Product Description
The VJ 55F141 is a U-Cup dynamic hydraulic seal designed for use in Valu-Jack 5500-2 hydraulic units. This critical component retains hydraulic fluid pressure and prevents internal leakage within the cylinder assembly during extend and retract cycles. The U-Cup accommodates rod motion while maintaining a tight seal under pressure, ensuring reliable pallet jack performance. As a dynamic wear item, it is recommended for periodic inspection and replacement if internal leakage, pressure loss, or fork drift-down occurs. The 55F141 pairs with complementary seals and caps for complete hydraulic system integrity.
Specifications
Product Overview
| Product Type | U-Cup Hydraulic Seal |
Physical Specifications
| Function | Dynamic hydraulic seal; prevents internal leakage and retains pressure |
| Seal Type | U-Cup (dynamic) |
| Wear Classification | Wear item; service life depends on cycle frequency and fluid contamination |
| Component Compatibility | Works with VJ 55F143 cylinder cap and VJ 55F142 O-ring seal |
Compatibility
| Compatible Equipment Make | Valu-Jack |
| Compatible Models | 5500-2 Hydraulic Unit, 55002 Hydraulic Unit, 5500 2 Hydraulic Unit |
| Application | Pallet jack hydraulic cylinder assembly |
Frequently Asked Questions
Q: What is the function of the VJ 55F141 U-Cup in the hydraulic unit?
A: The VJ 55F141 is a U-Cup hydraulic seal designed to retain fluid pressure and prevent internal leakage within the hydraulic cylinder assembly. It is a dynamic seal that accommodates rod motion during extend and retract cycles.
Q: Which Valu-Jack hydraulic units use the VJ 55F141?
A: The VJ 55F141 is compatible with Valu-Jack 5500-2 hydraulic units. Alternate designations include model 55002 Hydraulic Unit and 5500 2 Hydraulic Unit.
Q: Is the VJ 55F141 a wear item that requires periodic replacement?
A: Yes. U-Cup seals are dynamic wear items. Typical service life depends on cycle frequency and contamination levels. If the hydraulic unit develops internal leakage or reduced pressure retention, the U-Cup may need replacement.
Q: What symptoms indicate the VJ 55F141 seal is failing?
A: A failing U-Cup seal typically exhibits internal hydraulic leakage, resulting in inability to maintain lift pressure, gradual drift-down of the forks when holding load, or reduced lift speed during pump cycles.
Q: Does the VJ 55F141 work with other cylinder cap components?
A: Yes. The VJ 55F141 U-Cup is designed to pair with the VJ 55F143 cylinder cap and the VJ 55F142 O-ring seal as part of the complete Valu-Jack 5500-2 hydraulic cylinder pressure boundary.