Product Description
VJ 6645 return spring for Valu-Jack Model 5500 and 6600 manual pallet jack hydraulic units. OEM replacement component installed in hydraulic control valve assembly between steel ball and plug. Individual service part for hydraulic pump maintenance.
Compatibility: Fits pallet jacks made by Valu-Jack, model 6600. SKU: VJ 6645
Specifications
Part Numbers & Compatibility
| OEM Part Number | VJ 6645 |
| Manufacturer Part Number | 6645 |
| Compatible Equipment Models | Valu-Jack Model 5500 and Model 6600 manual pallet jacks |
Frequently Asked Questions
Q: What is the VJ 6645 return spring and where is it used?
A: The VJ 6645 is an OEM return spring installed in the hydraulic control valve assembly between the steel ball and plug. It provides spring tension to reset the pump valve after each lowering cycle and maintains system balance.
Q: Which Valu-Jack models use the VJ 6645 return spring?
A: The VJ 6645 is compatible with Valu-Jack Model 5500 and Model 6600 manual pallet jacks. This spring is a critical service component for hydraulic pump maintenance on these models.
Q: What causes VJ 6645 spring failure?
A: Springs fail due to metal fatigue from repeated compression cycles, corrosion from hydraulic fluid breakdown, or loss of tension over extended service life. A weak or broken spring results in the pump not returning to neutral, causing continuous load drift or inability to fully lower.
Q: How often should the VJ 6645 spring be replaced as preventive maintenance?
A: Spring replacement is not typically scheduled as routine maintenance. Replace the VJ 6645 only when you observe symptoms such as load drift during holding, sluggish pump reset, or when disassembling the valve for other component replacement.
Q: Is the VJ 6645 sold individually or as part of an assembly?
A: The VJ 6645 is available as an individual service part for hydraulic pump maintenance. It is not bundled with other valve components, allowing you to replace only the failed spring without purchasing a complete assembly.