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This is an authentic OEM part. The Echo lock nut (5mm) is compatible with many small engines. This item is made to resist coming loose due to vibration. Please refer to specific manual for additional repair information. A wrench is of course, helpful for making the repair. The lock nut is sold individually.
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We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
Chain tensioner was not working properly. The bolt was bent and needed to be replaced.
Craig from Yardley, Pennsylvania
| Brand | Model Number | Description |
|---|---|---|
| Echo | 99944200685 | Chainsaw - U-handle Blade Conversion Combo Kit |
| Echo | 99944200695 | Chainsaw - U-handle Blade Conversion Combo Kit |
| Echo | CS-302 | Chainsaw - Chainsaw |
| Echo | CS-302S | Chainsaw - Chainsaw |
| Echo | CS-303T | Chainsaw - 30.1cc Top Handle Chain Saw |
| Echo | CS-315 | Chainsaw - Chainsaw |
| Echo | CS-341 | Chainsaw - Chainsaw |
| Echo | CS-351VL | Chainsaw - Chainsaw |
| Echo | CS-451VL | Chainsaw - Chainsaw |
| Echo | CS-452VL | Chainsaw - Chainsaw |
| Echo | CS-601S | Chainsaw - Chainsaw |
| Echo | CS-601SVL | Chainsaw - Chainsaw |
| Echo | CS-602VL | Chainsaw - Chainsaw |
| Echo | CS-60S | Chainsaw - Chainsaw |
| Echo | CS-670 | Chainsaw - Chainsaw |
| Echo | CS-680 | Chainsaw - 66.8cc Professional Use Chain Saw |
| Echo | DHCS-2800 | Hedge Trimmer - Dhcs-2800 S/N: E81200001001 - E81200999999 |
| Echo | DHCS-3400 | Hedge Trimmer - Dhcs-3400 S/N: E81300001001 - E81300999999 |
| Echo | LHE-2475 | Edger - Lesco LHE-2475 (After S/N 002704) |
| Echo | PAS-266 | Trimmer - Gas Power Source Attachement |
| Echo | PE-2400 | Edger - Edger |
| Echo | QV-680 | Chainsaw - Quick Vent Saw |
| Echo | SRM-200AE | Trimmer - Straight Shaft Trimmer / Brushcutter |
| Echo | SRM-266S | Trimmer - Steel Drive Shaft Trimmer |
| Echo | SRM-3000 | Trimmer - Straight Shaft Trimmer / Brushcutter |
| Echo | SRM-410X | Trimmer - Trimmer |
| Echo | SRM-520ES-U | Brush Cutter - Brush Cutter |
Some of the parts we sell are eligible for mail-in rebates since we can recycle them. We will display any applicable rebates in your shopping cart. To redeem your rebate, contact Customer Service after you have received your part.
