Part 107-029 is a displacement rod designed for high‑performance airless paint sprayers and line stripers. This precision‑ground rod transmits reciprocating motion from the drive system to the piston, creating the pumping action that delivers paint at high pressure. Replacing a worn, scored, or bent displacement rod restores pumping efficiency, prevents fluid leakage, and extends the life of the packings and cylinder.
| Part Number | 107-029 |
|---|---|
| Part Description | Displacement Rod |
| Brand | PowrBeast / PowrLiner / PowrTwin / OEM Replacement |
| Fits | PowrBeast 4700, 7700, 9700; PowrLiner 4000, 4900 XLT, 4950, 4900, 6950, 4955, 6955, 8955; PowrTwin 4900, 6900, 8900, 12000 Plus, 4500, 4900 XLT |
| Condition | New |
The 107-029 Displacement Rod is a critical pump component that converts rotary motion from the drive into the reciprocating action needed to draw fluid in and push it out at high pressure. It is precisely machined and hardened to withstand the constant sliding contact with packings and the high side loads common in heavy‑duty airless applications.
Over time, the rod can become scored, worn, or bent, leading to fluid bypass, pressure loss, and eventual pump failure. A damaged displacement rod also accelerates wear on packings and cylinders. Replacing the rod with a genuine 107-029 restores original pumping efficiency, ensures consistent spray performance, and prevents costly downtime.
| Fluid displacement | Moves up and down inside the cylinder to create suction and discharge cycles |
|---|---|
| Pressure generation | Transmits drive force to the fluid, enabling high‑pressure atomization |
| Packing support | Provides a smooth, hard surface for packings to seal against |
| Scored / grooved | Visible scratches or grooves that damage packings and cause leakage |
|---|---|
| Bent / warped | Rod no longer moves straight; causes premature wear and binding |
| Fluid bypass | Paint leaks past packings or into the crankcase |
| Pressure loss | Inability to reach or maintain operating pressure despite new packings |
The 107-029 Displacement Rod is compatible with the following models. Always verify fitment with your machine’s parts diagram.
| Model | Component |
|---|---|
| PowrBeast 4700 | Displacement Rod |
| PowrBeast 7700 | Displacement Rod |
| PowrBeast 9700 | Displacement Rod |
| PowrLiner 4000 | Displacement Rod |
| PowrLiner 4900 XLT | Displacement Rod |
| PowrLiner 4950 | Displacement Rod |
| PowrLiner 4900 | Displacement Rod |
| PowrLiner 6950 | Displacement Rod |
| PowrLiner 4955 | Displacement Rod |
| PowrLiner 6955 | Displacement Rod |
| PowrLiner 8955 | Displacement Rod |
| PowrTwin 4900 | Displacement Rod |
| PowrTwin 6900 | Displacement Rod |
| PowrTwin 8900 | Displacement Rod |
| PowrTwin 12000 Plus | Displacement Rod |
| PowrTwin 4500 | Displacement Rod |
| PowrTwin 4900 XLT | Displacement Rod |
When replacing the displacement rod, it is typical to also service these associated components to ensure a complete, reliable repair.
The packings seal around the rod; they should always be replaced with the rod to prevent leaks.
Inspect the cylinder for scoring or wear; replace if the rod shows damage that could have compromised the bore.
Check the inlet and outlet valves; if the pump was struggling, valves may also need service.
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