Part 755-166 is a replacement upper packing assembly for compatible PowrLiner, ProMark II, and RentSpar equipment. This assembly contains the seals and packings that seal the upper portion of a pump or cylinder, preventing fluid leaks and maintaining pressure. When the original packings become worn, replacement restores proper sealing and performance.
| Part Number | 755-166 |
|---|---|
| Part Description | Upper Packing Assembly |
| Brand | Universal |
| Fits | PowrLiner 2800; ProMark II; RentSpar 700 |
| Condition | New |
The 755-166 upper packing assembly is a direct replacement seal component for PowrLiner 2800, ProMark II, and RentSpar 700 equipment. This assembly contains the specialized seals and packings that seal the upper end of a pump cylinder or hydraulic actuator. These packings create a dynamic seal around the piston rod or plunger, preventing fluid from escaping during the pressure stroke while allowing smooth reciprocating motion. A properly functioning upper packing assembly is essential for maintaining system pressure, preventing external leaks, and ensuring efficient operation. Worn or damaged packings can cause fluid leaks, loss of pressure, contamination of the work area, and reduced performance. This replacement assembly is manufactured as a complete unit, ensuring proper fit and eliminating the need to source individual seal components. It includes all necessary seals, backup rings, and wipers. Installation requires disassembly of the component, careful cleaning, and proper seating of the new packing assembly. Regular inspection helps identify packing wear before it leads to failure.
| Rod / plunger sealing | Prevents fluid leaks around moving rod |
|---|---|
| Pressure retention | Maintains system pressure during stroke |
| Contamination exclusion | Wipers keep debris out of cylinder |
| Fluid leakage | Visible fluid escaping from top of component |
|---|---|
| Loss of pressure | System cannot maintain set pressure |
| Worn packings | Visible wear, hardening, or damage |
| Contamination ingress | Dirt found inside cylinder |
Upper packing assembly 755-166 is compatible with the following models. Verify fit using your equipment's parts diagram.
| Compatible Models |
|---|
| PowrLiner 2800 |
| ProMark II |
| RentSpar 700 |
When replacing the upper packing assembly, inspect these associated components to ensure proper system function.
Check for scoring or wear.
Inspect for damage or wear.
Consider replacing both ends simultaneously.
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