

424-224 Arm Support is a structural component used in the gun carriage assembly on compatible PowrLiner and ProMark striping machines. This support provides reinforcement for the spray gun arm, helping maintain proper alignment and stability during line striping operations. A properly functioning arm support contributes to consistent line quality and reduces vibration. This support restores original arm stability and alignment on compatible units.
| Part Number | 424-224 |
|---|---|
| Part Description | Arm Support |
| Brand | PowrLiner / ProMark |
| Condition | New |
The 424-224 Arm Support is a structural reinforcement component designed for the gun carriage assembly on a wide range of PowrLiner and ProMark striping machines. This support bracket mounts between the main frame and the spray gun arm, providing critical stability and maintaining proper alignment of the spray gun during operation. In line striping applications, consistent gun positioning is essential for producing straight, uniform lines with clean edges. The arm support helps absorb vibration and mechanical stress that occurs during machine movement, reducing gun deflection and ensuring that the spray pattern remains correctly oriented to the intended striping path.
Over time, the arm support can become bent from impacts with obstacles, worn from vibration fatigue, or damaged during transport or storage. A compromised arm support may allow the spray gun to shift out of alignment, resulting in wavy lines, inconsistent edge definition, or uneven line width. In severe cases, a damaged support can allow excessive gun movement that affects striping accuracy and increases operator fatigue as adjustments become necessary during operation. Replacing the arm support restores proper gun carriage rigidity and alignment, allowing the striping machine to produce consistent results across long runs. This support is manufactured to original equipment specifications to ensure correct fitment and reliable structural performance on compatible models.
| Gun stability | Reinforces the gun carriage assembly to minimize vibration and deflection |
|---|---|
| Alignment maintenance | Keeps the spray gun properly positioned for consistent line placement |
| Structural integrity | Provides structural reinforcement to the arm assembly under operating stresses |
| Visible bending | Support bracket shows deformation or damage from impact or stress |
|---|---|
| Line inconsistency | Spray lines appear wavy, uneven, or misaligned during operation |
| Gun misalignment | Spray gun does not maintain proper orientation to the striping path |
| Excessive movement | Arm assembly exhibits noticeable flex or play during machine operation |
The 424-224 Arm Support is compatible with the following PowrLiner and ProMark striping machines. Always confirm fitment using the correct parts diagram for your exact model and revision.
| Model | Component |
|---|---|
| ProMark II | Arm Support |
| PowrLiner 8900 | Arm Support |
| PowrLiner 8900 XLT | Arm Support |
| PowrLiner 8900 XLT SP | Arm Support |
| PowrLiner 6950_1 | Arm Support |
| PowrLiner 6950 | Arm Support |
| PowrLiner 6900 XLT | Arm Support |
| PowrLiner 6900 XLT SP | Arm Support |
| PowrLiner 6000 | Arm Support |
| PowrLiner 5000 | Arm Support |
| PowrLiner 4950 | Arm Support |
| PowrLiner 4900 | Arm Support |
| PowrLiner 4900 XLT | Arm Support |
| PowrLiner 4000 | Arm Support |
| PowrLiner 3100 | Arm Support |
| PowrLiner 2800 | Arm Support |
| PowrLiner 800 | Arm Support |
When addressing gun carriage alignment or stability issues, these components are frequently inspected or replaced alongside the arm support.
The main carriage structure should be inspected for damage or wear that may affect arm mounting.
Bolts, washers, and fasteners may become loose or worn and should be replaced as needed.
The bracket that attaches the gun to the arm may also require inspection or replacement.