for maintenance and repair of hydraulic lift systems in warehouse and dock operations.
Specifications
Product Overview
| Part Number | PU AA-07.3 |
| Product Type | U-Cup Hydraulic Seal |
Physical Specifications
| Material | Elastomer |
| Seal Type | U-shaped directional seal |
| Function | Dynamic and static pressure sealing |
Compatibility
| Application | Rod and piston hydraulic cylinders |
| Compatible Equipment | Pallet Mule manual pallet jacks |
Frequently Asked Questions
Q: What is the PU AA-07.3 U-Cup?
A: The PU AA-07.3 is a U-Cup seal, an elastomeric sealing component used in dynamic and static hydraulic applications. The U-shaped profile provides directional sealing and is commonly used in rod or piston applications where fluid containment and pressure holding are critical.
Q: What is the difference between a U-Cup and an O-Ring?
A: An O-Ring is circular and provides radial sealing around a circumference. A U-Cup has a U-shaped cross-section and is directional, designed to seal in one direction under pressure. U-Cups are typically used for rod or piston sealing in hydraulic cylinders, while O-Rings are used for general port and cavity sealing.
Q: Which pallet jack models use the PU AA-07.3 U-Cup?
A: The PU AA-07.3 is designed for Pallet Mule manual pallet jack hydraulic systems requiring U-Cup style seals. Confirm your equipment model and hydraulic assembly type before ordering to ensure proper fit and sealing performance.
Q: What material is the PU AA-07.3 made from?
A: The PU AA-07.3 is manufactured as an elastomeric U-Cup seal. This material resists wear under dynamic motion, maintains flexibility across temperature ranges, and provides reliable pressure-holding performance in hydraulic rod and piston applications.
Q: When should I replace the PU AA-07.3 U-Cup?
A: Replace the PU AA-07.3 when hydraulic fluid leaks from the rod or piston area, the seal shows visible cracks or permanent deformation, the cylinder no longer holds pressure, or during scheduled seal kit maintenance. U-Cup seals wear faster under high-cycle use and should be inspected regularly.
Q: How does U-Cup wear affect hydraulic system performance?
A: Worn U-Cup seals allow internal fluid bypass and pressure loss, resulting in slow or no cylinder extension, inability to lift load, and external fluid leakage. Worn seals also allow hydraulic fluid to contaminate the rod area. Replace U-Cup seals promptly to restore system performance and prevent secondary damage to cylinders or pumps.
