Minprovise redesigns Dugless 900

Minprovises’ commitment to the continuous improvement of their products and services has seen the company upgrade their popular Dugless 900 automated mini-loader in response to the feedback of clients.

The need for innovation stemmed from feedback received from clients specifically on the performance of the Dugless 900 Air Intake System while working in confined and dusty spaces.

The digger often works under conveyor systems and around spillage build ups, meaning the air filter cartridges required regular change outs due to the amount of dust being collected. Excess dust coming through the engine could also lead to “dusting of the engine.”

In response to client feedback, the Minprovise quality control, engineering and Dugless teams put their minds together to develop a new system which could successfully filter dust particles more efficiently, optimising the Dugless machine’s operation times and reducing the number of required filter change outs.


Initially, the research team found that the use of a single cyclone assembly could successfully remove dust articles before they even reached the dual filtration system.

The first prototype of this design was based on a single cyclone, but had no consideration in terms of its placement within the machine due to its larger size and shape.

The prototype yielded good filtration results but created a new dilemma for the design team – how to build a cyclone system which could fit within the uniquely compact Dugless frame.


The first phase of development for the Dugless 900 Air Intake System.

The single cyclone prototype yielded strong dust filtration results, but required redesign in its shape and size to fit within the compact Dugless frame.


Advancing from the external single cyclone system, the team at Minprovise needed to manipulate this design so that the system could be successfully integrated into the current Dugless air filtration compartment of the machine.

Subsequently the engineering team designed a single layer, multi-staged cyclone that was retrofittable with the current Dugless shape and design.


Phase two of the air intake redesign saw the manipulation of the cyclone system into a format which could fit internally within the compact Dugless frame.

The end result was a single-layer, 10 chamber multi-cyclone assembly.


Now that phase two had created a cyclone air intake assembly complimentary of the compact Dugless shape, the engineering team needed only test and optimise the new design.

The final result was an eight chamber, single layer, multi-cyclone assembly. By experimenting with the number of chambers (starting at 10 and working down to seven) the design team concluded that the eight port multi-cyclone provided optimum results for the amount of dust particles collected, while fitting with the Dugless design envelope for retrofitting.


Once the Minprovise engineering and research team confirmed through extensive testing and retesting that the eight-chamber air intake system was the optimum design, final tests were conducted to reach the greatest efficiencies of this design.

A 3D model of the eight-chamber system was block run through an airflow analysis program to determine an remove any inefficient airflows in the design that could be engineered out. The chamber design was fine-tuned to maximise the vortex effect, ensuring maximum particle extraction.

The final assembly is now made up of 16 components and hugely reduces the number of air filter change outs, thereby decreasing downtime/maintenance.


The operator will empty dust collection tray and check the filter condition now only once a day at pre-start (rather than several times a day).

Based on in-field results with clients (2×8 hour shifts, per 24 hours) the machine now uses:

– One outer filter at $36.20 per filter over a seven day period

– One inner filter at $30.40 per filter over a seven day period

– Previously the Dugless had been using 14 of the standard filters at $115.94 per filter over a seven-day period

The new 3D printed base material has been chosen to maximise the systems wear characteristics and provide sufficient durability to handle the vibration of the machine during use.

Lastly, another advantage includes significantly less dust ingress into the engine, evidence form servicing of a client machine after the first 100 hours of usage.

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