Product Description
PU AA-04 is an OEM coil compression spring manufactured by Pallet Mule for the AA5000 and AA5500 manual pallet jack hydraulic units. It serves as the return or biasing spring within the hydraulic pump mechanism, constructed from high-tensile spring steel for internal application. Part numbers AA-04, PUAA-04, and PTAA-04 are direct cross-references. Compatible exclusively with Pallet Mule manual pallet jacks in the AA5000/AA5500 series.
Compatibility: Fits pallet jacks made by Pallet Mule, model AA5000. SKU: PU AA-04
Specifications
Material & Construction
| Material Specification | High-tensile spring steel |
Mechanical Specifications
| Compatible Unit | AA5000 and AA5500 Pallet Mule manual pallet jacks |
| Operating Mechanism | Applies return tension to piston or handle control |
Part Numbers & Compatibility
| OEM Part Number | PU AA-04 |
| Manufacturer Part Number | AA-04 |
| Alternate Part Number | PUAA-04 |
| Compatible Models | Pallet Mule AA5000 and AA5500 series |
| Cross-Reference Part Numbers | PUAA-04, AA-04, PTAA-04 |
| Supersedes / Replaces | Replaces all previous AA-04 designated springs for Pallet Mule AA5000 and AA5500 |
Frequently Asked Questions
Q: What is the PU AA-04 spring and what does it do?
A: The PU AA-04 is an OEM coil compression spring manufactured for the Pallet Mule AA5000 and AA5500 manual pallet jack hydraulic units. It functions as the return or biasing spring within the hydraulic pump mechanism.
Q: What material is the PU AA-04 made from?
A: The PU AA-04 is constructed from high-tensile spring steel for internal hydraulic pump application. This material provides durability and maintains spring force over extended use cycles.
Q: Which Pallet Mule models use the PU AA-04 spring?
A: The PU AA-04 is compatible exclusively with Pallet Mule manual pallet jacks in the AA5000 and AA5500 series. This spring is part of the pump assembly in these models.
Q: What are the cross-reference part numbers for the PU AA-04?
A: Direct cross-reference part numbers are AA-04, PUAA-04, and PTAA-04. These are equivalent OEM designations for the same spring component.
Q: How long does this spring typically last?
A: Spring lifespan depends on equipment usage frequency and operating conditions. Springs may lose tension over time or fail if exposed to extreme pressure spikes or corrosive environments. Regular maintenance of the hydraulic system helps extend component life.
Q: What symptoms indicate the spring needs replacement?
A: Loss of hydraulic pressure, inability to maintain lift height, or reduced responsiveness of the pump may indicate spring wear or failure. Have the hydraulic unit inspected if these symptoms occur.