Qualcast Hover Safe 25, left out in the cold

An old hover mower avoids the great lawn in the sky.

Another email popped in to my inbox asking if I would have a look at a Qualcast Hover Safe 25 which had stopped working.  It had been working intermittently for a while before giving up the ghost and now it had thrown in the towel.  Bad news.  It had literally been kicked into the long grass.

Make and model:  Qualcast Hover Safe 25

Cost of replacement:  £40.00 (ish)

Cost of parts:  £0.00 (plus my time)

Hours spent on repair:  1 (plus testing)

Tools needed:  Basic screw drivers, multimeter, pliers, hair dryer

Sundry items: WD40, silicone spray, wet and dry sanding cloth

Repair difficulty:  4/10

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FixItWorkshop, Worthing, June’19, Qualcast Hover Safe 25.

The owner of this mower had reported that the handle mouted switch (dead-mans handle) had been a ‘bit tricky’ to use and that it didn’t always work.  These kinds of statements make me wonder what kind of life a device has had.  Judging by the rust and discolouration on the metal and plastic parts, I think this mower had been left in a shed with a leaky roof!

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The water had not been kind and the mechanism had seized.  The only thing to do was to open up the switch, clean up any moving parts, lubricate the switch with switch cleaner and lubricate the sliding plastic parts with a little silicone spray.  The small lever which actuates the main on/ off switch was also slightly bent, so after a little straightening, using a hair dryer, it was as good as new. After the switch was repaired, the lawnmower’s motor still wasn’t working.

The cable running from the switch to the motor housing appeared to be in good condition, so the only thing left was to remove the motor itself.  Removing the motor means removing the blade and 4 small screws (see photos).  Once exposed, the motor was revealed.  Power was indeed reaching the motor when the switch was operated, as confirmed with a quick dab of the multimeter.

The motor itself seemed to have little resistance when manually spun, which led me to suspect the motor brushes had worn out.  Doubting that brushes were available, I decided to remove them anyway for closer inspection.  This revealed seized motor brushes, which backed up my theory about the mower’s damp environment.  A quick bit of jiggery pokery and a clean up and the motor brushes were as good as new.  A quick clean up of the motor commutator, I refitted the brushes and the motor was ready to be refitted.

Now, this mower is not in the first flush of youth and the motor bearings were a little noisy, but after a quick spray of grease in the bearing area it sounded fine.  The mower will never be perfect, but at least it will work for a little longer, which has got to be the point, hasn’t it?

Dyson DC25 with various problems

Another Dyson dodges the dump

An email dropped into my inbox about a poorly Dyson DC25, that needed a bit of a clean up.  I said no problem, I’ll take a look.  What turned up was a vacuum cleaner that needed a bit more than a quick clean up with a J-Cloth.

Make and model:  Dyson DC25 (blue/ grey)

Cost of replacement:  £N/A, price when new £300

Cost of parts:  £6.89 (plus my time)

Hours spent on repair:  2.5 (plus testing)

Repair difficulty:  5/10

It soon became apparent, that the Dyson was quite ill.

Here’s a summary of the problems:

  1. The mains cable flex was split, exposing the internal cables risking electric shock
  2. The roller beaters would not spin
  3. Suction was limited

None of these features were useful in vacuum cleaner, so out came the screw drivers.

The mains flex damage was about 90 cms from the handle end, so rather than replacing the whole cable at about £30, I decided to shorten the one already fitted on the Dyson.  This involved removing three screws on the reverse of the handle to expose the wiring.  From there, the broken flex could be cut-out and the sound part of the flex, reattached to the Dyson’s wiring.  See below.

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The DC25 features a roller-ball, enabling the beater head to twist and turn in to tight spots on the floor.  This means that mains power must navigate the various joints and hinges on the way from the main body to the roller beaters.  A quick test revealed that the power was not getting through.  After removing one of the side covers, there was evidence of a previous repair.  One of the mains cables had broken and had then been twisted back together.  Clearly, an improvement was needed.  Using a section of repair cable, a small joint was soldered back in to place with some mains-rated heat shrink around the connection for insulation and reinforcement.  See below.

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The beater head also needed a good clean, which meant a strip-down and re-build.  All parts were cleaned, inspected and reassembled.  During that process, a small break in the beater head wiring was found, repaired and put back together.  See below.

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Finally, the machine needed a good clean up.  The main cylinder was washed, the filters washed (although I later decided to replace these) and the main seals on the vacuum system, cleaned and silicone sealed.  See below.

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During clean up, the spigot-yoke that holds the roller ball in place on one side was found to be missing.  Luckily the owner had kept this and dropped it back to me to re-fit.

This Dyson was on the brink, but with a little bit of spanner-time, it’s now ready to serve many more years.

 

 

 

 

Cold GHD hair straighteners

GHD 4.2b hair straighteners with a new fuse.

Someone got in touch with a set of GHD 4.2B hair straighteners, which wouldn’t warm up.  Not even the light would come on.

Make and model:  GHD 4.2b hair straighteners

Cost of replacement:  £85.00

Cost of parts:  £2.89 (plus my time)

Hours spent on repair:  1 (plus testing)

Repair difficulty:  5/10

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 These older hair straighteners are well supported with spare parts and their design means that, with a systematic approach and basic test gear, the fault can be identified and parts replaced, fairly easily.

The thermal fuse on these straighteners can fail, even though the heating elements and associated wiring and circuitry is just fine.  A combination of age and accidental rough handling can affect the life of the fuse, so it was the first thing I checked on these straighteners.

It was first time lucky in this case.  The fuse tested open-circuit.  To prove that the rest of the circuit was working, I made a temporary short circuit to the fuse connection and the straighteners powered up OK.

Time to order a new fuse.  Using an eBay shop (SiriusHairUK), a fuse was ordered and it arrived very quickly, great service.

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With the fuse re-fitted and the heating element re-installed the rest of the hair straighteners were ready for reassembly.  Using basic tools, the straighteners went back together well and after final testing, they were ready for use again.

Three wheels on my wagon

A kids push-along toy gets a wheel repair.

Just a short write up today.

As my own children have begun to get a little older and have become more interested in, quite frankly more interesting toys, I’ve occasionally had to repair them as they’ve suffered the odd mishap.

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FixItWorkshop, Worthing, May’19, toy 4×4.

I enjoy repairing toys and sharing the repair experience with the owner.  Looking after things and learning how stuff works from a young age will help nurture the beginnings of the engineers and scientists of tomorrow, so it’s vital that children start wielding screwdrivers as soon as they show an interest.

Through a local Worthing-based dads and children’s play group called Dad La Soul/ Don’t Believe The Hype, I’ve recently begun offering a broken toy repair surgery.  Children can bring in broken toys and together we can work out what the problems are and how to fix them.

http://www.totrockinbeats.com/dad-la-soul

This 4×4 push-along toy had suffered a road traffic incident which had left it missing one of its front wheels.  With only three wheels, it wasn’t going far.

Luckily, the axel and wheel stub were only push fitted on, so after taking the axel off, it was just a matter of applying some strong glue to the broken parts and leaving the wheel somewhere still and safe, while the glue set.

For light ABS plastic like this, I like using Gorilla glue, which seems to work well.  It won’t work for all plastic types, but it’s non-toxic and will be safe and strong for this application.

After the glue was set and dry, the wheel just simply pushed back on, ready for more ‘ragging’ around the floor.

Cost of replacement:  £any.  Cost of repair:  1 x dab of glue.

Time taken to repair:  20 minutes (plus glueing time).

Dyson DC40 missing a beat

A small repair on a Dyson DC40 leads to a big improvement.

A powerful, easy to manoeuvre vacuum cleaner, that gets into every nook and cranny.  But not this one.

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FixItWorkshop, Worthing, May’19, Dyson DC40.

Three top tips for keeping your Dyson DC40 in rude health:

  • Keep all filters clean (wash or replace frequently)
  • Clean all rubber seals with a damp cloth to remove dust build-up
  • Occasionally lubricate moving parts of jockey wheel mechanism (springs and lever) with silicone spray

Do these things and your Dyson will love you forever.

I’m a bit of a sucker for Dyson products.  They are well engineered products from the school of function over form and in my opinion, objects of art.

This Dyson wasn’t very well when it was admitted to the workshop.  The owner had complained that the vacuum cleaner wasn’t picking up dirt and dust properly.  The beaters were not spinning either.

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FixItWorkshop, Worthing, May’19, Dyson DC40 beater head.

The beater ‘head’ is attached to the main body of the vacuum cleaner and is held in place with a sliding clip.  The head can rotate and move to allow maximum control.  The beater roller is driven not via a belt from the main motor, but from its own smaller motor in the head unit.  So, there is an electrical connector between the main body and head unit.  As the beaters were not spinning, it seemed sensible to test the electrical connection.  Upon testing, it was not working.

The mechanism on this vacuum cleaner is quite complicated and relies on levers and joints working in harmony.  Dismantling the wheels, filters, brackets and covers around the motor revealed the problem.  The supply that feeds power to the beater head is routed around the motor and sliding lever mechanism and a broken cable was to blame for the beaters not spinning.

Access was difficult due to the design so rather than completely tearing down the body to replace the supply loom, I reattached the broken wire with some soldering and heat shrink to make a robust repair.

After carefully rerouting the cables and reassembling the body, wheels and beater head, the beaters spun once more.  Result.

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After a new set of filters were fitted and a light service, the machine was as good as new.

Cost of replacement machine:  £000’s.  Cost of repair parts: £11.69 plus my time and two teas.