Forced Action Mixer FAQ

We get asked many questions regarding our SoRoTo forced action mixers and so we have put together a collection of answers to the most common questions we receive. If you have a question which isn't answered below then please feel free to get in touch with us using the form on the Contact Us page.

Which model for resin bound gravel?
Unlike many other manufacturers of forced action mixers, the model number of a SoRoTo mixer is the actual mixing capacity of the pan. E.g. the SoRoTo 100L forced action mixer has a mixing capacity of 100 litres. A typical 4-bag, 100kg mix of 1-5mm gravel and a 6.5-7.5kg bucket of resin will fit perfectly into a SoRoTo 100L forced action mixer.
Rubber or Steel Blades?

When making your purchase of a SoRoTo forced action mixer, it will ship with steel blades as standard. These steel blades are the most common option in the UK and are durable and solid, designed for hard and intensive use. When mixing materials containing aggregates, these steel paddles will wear and can cause extra strain on the gear. By using rubber blades, they will offer an amount of flexibility, meaning the load on the gearbox is reduced. We recommend that you consider this when placing your order and it's recommended to purchase either a spare set of blades/arms, either steel or rubber.

When mixing resin bound aggregate or wet pour rubber, it is ONLY advisable to use steel paddles due to the intense cleaning regime required to remove the cured resin.

How do I change the mixing blades?
On certain machines, the steel blades at the end of the mixing arms are removable, and rubber blades are removable on all models. These can simply be bolted off of the end of the mixing arms and replaced using the correct parts for your machine.
How do I change the rubber on my blades?

Each rubber section of the rubber blades can be removed once worn beyond reasonable use by loosening the nut and bolt on the end of the mixing arm. The new replacement rubber blade can then be fitted and the nut and bolt retightened. Thanks to the way these are manufactured, as the rubber blade wears, it can be moved further down in its holder in order to maximise the lifespan of the parts.

Can I mix wet pour or resin bound in a forced action mixer?

Yes you can! We sell many forced action mixers in the UK for the purpose of mixing resin bound aggregates and wet pour rubber and SoRoTo is one of the most prolific machines on the UK market for this purpose.

When mixing resin bound aggregates, it's advisable to only use steel blades as the rubber blades are not resilient enough to endure the cleaning regime required to keep the mixer in its best condition. Often the only way to remove cured resin is by chemical or intense heat which can be critically damaging to the rubber paddles.

How do I fit a dust controller?

The optional dust controller attachment helps to limit the amount of hazardous or nuisance dust which can be emitted from the machine during filling or mixing operation. It can be fitted very easily by mounting it inside the top safety grille, where the pipe from the dust controller will fit through the pre-drilled hole at the top. It can then be connected to an industrial vacuum in order to take the dust away from the site in a controlled manner.

Which mixing arms for do I use for the 300L?

The older SoRoTo 300L forced action mixer had longer mixing arms than the current model. When the grid lid was changed from the flat design to the domed design (for increased strength and safety) the length of the mixing arms was reduced. Both the old, longer arms and the new shorter arms are available to order.

Old 300L style: arm length approx 420mm to top disc
New 300L style: arm length approx 390mm to top disc

How can I tow a SoRoTo 300L?

By purchasing an optional ball coupling (tow-hitch) for the 300L, it can be pulled behind a car or van for easier transportation. Please be aware of any speed or towing restrictions which may apply in the country of use.

How do I clean my mixer?
How do I find my serial number?
The serial number on a SoRoTo forced action mixer is on the side of the main on/off switch on a silver, metallic plate. This will list the model of the machine, the voltage, year of manufacture and its serial number. By providing us with this number, it can help us to ascertain the components which were used in the build of your mixer and is also used for warranty registration.  
Mixer gate is stuck shut!

Occasionally, if the mixer has been used to combining resinous glues, the gate (trap door) can become stuck and will not open to allow the materials to escape the mixing pan. This can usually be avoided by using a wire brush dipped in white spirit to clean the rails on which the mixer gate runs. If the trap door is seized closed, often the only way to free it is by very carefully and gently heating both the top and bottom of the mixer gate using a hot air gun or blowtorch. This should help the resin become tacky again and the excess and obvious debris can be removed with a metal wallpaper scraper.

While the resinous material is still hot, gradually apply firm pressure to the mixer gate handle in order to help it move along its runners. Do not use a hammer or other heavy item as this will likely cause damage to the machine. Once the mixer gate has opened, applying gentle heat again, remove any more traces of resinous material or debris with a metal scraper, wire brush and a cloth.

The mixer head/arms keeps rising

The mixing head and arms may sometimes rise when the machine is in operation. Check that the base of the pan is clean and free from hardened debris as this can contact with the bottom of the blades, making the mixing head rise up and providing an inferior mix. It's also wise to ensure you're using the correct type of blades for the material you're mixing (recommended use of rubber blades for aggregate over 8mm diameter) as smaller pieces of aggregate may be getting caught between the pan wall/base and forcing the mixing head upwards.

Fitting a new grid lid on an old mixer

If you have an older SoRoTo forced action mixer with a flat top grille, it is possible to replace the lid with the new style, improved domed lid. The only thing to be aware of is that the size of the hinge has changed. If you have a lid with a 55cm hinge, it is still possible to replace the lid with the new, domed style however you will need to purchase additional Z-brackets in order to make the fit.

Which size mixer do I have?
You have a few options here to determine the size of your mixer.
  1. You can look at the front of your mixer where there should be a large sticker which details the model, e.g. 100L-30. 100L means that the machine has a mixing capacity of 100 litres and the mixing arms rotate at 30rpm (which is the same on all models).
  2. The serial number of your mixer should be a 7 digit number on a metal plate near the on/off switch. The first three numbers indicate the size e.g. 040xxxx = 40L
  3. You can measure the size of the drum and contact us with the measurements where we will be able to ascertain the model of your machine.
How do I mount the Turboarm on the 300L?
The fitting of the TurboArm on to the 300L machine is relatively simple. The result of its use is a much reduced mixing time when used for mixing mortar without any aggregate. All that is needed to be done to make the change is to remove the arm marked as #21 on the diagram below on the standard mixing head for the optional TurboArm. Please note, this should only be used for smooth mixes only, do not use with aggregates.
I have another question

If you have another question for us, please feel free to get in touch either using the LiveChat feature of our website which you can find in the bottom right corner of your screen. Operators are available 9am - 5pm Monday to Thursday and 9am to 4pm on Friday. Outside of these hours, you can use the same feature to leave us a message and we will contact you as soon as we can.