Maintenance pits / assembly pits of HDC prefabricated pits

for truck, bus and car

The heart of a perfectly functioning workshop is the maintenance pit - also called assembly pit, test pit, working pit or workshop pit. In large workshops in particular, a maintenance pit ensures that throughput times are kept to a minimum and that work on trucks, buses or cars is as effective as possible.
A workshop pit makes working on a truck, car or bus much easier and its ergonomic design also improves comfort and health when working.

  • But what should you consider when buying or building a maintenance pit?
  • What dimensions should be observed?
  • Are there any regulations or special permits for maintenance pits that need to be applied for?

This info page on the subject of maintenance pits / assembly pits provides you with all the relevant information.

You need more information about the maintenance pits or assembly pits from <ignore class="ignore-from-translation">HDC-Fertiggruben</ignore>?

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Your advantages with maintenance pits and assembly pits from HDC prefabricated pits

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Comfortable working at a pleasant standing height possible

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No accumulation of rainwater in outdoor pits due to watercourse

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Complete utilization of the available space possible with closed pit

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No additional equipment required due to ground level access

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Various cover options - e.g. roller covers

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Suitable for truck, car and bus

We are your specialist for individual maintenance pits, prefabricated assembly pits, inspection pits, working pits and prefabricated pits!
For trucks, buses and cars

What are maintenance pits / assembly pits?

A maintenance pit / assembly pit - also called a vehicle pit, work pit, inspection pit or generally a workshop pit - refers to a shaft (pit) in which work can be carried out underneath a vehicle (bus, truck, car). The pit, which is accessible to people, allows work to be carried out while standing and - in contrast to a lifting platform - can be used to best effect even if the facility is low. The use of a vehicle pit is therefore particularly suitable in workshops or garages.

Individual equipment options:

Your assembly pits or maintenance pits can be equipped individually:

  • Pit jack
  • Compressed air
  • Exhaust air
  • Lighting
  • Fresh oil supply
  • Electrical installations
  • Articulated play tester
  • Rolling brake tester

Truck repairs and maintenance

The prefabricated assembly pits / working pits are ideal for maintenance or repair on the truck. Haulage companies are dependent on their truck fleet, because a stationary truck does not bring in any money. A regular check of the trucks with the help of a maintenance pit is therefore essential. The maintenance pit allows multiple mechanics to work on the truck at the same time, minimizing truck downtime: Drive over the maintenance pit - start repairing the truck!

Certified assembly pits / maintenance pits

Certified TÜV Rheinland

Certified assembly pits / maintenance pits

  • certified by the DIBt with the approval no. Z-38.5-300
  • manufactured according to SLW 60
  • statics tested according to "EUROCODE" standards
  • pits correspond to the accident prevention regulations of the professional association BGR and DGUV
  • correspond to the regulations of AwSV, WHG, TRBS, TRGS
  • manufactured on the basis of our quality management according to ISO guidelines

FAQ on maintenance pits and precast assembly pits

Our Infocenter gives you an overview of the most important questions on the subject of "workshop or maintenance pits".

You are free to choose the length of your maintenance or assembly pit. In general, it should only be noted here that both pit accesses are not blocked at the same time if you are repairing a long vehicle. An orientation value would be e.g. 20 metres, but there are no limits upwards - depending on the size of your workshop.

A standard measurement for the width of a maintenance pit is approx. 0.9 - 1.05 metres. For the depth, a standard value of 1.39 metres applies for vehicles with a lot of ground clearance (e.g. trucks) and 1.49 metres for low ground clearance (e.g. buses). Make sure that you can stand comfortably in the pit and have the necessary space to work. From a depth of 1.60 metres, however, you must additionally observe the regulations for a necessary forced ventilation.

The equipment of a maintenance pit / assembly pit can be designed individually and usually depends on the size of the workshop or garage and the planned use of the pit. If, for example, a mobile pit jack is included in your planning, there should also be a corresponding storage space or recess for the pit jack. In order to create space for lighting, compressed air or supply lines, you have the option of widening the maintenance pit below the pit enclosure on both sides.

However, there are also a few regulations to consider when equipping a maintenance pit: For example, it is mandatory that your pit has two access points - an emergency exit as a substitute is only permitted under special precautions. In addition, the pit lighting should not protrude into the pit and there must be a suitable pump sump.

When you leave your workshop in the evening, the pit must be covered for safety reasons. Even if a pit is not used for a longer period of time, you must ensure sufficient protection by means of a cover, for example with roller covers, in order to prevent accidents. You have various options for this: You can either put up barrier chains or standpipes, or cover the entire pit with panels, gratings or planks - depending on what makes more sense for your workshop or garage.

When completely covering the maintenance pit, you should make sure that it is level with the ground and as stable as possible so that vehicles can still drive over the pit surface safely.

First we come to you with our mobile DEMO service and offer you a pit presentation on site free of charge. Here we can clarify all questions regarding your future prefabricated pits or working pits. Afterwards we design your installation pit including individual equipment with our 3D pit configurator. Then comes the installation: Either you as the client take over part of the preparations or we offer you all construction services from installation "all from one source". Finally, additional fittings are installed by our HDC prefabricated pit team and the turnkey handover takes place.

Floor-running pit jack: The feature for your truck pits
The floor-running pit jack is installed on a rail system that serves as a running surface. With the help of a pit lift, a truck can be lifted effortlessly, for example. The rail system ensures that the floor-mounted pit lift runs smoothly. The pit lift is available as a floor-running pit lift or suspended.

Important decision criteria when choosing the right pit edging are safety and load-bearing capacity. Make sure that the installation pit can be driven into and over without any problems. Ideally, the pit can also be left again in the direction of travel - then it may even be possible to dispense with wheel deflectors.

In most cases, the pit enclosure is also used as a running rail for the chassis of the pit lift. For this purpose, various static requirements must be met, e.g. with regard to the size or spacing of the profiles.

Assembly pits are also called maintenance pits or workshop pits. In general, they are prefabricated pits for convenient working, for example under a truck, bus or car.

What hobby mechanic doesn't wish for that? Their own lifting platform with pit jack in the garage. But usually there is a problem with the limited ceiling height, the lack of space or the load capacity of the floor. A good alternative to the lifting platform can then be an assembly pit. Sunk into the concrete floor to save space and covered safely and invisibly when not in use, the assembly pit is also becoming increasingly popular for private use.

Once you have decided to have your own maintenance pit or assembly pit in your garage, you will first need a building permit, depending on the federal state. In any case, also take a structural engineer to the side, who will take care of the static calculations.

In order to avoid water damage, the so-called concrete white tank has become established in building planning. The closed concrete tub meets all the requirements for durable structures and takes into account both the room climate and the specific building physics conditions. The concrete is impermeable to water and protects the working area of the pit from penetrating moisture.

If you build your maintenance pit yourself, you can of course design it entirely according to your individual wishes. Nevertheless, there are some criteria that you should take into account. For example, how long and high is the vehicle you regularly work on? The width of the pit should not be too narrow, so that you can still move comfortably and without problems in the working area. And are you yourself rather tall or short? To avoid overhead work and thus the risk of back pain, it should always be possible to work in an upright position.

Always pay attention to safety in your maintenance pit. Not only can an insufficient cover be a source of danger, but even a small amount of gasoline combined with a spark or exhaust fumes can sink into the pit and be harmful to your health. In addition, the base plate must be stable enough. It is therefore always sensible to install a technical ventilation system (exhaust air), which leads the dangerous vapours out of the installation again. For the lighting, fluorescent tubes have proven themselves, which are installed recessed in the pit wall and thus cannot be damaged.

If your individual wishes can be reconciled with the necessary safety aspects and static requirements, nothing stands in the way of your dream of your own maintenance pit in the garage.

All prefabricated pits have a warranty of 24 months. Electrical or wear parts, on the other hand, have a warranty of 12 months. The premise for the longevity of our prefabricated pits is regular cleaning and maintenance.

Joint play testers are used in pits to check the joint play. In this way, defective axle parts can be reliably detected during technical vehicle inspections or truck inspections.

Your prefabricated pits A-Team: Get to know us personally


Hermann Lümmen

+49 (0) 2241 26 47 18

Expert advice

Michael Krönig

+49 (0) 7121 26726 40
+49 (0) 1738077596

Zum Wäldle 11
D 72768 Reutlingen

Specialist advice/
Head office

Timo Thomas

+49 (0) 2241 26 47 18

Specialist advice/
Head office

Walter Biergans

+49 (0) 2241 26 47 18