Symptoms
- Trimmer chews or jams branches instead of cutting
- Blades move but leave ragged cuts
- Visible gap or bend in the blade teeth
- Increased vibration while cutting
Likely causes
- CommonDull bladesBlades lose their edge with regular use and need sharpening.
- CommonBent or damaged teethHitting a hard branch or fence wire can bend individual teeth.
- CommonSap and resin buildupSticky residue on blades increases friction and reduces cutting ability.
- PossibleLoose blade boltsLoose hardware lets blades separate slightly, reducing shear.
- PossibleTrying to cut branches too thick for the toolHedge trimmers are designed for smaller stems, not thick branches.
What to do
- Remove the battery or disconnect the spark plug before touching the blades.
- Clean sap and debris off the blades with a brush and a bit of solvent or soapy water.
- Inspect the teeth for bends or chips and straighten minor bends carefully with pliers if possible.
- Sharpen the blade edges with a flat file, following the existing bevel angle.
- Check and tighten any loose blade mounting bolts.
- Lightly oil the blades after cleaning to reduce friction and prevent rust.
- If teeth are badly damaged, replace the blade assembly rather than trying to repair it.
Tools and parts
- Flat file
- Pliers
- Cleaning brush
- Light machine oil
Hedge trimmer blade assemblySearch: “hedge trimmer replacement blade”
When to call a pro
If the blades are badly warped or the gearbox is damaged, a repair shop can replace the blade assembly.
Safety
Use caution
Always remove the battery or spark plug wire and wear cut-resistant gloves before touching the blades.