Part 756-078 is a replacement 5/8-18 castle nut for compatible HVLP and PowrLiner equipment. This nut features slots for a cotter pin, providing secure fastening on shafts and spindles. When the original nut becomes damaged, stripped, or lost, replacement restores proper component retention.
| Part Number | 756-078 |
|---|---|
| Part Description | Castle Nut 5/8-18 |
| Brand | Universal |
| Fits | HVLP Airspray Profinish TS40 TS 50; PowrLiner 3000, 3500s (suffixed unit); PowrLiner 3000, 3500s; PowrLiner 3500 72v (Honda gxe); PowrLiner 3500 72v; PowrLiner 4500 service; PowrLiner 4955, 6955, 8955; PowrLiner 1800M, 2800M; PowrLiner 2800; PowrLiner 3100; PowrLiner 4900 XLT; PowrLiner 4900; PowrLiner 4950; PowrLiner 5500; PowrLiner 6900 XLT SP; PowrLiner 6900 XLT; PowrLiner 6950; PowrLiner 6950_1; PowrLiner 8900 XLT SP; PowrLiner 8900 XLT; PowrLiner 8900 |
| Condition | New |
The 756-078 castle nut is a direct replacement fastener for HVLP Airspray Profinish TS40 TS 50 and an extensive range of PowrLiner models including 3000, 3500s (including suffixed units), 3500 72v (Honda gxe), 3500 72v, 4500 service, 4955/6955/8955, 1800M/2800M, 2800, 3100, 4900 XLT, 4900, 4950, 5500, 6900 XLT SP, 6900 XLT, 6950, 6950_1, 8900 XLT SP, 8900 XLT, and 8900. A castle nut, also known as a castellated nut, features slots cut into the top. After the nut is tightened to the correct torque, a cotter pin is inserted through one of the slots and a hole in the mating shaft to lock the nut in place, preventing it from loosening due to vibration. This type of nut is commonly used on wheel spindles, axle ends, and other critical applications where secure retention is essential. A damaged, stripped, or missing castle nut can lead to component loosening, wheel separation, or other serious failures. This replacement nut is manufactured to exact 5/8-18 thread specifications and includes the proper slot configuration. Installation requires proper torque and insertion of a new cotter pin.
| Component retention | Secures components on shafts or spindles |
|---|---|
| Vibration resistance | Cotter pin prevents loosening |
| Critical fastening | Used in safety-critical applications like wheels |
| Stripped threads | Nut will not tighten properly |
|---|---|
| Worn slots | Slots damaged, cotter pin won't secure |
| Corrosion damage | Rust has weakened nut |
| Missing nut | Nut lost during operation |
Castle nut 756-078 is compatible with the following models. Verify fit using your equipment's parts diagram.
| Compatible Models |
|---|
| HVLP Airspray Profinish TS40 TS 50 |
| PowrLiner 3000, 3500s (suffixed unit); 3000, 3500s |
| PowrLiner 3500 72v (Honda gxe); 3500 72v |
| PowrLiner 4500 service; 4955, 6955, 8955 |
| PowrLiner 1800M, 2800M; 2800; 3100 |
| PowrLiner 4900 XLT; 4900; 4950; 5500 |
| PowrLiner 6900 XLT SP; 6900 XLT; 6950; 6950_1 |
| PowrLiner 8900 XLT SP; 8900 XLT; 8900 |
When replacing the castle nut, inspect these associated components to ensure proper fastening.
Always use a new cotter pin for secure locking.
Check threads and cotter pin hole for damage.
Inspect for wear or deformation.
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