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crwdns2933797:0Dave Empsoncrwdnd2933797:0crwdne2933797:0
crwdns2936043:0crwdne2936043:0 crwdns2933505:0crwdne2933505:0 Dave Empson
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| [title] Extracting motor from hedge trimmer | |
| [* black] To gain access to the electric motor, split the plastic casing of the hedge trimmer. The casing halves are often screwed together with a dozen or more screws with some hidden screws under the handles and trims. | |
| [* black] To get better access to the electric motor, remove the mains cable fastener, and pull out the electrical wires and components (switch, capacitor etc) which reside in the casing compartments. You can unscrew the the bearing housing (4 screws) and knock it off the bearing at the fan end, if required. | |
| [* black] The extracted motor and its wiring are shown in the first image, with the plastic carbon brush housings highlighted with red arrows. One screw holds the brush housing in place (removed in image). Often there are two adjacent screw holes, but I think the unused hole is a backup in case the thread is damaged in the first hole. | |
| - | [* black] With the above screw removed, the brush housings can be eased out (note location for reassembly ie the blue wired housing is adjacent to the red wire. |
| - | [* black] With the |
| + | [* black] With the above screw removed, the brush housings can be eased out (note location for reassembly ie the blue wired brush housing is adjacent to the red wire. |
| + | [* black] With the brush housing removed, inspect the commutator. It may be slightly blackened or damaged (green arrow in second image). This can be gently cleaned as required eg using a pencil eraser or a fine 1200 grit abrasive paper. (Blow out any abrasive grit and carbon dust, especially away from the bearings at either end of the rotor shaft). |
| [* black] The third image, shows a cleaned commutator which is now copper coloured, but still shows slight damage to one of the commutator contacts, but hopefully this damage should not be a problem, other than possibly wearing down the new brushes slightly faster. |