Part 858-603 is a jam nut used to secure adjustable components on a wide range of PowrLiner, ProMark, and PowrDrive airless sprayers and line stripers. It provides a reliable lock to prevent loosening under vibration and maintains precise settings.
| Part Number | 858-603 |
|---|---|
| Part Description | Jam Nut |
| Brand | ProMark II / PowrLiner / PowrDrive |
| Fits |
|
| Condition | New |
The 858-603 Jam Nut is a precision‑threaded fastener used to lock adjustable components such as pressure controls, guide rollers, and linkage assemblies on a wide range of PowrLiner, ProMark, and PowrDrive equipment. Its thin profile allows it to be used where space is limited, providing a secure lock against vibration‑induced loosening.
A missing, damaged, or worn jam nut can lead to component drift, improper settings, or premature wear of connected parts. Replacing a compromised jam nut with this genuine part restores reliable locking force and maintains proper adjustment.
| Locks adjustments | Secures a threaded component against the item it adjusts, preventing movement under vibration |
|---|---|
| Maintains calibration | Preserves precise settings for pressure, alignment, or tension |
| Space‑saving design | Thin profile allows use in confined areas where standard nuts would not fit |
| Missing nut | Nut is lost during disassembly or not present |
|---|---|
| Stripped threads | Threads are damaged and nut will not tighten securely |
| Corrosion / damage | Rust or physical damage that compromises locking ability |
| Component drift | Adjusted parts move out of position during operation |
Part 858-603 is compatible with the following models. Always verify fitment using the correct parts diagram for your specific equipment revision.
| Model | Component |
|---|---|
| ProMark II (Model No 759-2010) | Jam Nut |
| PowrLiner 8900 | Jam Nut |
| PowrLiner 8900 XLT | Jam Nut |
| PowrLiner 8900 XLT SP | Jam Nut |
| PowrLiner 6950 | Jam Nut |
| PowrLiner 6900 XLT | Jam Nut |
| PowrLiner 6900 XLT SP | Jam Nut |
| PowrLiner 6000 | Jam Nut |
| PowrLiner 5000 | Jam Nut |
| PowrLiner 4950 | Jam Nut |
| PowrLiner 4900 | Jam Nut |
| PowrLiner 4900XLT | Jam Nut |
| PowrLiner 4000 | Jam Nut |
| PowrLiner 3100 | Jam Nut |
| PowrLiner 2800 | Jam Nut |
| PowrLiner 1800M | Jam Nut |
| PowrLiner 2800M | Jam Nut |
| PowrLiner 800 | Jam Nut |
| PowrDrive (Model No 759-135) | Jam Nut |
| PowrLiner 4500 | Jam Nut |
| PowrLiner 2850 | Jam Nut |
| PowrLiner 550 | Jam Nut |
| PowrLiner 5500 | Jam Nut |
| PowrLiner 4955 | Jam Nut |
| PowrLiner 6955 | Jam Nut |
| PowrLiner 8955 | Jam Nut |
| PowrLiner 3500 72v | Jam Nut |
| PowrLiner 3000 | Jam Nut |
| PowrLiner 3500s | Jam Nut |
When replacing a jam nut, these components are often inspected or replaced to ensure proper adjustment and locking.
Inspect for damaged threads; clean or replace if necessary to ensure secure fastening.
The component the jam nut secures (e.g., pressure control, roller bracket) should be inspected for wear.
Consider using a new lock washer or thread‑locking compound to prevent future loosening.
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