Vacuum trucks and industrial cleaning equipment, from order to delivery

Production process in the factory

in the factory production process koks group header

As a manufacturer and supplier of state-of-the-art vacuum trucks and industrial cleaning equipment, KOKS makes every effort to fulfill the wishes of each customer. This entire process takes place in our factory in Alkmaar. Around 150 employees do their utmost to ensure all KOKS products meet the highest possible quality requirements. In the thirty years that KOKS has been operational, this process continues to be improved.


Every project starts in the engineering department. This department is responsible for the design of the vehicles, as well as for their technical implementation. For example, our engineers calculate whether the pressure/vacuum placed on a tank will be within legal tolerances. They also check whether all the component parts can be driven, and whether everything the customer wants will fit onto the vehicle. From force calculations to design drawings - everything starts with engineering.

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in the factory koks group alkmaar production process

Production process

Once everything has been designed, calculated, developed and ordered, all the required component parts will arrive at the logistics department exactly one week before the start of production. Why one week before start? This is because the KOKS work process dictates each product completes a production stage every week during the production process. The entire process consists of 5 stages of preliminary assembly work, 2 phases of preservation work and 5 phases of final assembly work. As a result, the entire production process, from beginning to end, including final production, takes a total of 12 weeks.

Preliminary assembly

When all the component parts have arrived at the logistics department, they go to Phase one of preliminary assembly. During the five different preliminary assembly phases, the individual component parts (Phase 1) are completely built up onto an unsprayed vehicle (Phase 5). During this last preliminary assembly phase, the product is a bare, (stainless) steel construction mounted on a truck chassis. This initial build provides assurance that all the parts fit and are well-connected. After an internal inspection, the entire vehicle is disassembled and transferred to the preservation process.

in the factory koks group alkmaar preliminary assembly
in the factory koks group welding robot

Welding robot

The best of the best ... vacuum trucks manufactured with passion. In our state-of-the-art factories, KOKS combines the best of both worlds. Experienced craftsmen and modern production equipment, such as welding robots and tank rollers, ensure optimum efficiency and top quality. And our customers benefit from that.


The preservation of all parts is carried out very carefully. For example, component parts are galvanised, stained, scoped and sprayed in the customer's desired colour(s). The latter takes place in our own sustainable paint shop where the spray booths are heated with residual heat from the domestic refuse site over the road. This in-house paint shop is ideal because KOKS places high demands on the preservation work and preserves each part separately. After two weeks of staining, sanding, filling, priming and colour finishing, everything goes to final assembly. 

in the factory koks group preservation
in the factory koks groups spray works paint shop

Paint shop

KOKS has its own paint shop called KOKS Spray Works. The entire paint shop measures 900 m² and is equipped with two modern spray booths and two 17 x 6 m preparatory compartments. When setting up the new internal paint shop in 2016, cooperation was sought with our “neighbour over the road”, HVC waste energy plant. Together we searched for other, green energy sources for heating the spray booth ovens. This was to be an alternative to a gas installation, which is what practically all paint shops in the Netherlands are equipped with. KOKS Spray Works chose to heat the paint shop ovens using warm water. We are unique in the Netherlands. HVC supplies this via a water delivery system, and we achieve a huge CO2 reduction. Our 8 painters at KOKS Spray Works give their best every day to establish a brilliant and colourful final result for our customers.

Final assembly

The final assembly department is where the vehicle is finally built up into a fully functional end product. All the preserved component parts and required components come together and are assembled into a complete vehicle in the five phases of final assembly work. It starts with an empty truck chassis. The frame is placed on the chassis, followed by the tank and piping. It is now starting to look like a real truck. The cabinets, control panel, valves and all other components are then put into place. The truck is now ready to be set up and tested. This does not mean, however, that the vehicle is ready for delivery to the customer.

in the factory koks group final assembly
in the factory koks group quality control delivery vacuum trucks

Quality control and delivery

The final phase of the entire process is quality control. Our quality controller takes every vehicle and checks whether everything is secured properly, working correctly, and manufactured according to the high quality requirements demanded by KOKS. Once it has successfully completed the approval process, the vehicle will receive an approval sticker and can be delivered to the new owner, or our customer.

KOKS Group is an international manufacturer and supplier of vacuum trucks and heavy industrial cleaning equipment, built in accordance with the latest PED, ADR (Ceoc), DOT 407/412 standards. Founded in 1989 and has since grown into a dynamic company that operates globally and consists of eight specialised subsidiaries in the USA, The Netherlands, the Czech Republic, Saudi Arabia, Slovakia and participations in rental organizations that operate in the Netherlands and the United Kingdom. As a growing, innovative, healthy and reliable company, KOKS Group has gained an excellent reputation in the (petro)chemical sector and other industries as a vacuum truck builder.

Vacuum truck factory KOKS Group in Alkmaar, The Netherlands

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Do you have a question or comment about our products and services. Just get in touch with our Customer Service desk. We are ready to help you, 24/7. Feel free to contact us!