Part number 858-002 is a lock washer designed to prevent nuts and bolts from loosening due to vibration on compatible Hydra, PowrLiner, PowrTex, and PowrTwin equipment. This split‑ring washer creates tension that resists rotational loosening, maintaining clamping force on critical fasteners. Replacing worn, crushed, or missing lock washers ensures that assembled components remain securely fastened, reducing the risk of mechanical failure and unsafe operation.
| Part Number | 858-002 |
|---|---|
| Part Description | Lock Washer |
| Brand | Hydra / PowrLiner / PowrTex / PowrTwin |
| Fits | Hydra: Hydra M, Hydra Pro Super; PowrLiner: 3000, 3500s (Suffixed Unit), 2850, 3500 72v (Honda GXE), 3500 72v, 4500, 5500, 4955, 6955, 8955, 550, 28000, 3100, 1800M, 2800M, 4000, 4900, 4900 XLT, 5000, 6000, 6900 XLT, 6900 XLT SP, 800, 4950, 8900 XLT, 8900 XLT SP, 8900, 6950; PowrTex: 15:1, 6900SF, 12000SV; PowrTwin: 12000 GHD, 12000 XLT DI, 12000 XLT, 12000 GH, 12000 Plus DI, 4500, 3500 50th Anniversary, 4900 XLT, 4900 GH, 6900 XLT DI, 4900, 6900, 8900, 12000 Plus, 6900 XLT, 12000 Plus DI, TM 8900 XLT, 8900 GH, 6900 GH |
| Condition | New |
The 858-002 Lock Washer is a simple yet essential fastener component used in various assemblies across compatible Hydra, PowrLiner, PowrTex, and PowrTwin equipment. Installed under the head of a bolt or under a nut, it provides spring tension that resists loosening caused by vibration, thermal cycling, or dynamic loads.
Over time, lock washers can lose their temper, become flattened, or corrode, reducing their ability to maintain clamping force. A missing or ineffective lock washer may allow fasteners to back out, leading to component misalignment, fluid leaks, or mechanical failure. Replacing them during service restores the integrity of bolted connections and ensures safe, reliable operation.
| Vibration resistance | Prevents fasteners from loosening under dynamic loads |
|---|---|
| Clamping force maintenance | Provides spring tension to keep bolted joints tight |
| Load distribution | Helps distribute clamping load evenly under the fastener head |
| Flattening / loss of tension | Washer no longer has a visible gap or spring action |
|---|---|
| Corrosion / rust | Heavy corrosion that compromises material integrity |
| Cracking / breakage | Visible cracks or pieces missing |
| During disassembly | Always replace lock washers when servicing bolted joints |
Part number 858-002 is compatible with the following equipment models. Always confirm fitment using the correct parts diagram for your exact model and serial number.
| Brand / Series | Model | Component |
|---|---|---|
| Hydra | Hydra M | Lock Washer |
| Hydra Pro Super | Lock Washer | |
| PowrLiner | 3000 | Lock Washer |
| 3500s (Suffixed Unit) | Lock Washer | |
| 2850 | Lock Washer | |
| 3500 72v (Honda GXE) | Lock Washer | |
| 3500 72v | Lock Washer | |
| 4500 | Lock Washer | |
| 5500 | Lock Washer | |
| 4955 | Lock Washer | |
| 6955 | Lock Washer | |
| 8955 | Lock Washer | |
| 550 | Lock Washer | |
| 28000 | Lock Washer | |
| 3100 | Lock Washer | |
| 1800M | Lock Washer | |
| 2800M | Lock Washer | |
| 4000 | Lock Washer | |
| 4900 | Lock Washer | |
| 4900 XLT | Lock Washer | |
| 5000 | Lock Washer | |
| 6000 | Lock Washer | |
| 6900 XLT | Lock Washer | |
| 6900 XLT SP | Lock Washer | |
| 800 | Lock Washer | |
| 4950 | Lock Washer | |
| 8900 XLT | Lock Washer | |
| 8900 XLT SP | Lock Washer | |
| 8900 | Lock Washer | |
| 6950 | Lock Washer | |
| PowrTex | 15:1 | Lock Washer |
| 6900SF | Lock Washer | |
| 12000SV | Lock Washer | |
| PowrTwin | 12000 GHD | Lock Washer |
| 12000 XLT DI | Lock Washer | |
| 12000 XLT | Lock Washer | |
| 12000 GH | Lock Washer | |
| 12000 Plus DI | Lock Washer | |
| 4500 | Lock Washer | |
| 3500 50th Anniversary | Lock Washer | |
| 4900 XLT | Lock Washer | |
| 4900 GH | Lock Washer | |
| 6900 XLT DI | Lock Washer | |
| 4900 | Lock Washer | |
| 6900 | Lock Washer | |
| 8900 | Lock Washer | |
| 12000 Plus | Lock Washer | |
| 6900 XLT | Lock Washer | |
| 12000 Plus DI | Lock Washer | |
| TM 8900 XLT | Lock Washer | |
| 8900 GH | Lock Washer | |
| 6900 GH | Lock Washer |
Lock washers are typically replaced alongside other fastener hardware. When servicing, these components are commonly inspected or replaced at the same time.
Check threads for damage or stretching; replace if worn.
Used in conjunction with lock washers; inspect for deformation.
Ensure mating surfaces are clean and undamaged for proper clamping.
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