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Boki drive technology

The tried and tested drive technology of the Boki Excavators delivers efficiency in many different operating conditions.

Drive for hand-guided models

The hand-guided models have a hydraulic wheel motor drive, which makes the excavator easy to manoeuvre.

The operator can choose between 2 driving modes:

Fast driving
In this mode, only the single-wheel motor is driven. The excavator reaches the maximum driving speed of approx. 6 km/h in this mode.

4-wheel drive
All three travel motors are driven simultaneously in four-wheel drive mode. The drive achieves the highest traction at a maximum speed of 2 km/h.

The hand-guided Boki Excavator is manoeuvred using the control buttons on the drawbar.

The controls are not only used to drive the Boki, but optionally also to regulate the level. This allows the excavator to be easily placed at its working location and correctly levelled.

Mobile excavator drive

All four wheels of the Boki 2651 mobile excavator are permanently driven by hydraulic wheel motors, which ensures the best traction and performance. The two larger models 4552 and 6552 of the Reform Boki series have an innovative drive concept. The hydrostatic drive has 2 speed levels and is controlled automatically. This means that the excavator’s driving speed can be controlled exclusively via the engine speed. The traction power of the travel drive automatically adapts to the changing load from the different driving situations. The drive is on the front axle, which is equipped with a locking differential. The 4 wheel drive can be engaged for better traction. 

Four-wheel drive

All Boki mobile excavators have a self-locking differential on the front axle for better traction in difficult conditions. The four-wheel drive can also be activated via the transfer gearbox in case of poor traction.

The four-wheel drive can be turned on and off easily via a switch. An indicator light in the dashboard alerts the driver when four-wheel drive is activated.

Level compensation and axle locking

All Boki Excavators can be equipped with level compensation. With level compensation, the excavator can be tilted to the left or to the right. Level compensation is electro-hydraulic and can be operated with ease from the driver’s seat.


The sprung Boki Excavators can also be equipped with optional axle locking, which locks the suspension hydraulically. Axle locking is especially designed for driving on uneven terrain.

Steering modes

The various steering modes of the Boki mobile excavators provide exceptional manoeuvrability. There are 4 different steering modes available.


  • Front wheel steering
  • 4 wheel steering
  • Crab steering
  • Rear wheel steering

Dimensions and overhang

With a width of 83 to 150 cm, Boki Excavators are extremely manoeuvrable and flexible. There is the right model, even for the narrowest of working conditions. With a width from only 98.5 cm, the mobile excavators are also extremely manoeuvrable and can reach practically site.

In addition to the narrow dimensions, the minimal overhang at the rear makes for comfortable working even in the tightest of spaces.


When developing the Boki Excavators, we constantly worked to achieve an optimal weight ratio. The use of high-strength steels, an optimised structural design and perfect weight distribution make the Boki Excavators unbeatable.

A low weight ensures a high level of soil protection and prevents damage to roads and traffic lanes.


The flexible and extremely efficient diesel engines utilise a very high torque over a wide speed range and benefit from enormous engine output. The high torque ensures full power and flexibility in partial load operation. The mounting of engine and cab keeps oscillations and vibrations out of the cab.

Depending on the power class, proven engine technology from Kubota and VM-Motori is installed. These modern engines score points with high torque and maximum efficiency.

Exhaust gas treatment

The different performance classes require different exhaust gas treatment systems. The requirements for exhaust gas treatment increase with higher performance and are continuously being tightened up by the legislator in various countries. REFORM complies all legal regulations throughout its product range and constantly offers its customers the latest technology for engines and exhaust gas treatment systems.

The more stringent emission stages reduce various pollutants in the exhaust gases of diesel engines.

  • Carbon monoxide (CO)
  • Hydrocarbon (HC)
  • Nitrogen oxide (NOx)
  • Particulate matter (PM)

Installing different exhaust gas treatment systems greatly reduces emissions of pollutants.

Engines of emission stages 3A and 3B

The models in the category up to 37 kW/50 hp are equipped with Kubota engines that meet the requirements of emission stage 3A. They are equipped with exhaust gas recirculation.

The 72 hp models are equipped with VM motors. These engines come with exhaust gas recirculation and a diesel particulate filter to meet the legal requirements of stage 3B. The Boki models are equipped with self-regenerating particulate filters. The closed-loop diesel particulate filter system reduces soot emissions by over 98%. The system also absorbs and eliminates 99.9% of the particulate matter.


A large selection of different tyres provides optimum grip for all applications. Various tyres with different special treads ensure maximum traction, low ground pressure and reliable safety in use. They provide grip on difficult soils and in harsh operating conditions.