Product Description
The VJ 55F138 is a precision-machined hardened steel valve ball seat for the Valu-Jack 5500-2 manual pallet jack hydraulic control valve assembly. This direct replacement component provides reliable seating in the hydraulic circuit, interfacing with the check ball and spring elements to maintain pressure during lift operations. Built for durability and precise tolerances in manual pallet jack hydraulic systems.
Specifications
Material & Construction
| Material Specification | Hardened steel |
| Finish/Coating | Machined, uncoated component |
Part Numbers & Compatibility
| Manufacturer Part Number | VJ 55F138 |
| Factory-Equivalent Number | 55F138 |
| Compatible Models | Valu-Jack 5500-2 Hydraulic Unit |
| Alternate Model Designations | 55002 Hydraulic Unit, 5500 2 Hydraulic Unit |
Application
| Function | Hydraulic control valve ball seat component |
| Equipment Type | Manual pallet jack hydraulic system |
Frequently Asked Questions
Q: What is the VJ 55F138 valve ball seat and where is it located?
A: The VJ 55F138 is a hardened steel valve ball seat (OEM 55F138) that is a precision-machined, uncoated component integrated into the hydraulic control valve assembly of Valu-Jack 5500-2 manual pallet jacks. It interfaces with the check ball and spring to maintain sealing in the hydraulic circuit.
Q: Which pallet jack models accept the VJ 55F138 valve ball seat?
A: The VJ 55F138 fits Valu-Jack 5500-2 Hydraulic Unit. Alternate compatible models include 55002 Hydraulic Unit and 5500-2 Hydraulic Unit designations. Confirm your hydraulic control valve assembly matches this generation before ordering.
Q: What material is the VJ 55F138 made from?
A: The VJ 55F138 is manufactured from hardened steel, machined to precision tolerances, and left uncoated. The hardening treatment provides wear resistance under repeated contact with the check ball during valve cycling. The uncoated finish maintains close tolerances required for proper sealing.
Q: When does the VJ 55F138 valve ball seat need to be replaced?
A: Replace the VJ 55F138 if the pallet jack leaks hydraulic fluid from the control valve, if pressure does not hold during a loaded lift, or if the ball seat surface is visibly pitted or scored. A damaged seat prevents the check ball from sealing properly, causing loss of lift pressure.
Q: Is the VJ 55F138 difficult to keep clean?
A: The uncoated hardened steel finish of the VJ 55F138 is prone to corrosion if exposed to moisture or salt. In wet storage or outdoor conditions, inspect the valve assembly regularly for rust. Light surface rust on the ball seat does not typically affect function, but heavy corrosion may prevent sealing.