Product Description
Jet PT2748A-021 hydraulic backup ring designed for Model A, L, and J manual pallet jack pump assemblies. Seal system component installed at position 21 between dust seal and O-ring in ram piston hydraulic unit. Compatible with Jet manual material handling equipment requiring precision seal support components.
Compatibility: Fits pallet jacks made by Jet, model AJL. SKU: JT PT2748A-021
Specifications
Part Numbers
| Manufacturer Part Number | PT2748A-021 |
| Item Number Assignment | Position 21 in hydraulic assembly sequence |
Frequently Asked Questions
Q: What is the JT PT2748A-021 backup ring and what does it do?
A: The JT PT2748A-021 is a hydraulic backup ring designed for Jet manual pallet jack pump assemblies. It is installed at position 21 in the ram piston hydraulic unit, located between the dust seal and O-ring. The backup ring prevents seal extrusion under hydraulic pressure.
Q: Which Jet pallet jack models are compatible with this backup ring?
A: The JT PT2748A-021 fits Jet Model A, L, and J series manual pallet jacks, including Jet model AJL. Verify your equipment model and pump assembly before ordering to confirm fitment.
Q: How does the JT PT2748A-021 work with other seal components?
A: This backup ring is part of the hydraulic seal stack. It sits between the dust seal and the O-ring (JT PT2748A-022), providing structural support and preventing the O-ring from deforming or extruding under the pressure cycles of the pump assembly.
Q: When should the JT PT2748A-021 be replaced?
A: Replace the backup ring if the pump exhibits hydraulic leakage, fails to build pressure, or if the seal stack components show visible damage during inspection. Damaged backup rings cannot provide proper extrusion protection.