143-500 is a major fluid section service kit containing all wear parts needed to completely rebuild the pump on compatible PowrLiner and PowrTwin airless sprayers. It restores pressure, priming ability, and sealing integrity after pump failure or as part of scheduled maintenance.
| Part Number | 143-500 |
|---|---|
| Part Description | Fluid Section Service Kit Major |
| Brand | PowrLiner / PowrTwin |
| Fits | PowrLiner 4955, 6955, 8955, 6000, 6900XLT, 4950, 6950; PowrTwin 6900 XLT, 4900, 6900, 8900, 12000Plus, 6900GH |
| Condition | New |
The 143-500 Fluid Section Service Kit Major is a comprehensive OEM rebuild kit containing all wear‑prone components required to restore the pump on compatible PowrLiner and PowrTwin airless sprayers. This kit is designed for a complete fluid section overhaul, addressing loss of pressure, poor priming, erratic spray, and external leaks.
Over time, piston packings harden, O‑rings crack, valve seats wear, and pressure rings lose their shape. A minor repair (replacing only packings) may provide short‑term relief, but a major kit replaces every sealing and wear component in the fluid section. Using the 143‑500 ensures the pump performs like new and extends the time between subsequent rebuilds.
| Complete pump rebuild | Replaces all packings, rings, seals, and valves in one kit |
|---|---|
| Restores performance | Eliminates pressure loss, priming issues, and leaks |
| Extends service life | Properly rebuilt pump lasts longer between overhauls |
| Loss of pressure | Pump won't reach or maintain operating pressure |
|---|---|
| Hard starting / no prime | Pump runs but won't draw paint or build pressure |
| Leaking packings | Paint leaking from weep hole or around piston rod |
| Preventative maintenance | Scheduled rebuild after hours of use or seasonal storage |
Part 143-500 is compatible with the following PowrLiner and PowrTwin models. Always verify with your machine's parts diagram before ordering.
| Brand / Model | Component |
|---|---|
| PowrLiner 4955 | Major fluid section service kit |
| PowrLiner 6955 | Major fluid section service kit |
| PowrLiner 8955 | Major fluid section service kit |
| PowrLiner 6000 | Major fluid section service kit |
| PowrLiner 6900XLT | Major fluid section service kit |
| PowrLiner 4950 | Major fluid section service kit |
| PowrLiner 6950 | Major fluid section service kit |
| PowrTwin 6900 XLT | Major fluid section service kit |
| PowrTwin 4900 | Major fluid section service kit |
| PowrTwin 6900 | Major fluid section service kit |
| PowrTwin 8900 | Major fluid section service kit |
| PowrTwin 12000Plus | Major fluid section service kit |
| PowrTwin 6900GH | Major fluid section service kit |
When using the major service kit, these related components are often inspected or replaced at the same time.
A scored or bent rod will damage new packings. Inspect and replace if worn.
Check the bore for scoring or out‑of‑round condition.
Inspect for wear that could cause side loading on the piston.
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