A KitchenAid struggling to make dough!

A KitchenAid 5K45SS gets a light overhaul and a replacement worm gear assembly to restore it to its former glory.

My regular reader might gasp in horror to learn that this time on ‘Diary of a Tinkerer’, I’m writing about the opposition. What? Uh?

Yes, I’m writing about a KitchenAid stand mixer and not a Kenwood Chef for a change. Are these things all the same? Well, I guess that the model you see below does a similar job and has a wide range of accessories, making it extremely versatile, like a Chef. However, the overall package is different and while the Chef has gently evolved over 70-odd years in production, the original KitchenAid remains closer in function and form to its original design. That’s not to say that a KitchenAid bought today is the same as one bought 50 years ago, far from it. New models benefit from modern motors and modern manufacturing processes, but it’s all packaged with a retro-feel. I’m not a fan of retro-stylised items as they’re often not as good as the original. However, the KitchenAid is different as it’s truly original, well-made and not just playing at it.

KitchenAid stand mixers have been around for over 100 years and the basic design has its origins in the US with the Hobart Company. The KitchenAid brand is now owned by the Whirlpool Corporation, and current models feature robust construction and hard wearing finishes ensuring long-service. KitchenAid machines are durable, stylish and available in a wide selection of colours.

Now, I know what you’re thinking; Do I prefer the Kenwood Chef or my new American friend, the KitchenAid? Well it’s hard to say. I love the construction and the sound industrial design of older Chefs, and it must be said that recently made models have lost some of that robustness with the use of overcomplicated electronics and gimmicky LED lighting.

Over the years in production, KitchenAid machines have retained a ‘function over form’ approach and appearances have changed little. KitchenAids are simple to operate, durable and can be repaired easily. It’s an example that ‘modern Kenwood’ and other manufacturers, could learn from.

KitchenAid’s mantra is simple; Less is more, so much so, that it’s now a design classic in its own right.

Make and model: Whirlpool Corporation KitchenAid 5K45SS

Fault reported: Rough running, noisy operation

Cost of replacement machine: £500

Manufacturer support (in the UK): 6/10

Cost of parts (for this repair): £37.98 (Worm gear assembly 240309-2)

My time spent on the repair: 2 hours

Tools needed: Screw drivers, pliers, cutters, drift for planet pin

Sundry items: Food safe grease

Cleaning materials: Silicone spray, damp cloth, cleaning spirit

Repair difficulty: 4/10

Beverages: 2 X teas

Biscuits consumed: 3 X ginger nuts

This machine you see in the photos came into the workshop with a few issues. Firstly, it needed a good clean; something that machines visiting me get whether they need it or not. I always make sure that things are polished or paintwork touched-in, if possible. It’s a little bit of OCD that’s hard to shake-off. I think I want all my customers to see what’s possible with a little-workshop love!

Cleaning over, and on to the main problem. This machine had had a hard life making lots of dough, or maybe cement, and routine use day-in day-out had taken its toll on the worm pinion gear assembly. I’m sure you’ve heard of that. In Plain English, it’s the bit that transfers the movement from the motor to the bit which drives the mixer’s blender.

The machine was rough in operation and the planet wheel (where the mixer bit attaches) was intermittent. No good for dough. No good for anything.

Due to their simple construction, dismantling just involves one cross-head screwdriver and a small drift and soft hammer. Simple stuff, no Torx screws or plastic tangs to worry about here, just traditional assembly techniques, which means that the machine can be repaired many times over a long-life, without fixings becoming loose and tired.

The worm pinion gear assembly (I hope you were paying attention) is available as a complete unit with bracket and bearing or available as seperate components. On an item like this, I prefer to replace the whole assembly as parts like this wear together. It’s personal choice at the end of the day, but sometimes, it’s a false economy to replace a spare part within a spare part, as I’ve found out to my cost, during many a previous repair.

As a side point; the worm gear on this machine can be described as a sacrificial part. The motor output is made of toughened steel, the gear that drives the mixer bits is forged steel, both hard and tough. The worm gear is made from Nylon, which is hard wearing, but less so than the other moving metal parts. If the machine is overloaded, it’s the worm gear that will fail first before the other, more expensive parts. Many manufacturers do this and it’s recognised as good engineering practice.

With the gear replaced, just a couple of screws to remove and replace, together with new (top-up) grease applied and the mixer worked well, once again.

The last job on this machine was to replace the very short flex and Euro plug fitted. This particular machine had been owned by an American couple, living in Europe but were now living in England and therefore required the correct UK specification plug. Together with the correct three-core flex, this machine was ready again to earn its keep.

Time to make a pizza I think.

Author: fixitworkshop.co.uk

Hi, my name's Matt and I'm on a mission to save everyday items from the bin. Many things are repairable, but we've seemingly fallen out of love with mending things. I aim to fix that by publishing each repair I carry out in the hope that others will be inspired to repair their things and keep them for longer.

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