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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Dismantling a Bosch hedge trimmer
Does anyone know how to dismantle a Bosch hedge trimmer?
I have an AHS 55-26 trimmer -- a superb machine. However it stopped working the other day - dead as a dodo (and no traumas such as being dropped). I've had it 3 years; it gets pretty heavy use. Funny thing was, when I plugged it in to try it again 2 days ago, it started up fine. I went to the hedge, started cutting, and a minute later it stopped dead again (btw: the cutters are _not_ jammed). I decided that maybe the brushes need replacing, so set about taking it apart. (I have an exploded view from a spare parts dealer's site) It's looking impossible, so far, without dismantling every single component of it. And in any case I'm now stymied by a circlip which is holding the cutter assembly in place. I will ask a mate if he has circlip pliers (?), but meanwhile: has anyone here done this? Is there "an easier way" to get at the brushes (which I can almost see through the vents). It's extremely frustrating: as I said, a superb tool, rather expensive, and buggered because of (probably) a tiny electrical fault. It is almost as though Bosch build in this wastage: I had exactly the same thing happen to me on my previous trimmer, which was exactly the same model, and was also 3 years old at the time. The remedy then was to buy _this_ one :-( Cheers John |
#2
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Dismantling a Bosch hedge trimmer
On 20/07/2020 16:21, Another John wrote:
Does anyone know how to dismantle a Bosch hedge trimmer? I have an AHS 55-26 trimmer -- a superb machine. However it stopped working the other day - dead as a dodo (and no traumas such as being dropped). I've had it 3 years; it gets pretty heavy use. Funny thing was, when I plugged it in to try it again 2 days ago, it started up fine. I went to the hedge, started cutting, and a minute later it stopped dead again (btw: the cutters are _not_ jammed). I decided that maybe the brushes need replacing, so set about taking it apart. (I have an exploded view from a spare parts dealer's site) It's looking impossible, so far, without dismantling every single component of it. And in any case I'm now stymied by a circlip which is holding the cutter assembly in place. I will ask a mate if he has circlip pliers (?), but meanwhile: has anyone here done this? Is there "an easier way" to get at the brushes (which I can almost see through the vents). It's extremely frustrating: as I said, a superb tool, rather expensive, and buggered because of (probably) a tiny electrical fault. It is almost as though Bosch build in this wastage: I had exactly the same thing happen to me on my previous trimmer, which was exactly the same model, and was also 3 years old at the time. The remedy then was to buy _this_ one :-( Cheers John Friend of mine brought the power unit from his lawnmower over as it exhibited these symptoms. He had cut the cable and never noticed/... -- "Women actually are capable of being far more than the feminists will let them." |
#3
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Dismantling a Bosch hedge trimmer
The Natural Philosopher wrote:
On 20/07/2020 16:21, Another John wrote: Does anyone know how to dismantle a Bosch hedge trimmer? I have an AHS 55-26 trimmer -- a superb machine. However it stopped working the other day - dead as a dodo (and no traumas such as being dropped). I've had it 3 years; it gets pretty heavy use. Funny thing was, when I plugged it in to try it again 2 days ago, it started up fine. I went to the hedge, started cutting, and a minute later it stopped dead again (btw: the cutters are _not_ jammed). I decided that maybe the brushes need replacing, so set about taking it apart. (I have an exploded view from a spare parts dealer's site) It's looking impossible, so far, without dismantling every single component of it. And in any case I'm now stymied by a circlip which is holding the cutter assembly in place. I will ask a mate if he has circlip pliers (?), but meanwhile: has anyone here done this? Is there "an easier way" to get at the brushes (which I can almost see through the vents). It's extremely frustrating: as I said, a superb tool, rather expensive, and buggered because of (probably) a tiny electrical fault. It is almost as though Bosch build in this wastage: I had exactly the same thing happen to me on my previous trimmer, which was exactly the same model, and was also 3 years old at the time. The remedy then was to buy _this_ one :-( Cheers John Friend of mine brought the power unit from his lawnmower over as it exhibited these symptoms. He had cut the cable and never noticed/... Always worth trying the flex next to the cutter in all possible orientations as internal breaks within the flex are very common. Id certainly check that before diving inside. Tim -- Please don't feed the trolls |
#4
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Dismantling a Bosch hedge trimmer
On 20/07/2020 16:21, Another John wrote:
Does anyone know how to dismantle a Bosch hedge trimmer? I have an AHS 55-26 trimmer -- a superb machine. However it stopped working the other day - dead as a dodo (and no traumas such as being dropped). I've had it 3 years; it gets pretty heavy use. Funny thing was, when I plugged it in to try it again 2 days ago, it started up fine. I went to the hedge, started cutting, and a minute later it stopped dead again (btw: the cutters are _not_ jammed). I assume you checked the mains plug first to ensure that one of the wires has not become loose? Dismantling a Bosch hedge trimmer with circlip removed with screwdriver https://youtu.be/VgIsSnb6AiM?t=378 Possibly not your model but the construction is probably the same witn respect to the blade fixings. Reassembly of blade/circlip with a small gotcha (watch the next few minutes of) https://youtu.be/UrOhAwuDR_U?t=77 part 1 to 3 of the repair https://www.youtube.com/watch?v=K797IBvqa54 https://www.youtube.com/watch?v=VgIsSnb6AiM https://www.youtube.com/watch?v=UrOhAwuDR_U -- mailto : news {at} admac {dot} myzen {dot} co {dot} uk |
#5
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Dismantling a Bosch hedge trimmer
In article ,
alan_m wrote: On 20/07/2020 16:21, Another John wrote: Does anyone know how to dismantle a Bosch hedge trimmer? .... .... I assume you checked the mains plug first to ensure that one of the wires has not become loose? Thanks for all this Alan -- firstly, Yes: I got well used to testing all the mains supply weaknesses when my _first_ AHS55 died, 3 years ago! And thanks especially for all of these links below: I would love to know what you googled for? Because none of the keyword combinations I have used brought up anything so useful-looking as these!! Which I'm now going to look at :-) John Dismantling a Bosch hedge trimmer with circlip removed with screwdriver https://youtu.be/VgIsSnb6AiM?t=378 Possibly not your model but the construction is probably the same witn respect to the blade fixings. Reassembly of blade/circlip with a small gotcha (watch the next few minutes of) https://youtu.be/UrOhAwuDR_U?t=77 part 1 to 3 of the repair https://www.youtube.com/watch?v=K797IBvqa54 https://www.youtube.com/watch?v=VgIsSnb6AiM https://www.youtube.com/watch?v=UrOhAwuDR_U |
#6
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Dismantling a Bosch hedge trimmer
Another John wrote:
In article , alan_m wrote: On 20/07/2020 16:21, Another John wrote: Does anyone know how to dismantle a Bosch hedge trimmer? .... .... I assume you checked the mains plug first to ensure that one of the wires has not become loose? Thanks for all this Alan -- firstly, Yes: I got well used to testing all the mains supply weaknesses when my _first_ AHS55 died, 3 years ago! And thanks especially for all of these links below: I would love to know what you googled for? Because none of the keyword combinations I have used brought up anything so useful-looking as these!! Which I'm now going to look at :-) John So far, the amount of "dis-assemblage" seen in the video, does not look abnormal for a hand tool. Only on some older hand tool, might you have seen more attention paid to making servicing of a particular portion, really easy. Today, the plastic body holds all the bits and pieces in position, and so all the screws have to come out, so any one piece can be dislodged. You wouldn't expect to be able to move a motor, unless there is some slack in the wire, and to get slack means pulling wires out of their retainers. Don't forget to put the Electricians Knot back properly on its post or restraint, to prevent wire from being pulled out of the housing later. If you're unfamiliar with a tool, take a digital camera and shoot a picture on the first removal of screws. That way, if there is some "trick" involved, you'll have a high res picture for later to look at. There is usually a preferred side to lay it on, so the trigger doesn't fall out before you've had a chance to shoot a picture. I will say though, that my hedge trimmer doesn't use a circlip. I've had at least two replacement blades on it, and no brush changes. The last circlip I removed (when I replaced the push handle on the electric lawn mower a few weeks ago), I used the blunt end of my linemans pliers, and pushing on the arms of the circlip, it came off easily. I was expecting a big fight, but it didn't really resist. https://n7.nextpng.com/sticker-png/7...-thumbnail.png Circlips are a pest, when you can't get tools at them. When there's no place to work. And those will also be the circlips, that just don't want to come off. They also make circlips that can be damaged by your removal technique. Some of them don't "spring back" and end up non-planar instead. Paul |
#8
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Dismantling a Bosch hedge trimmer
OP here. "It's fixed!!" (kind of -- see below). I said:
Does anyone know how to dismantle a Bosch hedge trimmer? I have an AHS 55-26 trimmer -- a superb machine. However it stopped working the other day - dead as a dodo (and no traumas such as being dropped). I've had it 3 years; it gets pretty heavy use. Funny thing was, when I plugged it in to try it again 2 days ago, it started up fine. I went to the hedge, started cutting, and a minute later it stopped dead again (btw: the cutters are _not_ jammed). I decided that maybe the brushes need replacing, so set about taking it apart. (I have an exploded view from a spare parts dealer's site) It's looking impossible, so far, without dismantling every single component of it. And in any case I'm now stymied by a circlip which is holding the cutter assembly in place. I will ask a mate if he has circlip pliers (?), but meanwhile: has anyone here done this? Is there "an easier way" to get at the brushes (which I can almost see through the vents). It's extremely frustrating...I had exactly the same thing happen to me on my previous trimmer, which was exactly the same model, and was also 3 years old at the time. The remedy then was to buy _this_ one :-( Well: a qualified "it's fixed!!" -- through the well tried and tested method of taking the thing apart, looking at it, poking it, blowing the dust off it, shrugging in mystification, and then putting it back together. By far the biggest challenge was getting it apart; there's nothing in Google/Youtube for dismantling this particular model, although I could garner general hints from one or two of the hits that there are, for "hedgetrimmers". I have the advantage that (as explained above) I have *two* of these, the first one having packed in 3 years ago. So I used that as a potentially sacrificial trial. Today I actually, finally, managed to disassemble it. I bought some circlip pliers: they were too big (thanks to Homebase for giving me my money back, no quibbles). *Then* I discovered, through desperation, that I could get the circlip off using my Swiss Army knife. No more details about disassembly - let me know here (_not_ via email) if you want to know more. I discovered that the brushes are in fine fettle - only about 1/4 worn by the look of them (after about 3 years' hard use). So why the hell did it stop? I'm not any kind of electrical fellow, and so have no circuit testers etc. I just poked the switches that I found, and eventually decided that *maybe* the main ON switch (the big orange one in the handle) had lost its alignment with the tiny electrical switch that it bumps, when you squeeze the handle to start cutting. But hardly likely, I figured. But anyway ... I half-put it back together again (without the blade assembly, and not entirely screwed up), and squeezed the handle: for the first time in 3 years, it burst into life. What's more, once I'd put it all together properly, it *still* works. The biggest win here is not so much that it works again, but that I now know how to take one of these apart, and with confidence. I hope this was of some interest to one or two! Cheers John |
#9
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Dismantling a Bosch hedge trimmer
On Fri, 24 Jul 2020 20:54:46 +0100, Another John wrote:
I just poked the switches that I found, and eventually decided that *maybe* the main ON switch (the big orange one in the handle) had lost its alignment with the tiny electrical switch that it bumps, when you squeeze the handle to start cutting. But hardly likely, I figured. But anyway ... Not that uncommon. Trouble is often the cause of a misalignment is due to some small bit plastic guide that has bust and is impossible to repair. It'll work for a while then get out of alignment again and stop. If you're out of luck it means a disassembly to realign, with luck it's s just a fiddle of the part. I half-put it back together again (without the blade assembly, and not entirely screwed up), and squeezed the handle: for the first time in 3 years, it burst into life. What's more, once I'd put it all together properly, it *still* works. Always a bounus! The biggest win here is not so much that it works again, but that I now know how to take one of these apart, and with confidence. And you can now fix the one that you bought three years ago when the one you just fixed stopped working. -- Cheers Dave. |
#10
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Dismantling a Bosch hedge trimmer
Another John wrote:
I'm not any kind of electrical fellow, and so have no circuit testers etc. I just poked the switches that I found, and eventually decided that *maybe* the main ON switch (the big orange one in the handle) had lost its alignment with the tiny electrical switch that it bumps, when you squeeze the handle to start cutting. But hardly likely, I figured. But anyway ... It can be a broken wire somewhere. There are some brush holders, where the brush holder is an intermittent. And moving the rotor of the motor a bit might wake it up. The brushes where a braided copper wire is embedded in the carbon brush, those don't do that. It's the brushes that are just a carbon block spring-loaded into a metal tube, those can be intermittent. Also look for discolored wires, or soot around switches, for hints of stress. A little stress is to be expected. Products which use "dynamic braking", and they remove power to the motor, then short out the motor to use the generator effect for braking - that forces the brushes to carry 3X the normal current flow level. Using the brake then, is in a sense, more stressful than the brushes handle during normal running. You might see more sparks fly off brush/commutator during (electrical) braking. Fast braking is used on electric lawnmowers. The hedge trimmer doesn't really need it (lots of friction). Paul |
#11
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Dismantling a Bosch hedge trimmer
On Tuesday, 21 July 2020 02:17:05 UTC+1, Paul wrote:
You wouldn't expect to be able to move a motor, unless there is some slack in the wire, and to get slack means pulling wires out of their retainers. Don't forget to put the Electricians Knot back properly on its post or restraint, to prevent wire from being pulled out of the housing later. I don't think I've ever seen an appliance that used an underwriter's knot in lieu of a proper cordgrip. And I've seen a lot of historic appliances. NT |
#12
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Dismantling a Bosch hedge trimmer
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#13
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Dismantling a Bosch hedge trimmer
On Saturday, 25 July 2020 04:02:56 UTC+1, Paul wrote:
tabbypurr wrote: On Tuesday, 21 July 2020 02:17:05 UTC+1, Paul wrote: You wouldn't expect to be able to move a motor, unless there is some slack in the wire, and to get slack means pulling wires out of their retainers. Don't forget to put the Electricians Knot back properly on its post or restraint, to prevent wire from being pulled out of the housing later. I don't think I've ever seen an appliance that used an underwriter's knot in lieu of a proper cordgrip. And I've seen a lot of historic appliances. NT My lamp in the bedroom has that knot, because I made the lamp in shop class :-) That's where we were taught to use the knot. I've got some other item here, that has a knot inside and a post it goes around. It was put there to secure something inside from moving. The underwriter's knot doesn't stop wires moving, that's why it's never used here. I gather it's something from US history where effective cordgrips have not been adopted to the same extent. NT |
#14
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Dismantling a Bosch hedge trimmer
wrote:
The underwriter's knot doesn't stop wires moving, that's why it's never used here. I gather it's something from US history where effective cordgrips have not been adopted to the same extent. NT For the lamp project, the base is solid pine, with holes provided for running the wire. And shop class had no assortment of fixings, so you basically wire up the light socket, then place a knot to prevent the cord from being pulled out (hot). If it had started as a commercial item, the fittings would be different. When you repair an electric kettle here, it already has the correct restraint on the base, and after you remove a piece of cord to get rid of the cord break, the cord is placed back inside the restraint. And the cord won't move through one of those. Something like this, for three conductor flat cord. These can be recycled, so you don't need a new one. http://heyco.com/blog/strain-relief-...s-life-easier/ Paul |
#15
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Dismantling a Bosch hedge trimmer
On Sunday, 26 July 2020 01:39:42 UTC+1, Paul wrote:
tabbypurr wrote: The underwriter's knot doesn't stop wires moving, that's why it's never used here. I gather it's something from US history where effective cordgrips have not been adopted to the same extent. NT For the lamp project, the base is solid pine, with holes provided for running the wire. And shop class had no assortment of fixings, so you basically wire up the light socket, then place a knot to prevent the cord from being pulled out (hot). If it had started as a commercial item, the fittings would be different. When you repair an electric kettle here, it already has the correct restraint on the base, and after you remove a piece of cord to get rid of the cord break, the cord is placed back inside the restraint. And the cord won't move through one of those. Something like this, for three conductor flat cord. These can be recycled, so you don't need a new one. http://heyco.com/blog/strain-relief-...s-life-easier/ Paul I'm not overly fond of those things, but they work more or less. Here when the concept of cordgrip was on its way in there were 2 types mainly used. One was to tie the strings in the flex together, the other was to put a simple knot in the whole cord. Both stopped the thing being pulled out of the appliance, but neither immobilised the wires at their connections. Nowadays it's either a screwed down plastic strip, a serpentine groove for the cord or a moulded on bushing. Less often it's those things above. All immobilise the final joints. Up to the 1950s there were various wacky schemes that didn't work well, especially on mains plugs, but they're all long gone thankfully. The worst one I saw was an IDC mains plug: a prong on each pin pierced the unstripped mains wire, and was held together with horrifyingly low force - a fire waiting to happen. IIRC the prongs doubled as a cordgrip of sorts. NT |
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