CapSpray / SprayTech part 9921601 is a lock washer used to secure fasteners in pump and drive assemblies on compatible sprayers. It prevents nuts and bolts from loosening due to vibration during operation. Replacing worn or damaged lock washers helps maintain proper clamping force and reduces the risk of component failure or leaks.
| Part Number | 9921601 |
|---|---|
| Part Description | Lock Washer |
| Brand | CapSpray / SprayTech |
| Fits | CapSpray AirCoat (0508074, 0508074A); SprayTech ED655 Plus |
| Condition | New |
The CapSpray / SprayTech 9921601 Lock Washer is a spring‑tempered split washer designed to prevent fasteners from loosening under vibration and dynamic loads. It is commonly used in pump mounting brackets, motor assemblies, and fluid section connections on compatible sprayers.
Over time, lock washers can lose their spring tension due to repeated compression, corrosion, or over‑torquing. A weakened or flattened washer may no longer provide adequate locking force, allowing nuts and bolts to back out. This can lead to misalignment, fluid leaks, or mechanical damage. Replacing worn lock washers restores secure fastening and helps ensure reliable sprayer operation.
| Vibration resistance | Spring action maintains tension between nut and joint, resisting loosening from machine vibration |
|---|---|
| Clamping force retention | Helps keep fasteners tight, preventing gaps and maintaining assembly integrity |
| Compensation for wear | Can take up slight slack caused by settling or thermal expansion |
| Loss of spring tension | Washer is flattened or does not spring back when compressed |
|---|---|
| Corrosion / damage | Rust, cracks, or deformation that compromises function |
| Recurring loosening | Fasteners repeatedly come loose despite proper torque |
| During overhaul | Replace as part of preventive maintenance when disassembling assemblies |
Part 9921601 is compatible with the following sprayer models. Always verify using the correct parts diagram for your exact machine.
| Brand / Model | Component |
|---|---|
| CapSpray AirCoat (0508074) | Lock Washer |
| CapSpray AirCoat (0508074A) | Lock Washer |
| SprayTech ED655 Plus | Lock Washer |
When replacing lock washers, it is good practice to inspect mating hardware to ensure a complete and reliable repair.
Check for thread damage or stretching. Replace if worn to ensure proper clamping force.
Used under the lock washer or bolt head to distribute load; replace if deformed or corroded.
Can supplement locking in high‑vibration areas; ensure compatibility with disassembly needs.
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