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Symptoms
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Causes
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Action
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Cartridge does not detonate (a misfire)
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- Firing pin failing to make contact with cartridge.
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- Inspect cartridge for firing pin indent.
- If no indent is visible, strip down firing assembly and check condition and operation of parts.
- If indent is visible, check position of indent and rectify if necessary.
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- Water or oil-damaged cartridges.
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- Use a new box of cartridges.
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Bolt does not return fully to the breech
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- Incomplete set of buffers and washers.
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- Check and make good, as necessary.
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- Worn washers and buffers.
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- Check and replace as necessary.
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- Build-up of carbon deposits on piston, breech and in chamber.
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- Check and remove if present.
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- Check and remove if present.
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Stunner fires, but there is insufficient power to stun the animal
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- Incorrect strength of cartridge being used.
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- Check type of cartridge against model of stunner and animals being stunned.
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- Incorrect air pressure used.
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- Choose air pressure according to manufacturer’s recommendations.
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- Incorrect positioning of stunner on animal.
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- Check correct stunning position for type of animal being stunned.
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- Bolt not returning fully to the breech after each shot.
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- Check for carbon deposits on bolt, breech or in chamber and remove if present.
- Check buffers, washers and collars for wear, replace as necessary.
- Check number of washers, buffers and collars, make good as necessary.
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Bolt sticks in animal’s head
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- Recuperator sleeves excessively worn or missing.
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- Check and replace as necessary.
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- Cutting edge of bolt narrower than shaft due to incorrect sharpening.
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- Replace bolt and sharpen by grinding the inside diameter only.
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Cartridge difficult to extract
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- Check for scored or split cartridge and if found, return stunner to manufacturer for repair
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Unusually loud detonation
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- Check for damaged breech, return to manufacturer for repair.
- Check that the correct cartridge is being used.
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