Overhaul of the Liebherr D934 A7 Engine in a Liebherr R 926 Crawler Excavator
The Liebherr R 926 crawler excavator is designed for intensive earthmoving, excavation, site preparation and infrastructure projects. In these applications, the diesel engine must deliver reliable performance during prolonged operation under load, as well as throughout repetitive working cycles. The engine powers not only the machine's movement but also provides the energy required for the hydraulic system to operate correctly. For this reason, a deterioration in engine performance can directly affect the productivity of the entire excavator.
When overhauling a Liebherr D934 A7 engine, it is essential to identify the cause of the failure, assess the technical condition of individual components and restore the engine to proper operating condition. Simply repairing the most visible damage is not always sufficient. Wear in one component may be associated with inadequate lubrication, excessive operating temperatures or prolonged operation under heavy loads. A comprehensive diesel engine overhaul should therefore include diagnostics, removal, measurements, component inspection, reconditioning and controlled testing after assembly.
WIBAKO specialises in servicing diesel engines used in construction machinery. Our services include engine removal and installation, as well as transporting engines to our workshop in Kojszówka, Poland. An important part of the overhaul process is checking engine performance on an engine dynamometer before reinstalling the unit in the machine. This makes it possible to assess the engine under load and reduce the risk of problems being discovered only after the excavator returns to the construction site.
The exact scope of a Liebherr D934 A7 engine overhaul in a Liebherr R 926 crawler excavator should be determined by diagnostic results and component measurements. The following description presents an example of a comprehensive engine repair process, assuming that wear in the piston assembly is identified as the reason for the overhaul. The final scope of work always depends on the actual technical condition of the engine and the results of the inspection.
Initial Diagnostics of the Liebherr D934 A7 Engine
Before deciding to remove the engine, it is necessary to determine whether the observed symptoms actually indicate an engine failure. Reduced excavator power, increased engine oil consumption, excessive exhaust smoke or starting difficulties can have several causes. Some are related to mechanical wear, while others may result from problems with the fuel system, intake system, cooling system or engine accessories.
In this example, the diagnostic process begins with a gradual deterioration in the performance of the Liebherr R 926 excavator and increased oil consumption. The mechanics start by checking the oil level and condition, inspecting for visible leaks, assessing the tightness of connections and examining the intake and cooling systems. They also inspect the filters and check for unusual noises during engine operation.
The available engine operating parameters are then analysed. Depending on the engine control system version and diagnostic capabilities, stored fault codes, sensor readings and temperature and pressure data are checked. If the engine can be operated safely, additional observations can be made while it is running. When piston and cylinder wear is suspected, it is particularly important to determine whether the symptoms are accompanied by reduced compression or excessive crankcase blow-by.
Depending on the engine design and available measurement points, diagnostics may include a compression test, cylinder leak-down test or inspection of the cylinder surfaces using a borescope. Borescope inspection makes it possible to assess visible signs of wear, scoring and damage without first completely dismantling the engine. However, these findings must be interpreted alongside other symptoms, as a single measurement is not always sufficient to determine the full extent of the damage.
Inspection of the lubrication system is also important. The mechanics check oil pressure, inspect the filter and look for possible contamination. Metal particles may indicate progressive wear of interacting components, but their source must be identified. If diagnostic results confirm serious mechanical wear, continued engine operation could lead to further damage. In such cases, removing the engine for a comprehensive workshop inspection is justified.
Removing the Engine from the Liebherr R 926 Excavator
Once the necessary work has been established, preparations can begin for removing the engine from the Liebherr R 926 excavator. This process requires the machine to be properly secured, the work area prepared and the sequence for disconnecting components carefully planned. Engine removal is carried out using a crane provided by the customer. The work must be performed by qualified mechanics in accordance with safety requirements and the service procedures applicable to the specific machine version.
First, the excavator is positioned on stable ground, and its systems are secured against accidental activation. The electrical power supply is disconnected, and the working area is prepared. The mechanics then identify the pipes, connections and accessories that must be disconnected before the engine can be removed. Marking individual connections makes reassembly easier and reduces the risk of mistakes.
The next step involves securing the cooling system, air intake and exhaust system. Where necessary, operating fluids are drained into suitable containers. Fuel lines, electrical connections and other accessory connections are disconnected in a way that minimises the risk of contamination and damage to the fittings. Particular care is required with components whose tightness and correct connection are essential for proper engine operation.
Before lifting the engine, the mechanics check that all mounts and connections have been properly released. The engine is prepared for lifting using the designated lifting points. It is then gradually removed from the engine compartment with the crane. Throughout this operation, its position and clearance from surrounding components are monitored to prevent damage to pipes, radiators, brackets and other machine components.
Once the engine has been removed, the accessible components in the engine compartment are also inspected. This may include engine mounts, pipes, cooling system connections and intake components. Identifying damaged or worn parts at this stage makes it easier to plan their replacement during reinstallation.
The removed engine is prepared for transport to the WIBAKO workshop in Kojszówka, Poland. There, it can be dismantled, thoroughly cleaned and measured. Separating the work carried out at the customer's site from the detailed workshop inspection helps organise the entire overhaul process and establish the repair scope based on the engine's actual technical condition.
Inspection of the Liebherr D934 A7 Engine Components
After arriving at the workshop, the Liebherr D934 A7 engine is prepared for dismantling. The first step is to clean the external surfaces and check that the unit is complete. The mechanics then remove the accessories, covers, oil sump, cylinder head and other components necessary to access the piston assembly. The sequence of operations is adapted to the engine design and the type of damage identified during the initial diagnostics.
The dismantled components are cleaned and assessed individually. The inspection involves more than a visual assessment. For components whose wear can be determined through measurements, the mechanics check their working dimensions and compare them with the relevant service specifications. This makes it possible to determine which components can be reused, which require reconditioning and which must be replaced.
Particular attention is paid to the piston assembly, including the pistons, piston rings, cylinder liners, connecting rods and crankshaft. The mechanics inspect the working surfaces for wear, signs of overheating, scoring and other damage. The crankshaft and connecting rod bearings are also assessed, as their wear can affect proper lubrication and generate unusual noises during engine operation.
The crankshaft undergoes a visual inspection and dimensional measurements. The main and connecting rod journals, crankshaft runout and oil passages are checked. Depending on the results, the crankshaft is approved for further use, referred for appropriate reconditioning or replaced. If damage exceeds the permissible limits, the repair scope must be adjusted to reflect the actual condition of the component.
The cylinder head inspection includes checking its surfaces, valve seats, guides and valves. The head is also tested for leaks to identify possible cracks or other damage that could cause compression problems or excessive operating temperatures. If necessary, the cylinder head is sent for reconditioning, with the scope of work determined by the inspection results and the degree of wear.
The turbocharger, oil pump, fuel system components and electrical accessories require separate assessment. In the case of the turbocharger, the mechanics check axial and radial play, along with the condition of accessible surfaces. The fuel system is inspected according to the symptoms identified, and components requiring specialised testing may be sent to an appropriate specialist facility. Replacement of every component is not automatically assumed. Decisions are based on the actual condition of the parts and whether further use is technically justified.
Once the measurements and inspections are complete, a detailed repair plan can be prepared. This identifies the components to be reused, reconditioned or replaced. Such an approach is important for both repair durability and cost control. Only after the scope of work has been established can the actual rebuilding of the Liebherr D934 A7 engine begin.
Overhauling the Piston Assembly
If the inspection confirms excessive wear in the piston assembly, repairing this area becomes one of the most important parts of the overhaul. The interaction between the pistons, piston rings, cylinders, connecting rods and crankshaft affects compression, force transmission and proper engine lubrication. Problems in this area can lead to reduced power, increased oil consumption and accelerated wear of other components.
After the components have been thoroughly cleaned, the mechanics assess the condition of the cylinders and the surfaces that interact with the pistons. Depending on the engine design and measurement results, they determine whether individual components can be reused or must be replaced. Maintaining the correct working dimensions and assembly clearances is essential, as these directly affect sealing and engine durability.
The pistons and piston rings are inspected for wear, mechanical damage and signs of excessive temperature. During reassembly, the specified piston ring installation procedure, component positioning and clearances must be observed. If any irregularities are identified, the affected parts are replaced with suitable components that meet the requirements for the specific engine version.
The connecting rods are checked for cracks, deformation, signs of overheating and wear on their working surfaces. The inspection also includes an assessment of the fastening components. During assembly, the correct sequence and tightening specifications provided in the service documentation must be followed. Incorrect assembly can cause damage even when the components themselves are in good condition.
Following dimensional inspection, the crankshaft may be approved for further use, sent for suitable reconditioning or replaced. If grinding is required, the permissible repair dimensions must be taken into account, and the correct bearings selected. All interacting surfaces must be thoroughly cleaned before assembly. The oil passages must also be checked for blockages to reduce the risk of renewed damage caused by contamination.
Inspection of the lubrication system is another important part of the overhaul. The oil pump and other accessible components are assessed for wear and their ability to provide the required oil flow. Contamination resulting from the failure must be removed from areas where it could cause further damage. Replacing worn components and properly preparing assembly surfaces are essential for the durability of the repair.
Once the work is complete, all piston assembly components are installed according to the relevant technical requirements. The mechanics check clearances, component positioning and the correctness of each assembly stage. Only after these checks can work proceed to the next stages of rebuilding the Liebherr D934 A7 engine.
Cylinder Head Reconditioning and Timing System Inspection
The cylinder head is responsible for proper gas exchange, combustion chamber sealing and the interaction between the valves and other engine components. Its condition directly affects starting, smooth operation and the engine's ability to achieve the required performance. For this reason, the cylinder head should be thoroughly inspected during a Liebherr D934 A7 overhaul, even when the primary cause of the failure has been identified in the piston assembly.
The inspection begins with cleaning the cylinder head and examining its surfaces. Its tightness, valve seats, guides and valves are then checked. Depending on the findings, the cylinder head may be approved for further use, repaired or subjected to more extensive reconditioning. If damage affecting sealing is detected, its cause and extent must be established before the head is approved for reinstallation.
Reconditioning may include resurfacing, replacing valve guides and valves, and carrying out other work required by the component's condition. All operations must be adapted to the specifications of the particular cylinder head. Maintaining the correct dimensions is essential, as excessive machining or incorrect component selection can affect engine performance.
The timing system is also inspected. The mechanics check the condition of the camshaft, its journals and lobes, and assess the interacting components. Wear on working surfaces can interfere with correct valve operation, so any damage identified may require the relevant components to be repaired or replaced. The inspection also includes checking the correct timing alignment during subsequent assembly.
After the work is completed, the cylinder head is prepared for reinstallation on the engine block. The mating surfaces must be clean and free from contamination. Appropriate sealing components are installed, and the fasteners are tightened in the sequence and to the specifications provided by the manufacturer. Correct execution of these operations reduces the risk of leaks and operating problems after the engine is returned to service.
Fuel System and Engine Accessory Inspection
A comprehensive overhaul of the Liebherr D934 A7 engine should also include inspection of the fuel system and other accessories. Even when the primary failure is related to mechanical wear, leaving a faulty auxiliary component in place can make starting difficult or negatively affect subsequent engine operation.
The scope of fuel system inspection depends on the symptoms identified before removal and the workshop findings. Where necessary, the mechanics check the condition of the lines, connections and components responsible for supplying fuel. Injectors and other components requiring specialised verification may be sent to an appropriate test facility. If diagnostics reveal irregularities, the repair scope is extended to include the work necessary to restore correct system operation.
The turbocharger is also inspected. The mechanics check its condition, assess rotor play and accessible surfaces, and look for signs of damage. Turbocharger malfunctions can affect the amount of air supplied to the cylinders and consequently influence engine performance and exhaust smoke. If damage is identified, the component should undergo appropriate reconditioning or be replaced.
The starter motor, alternator, electrical installation and sensors required for starting and monitoring the engine are also checked. The condition of wires and connectors is assessed, along with the availability of signals required by the control system. Depending on the engine version and exhaust aftertreatment system, the inspection may also include additional emission control components.
The cooling system and air intake pipes also require attention. Leaks, restricted flow or contaminated heat exchange surfaces can contribute to abnormal operating temperatures. During engine reinstallation, the condition of pipes, clamps, connections and seals must be checked. Any worn components should be replaced where necessary.
This approach makes it possible to assess the engine as a complete system rather than simply as a collection of independent components. The aim is not only to restore the mechanical parts but also to ensure the conditions required for proper operation once the engine has been installed in the Liebherr R 926 excavator.
Professional Assembly of the Liebherr D934 A7 Engine
Once the inspection and necessary reconditioning work have been completed, engine assembly can begin. This stage requires precision, cleanliness and strict adherence to assembly procedures. Even a small amount of contamination in an oil passage, an incorrect clearance or an assembly error can affect the durability of the rebuilt engine. For this reason, each stage should be preceded by checks confirming that the components and mating surfaces are properly prepared.
Before assembly, the mechanics recheck the condition of the components and confirm that all parts intended for reuse are complete and suitable. The engine block, oil passages and mating surfaces must be properly prepared. The piston assembly, crankshaft, connecting rods and other components are then installed in the sequence appropriate for the engine design. During this work, the mechanics check assembly clearances, component positioning and the correct seating of individual parts.
The cylinder head is then installed together with the appropriate seals and timing components. Connections are assembled according to the technical requirements, maintaining the specified tightening sequence and torque values provided by the manufacturer. The remaining accessories are then fitted, including lubrication and cooling system components and the parts required to start the engine.
After the mechanical assembly is complete, the fuel system lines and other components are installed. All connections must be clean, correctly seated and secured. Particular attention is paid to areas where leaks could cause fluid loss, disrupt the engine's fuel supply or prevent the unit from maintaining the correct operating parameters.
At the final stage, the correct installation of electrical accessories, sensors and control components is checked. The mechanics also verify that the engine can rotate freely where required by the service procedure and carry out the preparations necessary for the first start. The operating fluids and assembly materials used must comply with the requirements for the specific engine version.
Once assembly is complete, the engine is prepared for testing. Before starting, the mechanics ensure that all required systems are correctly connected and that the connections are leak-free. The fastening components and accessible mechanical connections are also inspected. This allows functional testing to begin without overlooking procedures that are essential for engine safety and durability.
Post-Overhaul Engine Dynamometer Testing
One of the important stages in a comprehensive Liebherr D934 A7 engine overhaul is testing the engine on a dynamometer. Testing the unit outside the machine makes it possible to assess its performance under controlled conditions without immediately reinstalling it in the Liebherr R 926 excavator. This is important because certain irregularities may only become apparent after the engine has warmed up or when the load is gradually increased.
Before testing begins, the engine is prepared in accordance with the test bench procedure. The mechanics check the connections required for safe starting, verify operating fluid levels and inspect the condition of the connections. The engine is then started for the first time, with particular attention paid to oil pressure, operating stability, temperature and possible leaks. Any unusual symptoms must be investigated before proceeding to the next stage.
For overhauled engines, the load test is carried out gradually. According to the procedure described in WIBAKO's materials, the engine may run for a minimum of 16 operating hours under light conditions, at approximately 20-30% of its nominal load. This period makes it possible to monitor the stability of the basic operating parameters during initial running-in and determine whether any irregularities requiring further inspection occur.
During this stage, the mechanics monitor oil pressure, operating temperature and engine behaviour under the selected operating conditions. They also check the tightness of connections and the stability of auxiliary systems. If the engine operates correctly and its basic parameters remain stable, testing can proceed to the next stages in accordance with the adopted test procedure.
After the initial running period, the load is gradually increased. The engine undergoes further tests at higher load levels, allowing its response to changing operating conditions to be assessed. The mechanics observe engine speed stability, temperature, oil pressure and behaviour as the engine moves between different operating points. Where suitable measurements are available, power and torque parameters are also analysed.
An important advantage of dynamometer testing is the ability to conduct trials under controlled conditions. During excavator operation, engine load changes according to the working cycle, ground resistance, hydraulic system movements and the operation of other components. On a test bench, the sequence of tests can be planned, the engine's responses observed and any deviations more accurately associated with specific operating conditions. This helps assess the engine's performance after the repairs.
Dynamometer testing does not replace all inspections carried out after the engine has been installed in the machine. However, it allows the unit to be checked before reinstallation and reduces the risk of an irregularity being discovered only after the excavator returns to the construction site. If deviations occur during testing, the mechanics can stop the test, perform additional diagnostics and identify the cause before the engine proceeds to the next stage.
Once testing is complete, the test procedure and results are assessed. Only after the engine's behaviour has been confirmed under the conditions tested can it be prepared for installation. For the customer, this provides an additional quality control stage, while the service team can verify the effectiveness of the repairs before the engine returns to its intended working environment.
Installing the Engine in the Liebherr R 926 Excavator
After the overhaul and successful completion of the required tests, the Liebherr D934 A7 engine can be prepared for reinstallation in the Liebherr R 926 crawler excavator. This stage requires precise organisation because the unit must be correctly positioned in the engine compartment, secured and connected to all machine systems. WIBAKO provides engine removal and installation services as part of its construction machinery maintenance operations, adapting the scope of work to the machine design and the conditions at the customer's site.
Before installation begins, the condition of the engine compartment and the components that will be reused are checked. The mechanics inspect the mounts, accessible pipes, connections and mating surfaces. Where necessary, the work area is cleaned and the components are prepared to minimise the risk of contamination entering the engine systems. This pre-installation inspection also helps identify worn accessories that could interfere with correct engine starting.
The engine is lifted using a crane provided by the customer. The mechanics monitor its position and gradually guide it into the engine compartment. Care must be taken throughout this operation to avoid damaging pipes, electrical wiring, radiators or adjacent components. Once the engine is correctly positioned, the mounts are installed and tightened in accordance with the technical requirements for the specific machine version.
The connections to the machine systems are then restored. Fuel lines, electrical connections, the cooling system, air intake and other components required for correct engine operation are connected. The mechanics pay particular attention to the routing and securing of pipes to prevent chafing, excessive tension or contact with hot components. If worn seals or pipes are identified, their replacement should be considered before the engine is started.
Restoring the tightness of the air intake and cooling systems is an important part of the installation process. Leaks in the air pipes can interfere with engine operation, while cooling system problems can cause excessive temperatures. The mechanics therefore check clamps, connectors, seals and the condition of the pipes after assembly. Exhaust system connections and accessories are also inspected, as incorrect installation may cause leaks or unwanted vibration.
Before the first start, the required operating fluids are replenished and the necessary preparatory procedures are carried out. The mechanics check fluid levels, inspect accessible connections and ensure that installation has been completed in accordance with the adopted procedure. The first start is supervised by the service team, which monitors the basic operating parameters and responds to any irregularities.
After starting, the mechanics check oil pressure, operating temperature, engine speed stability and the tightness of accessible connections. They also monitor the engine for unusual noises, vibrations or warning signals. Depending on the machine's equipment, available diagnostic messages and parameters read from the control system are checked.
Once the initial inspection is complete, functional tests of the excavator are carried out. These tests include engine operation under different conditions and its interaction with the hydraulic system, within the limits permitted by the acceptance procedure. The mechanics assess engine behaviour during basic working functions and observe its response to changes in load. The tests are conducted in a controlled manner in cooperation with the machine operator.
It is also important to recheck connection tightness after the engine has warmed up. Some leaks may only become apparent during operation. The inspection covers accessible pipes and connectors, areas of the cooling and lubrication systems, and other locations where leaks may occur. If all systems operate correctly, the service team completes the installation acceptance process and prepares a report documenting the work performed.
After the tests have been completed successfully, the Liebherr R 926 excavator can be prepared for further operation. Correct installation, thorough connection checks and testing with the operator are just as important as the engine overhaul itself. Combining workshop repairs with checks on the engine in its intended machine makes it possible to assess the outcome of the repair comprehensively.
Post-Overhaul Engine Maintenance and Operating Recommendations
The rebuilding of a Liebherr D934 A7 engine does not end when the engine is started and the excavator is handed back to the customer. Proper operation during the initial period and inspection after a specified number of operating hours are equally important. Regular maintenance helps determine whether the engine is running consistently and whether the connections and components remain in good condition after reinstallation.
WIBAKO recommends carrying out the first inspection after 50 operating hours following the engine's restart after overhaul. During this service visit, the mechanics inspect the engine, check connection tightness and carry out the required maintenance, including filter replacement in accordance with the recommendations for the specific configuration. The inspection is not limited to replacing consumables. It also aims to assess the general condition of the accessories and connections after the machine has been operating for a period of time.
The inspection after the first 50 operating hours can help identify leaks, loose mounts or other irregularities that have appeared during normal operation. The mechanics check accessible components of the cooling, lubrication and intake systems and assess engine performance. If symptoms such as increased oil consumption, reduced power, unusual noises or control system warnings occur, their cause should be investigated without delay.
Subsequent inspections should be carried out every 250 operating hours, but no less frequently than every three months, taking into account the recommendations of the machine and engine manufacturers. For excavators operating in dusty environments, under heavy loads or in difficult terrain, it is particularly important to monitor filter condition, the cooling system and intake pipes. Contamination and incorrect operating temperatures can accelerate engine wear.
The operator should pay attention to everyday signs that may indicate deterioration in the engine's condition. These include unusual noises, changes in exhaust smoke colour, fluid leaks, starting difficulties and warning messages. Reporting these symptoms early makes diagnosis easier and may limit the scope of any subsequent repair.
Proper post-overhaul maintenance complements the work performed in the workshop. Even a carefully reconditioned engine requires regular inspections, suitable operating fluids and use in accordance with the manufacturer's recommendations. As part of its construction machinery service, WIBAKO can carry out maintenance inspections and check the engine after installation, providing support after the main repair work has been completed.
Which Machines Use Liebherr D934 A7 Engines?
Engines from the Liebherr D934 A7 family are used in selected Liebherr construction machines. However, the exact configuration depends on the machine model, generation and engine version. In the case of the Liebherr R 926 crawler excavator, the engine designation and variant should be confirmed before an overhaul begins or replacement parts are ordered. The engine family designation alone may not be sufficient to identify every component correctly.
The Liebherr R 926 crawler excavator is used for earthmoving, excavation, construction site preparation and infrastructure projects. In these applications, not only engine power but also stable cooperation with the hydraulic system is important. A properly functioning engine helps maintain predictable machine performance and reduces the risk of downtime caused by engine failure.
When selecting overhaul parts, it is advisable to use the machine serial number, engine designation and identification numbers of individual components. This helps verify compatibility with the specific engine version and reduces the risk of ordering incorrect parts. This applies to piston assembly components, seals, cylinder head components and engine accessories.
For other Liebherr machines, similar engine designations should not be taken as proof that parts are interchangeable or that the maintenance requirements are identical. The configuration must always be confirmed using the relevant identification data. Correct component selection is important both for the overhaul process and for the long-term durability of the repaired engine.
WIBAKO provides support for diesel engine and construction machinery servicing. If you are planning an overhaul of a Liebherr D934 A7 engine, prepare the machine details, engine designation and a description of the symptoms. This information helps establish the preliminary diagnostic requirements and plan the next service steps.
Comprehensive Liebherr Engine Overhaul at WIBAKO
Overhauling the Liebherr D934 A7 engine in a Liebherr R 926 crawler excavator requires a combination of diagnostics, careful component inspection, appropriately selected repairs and testing after assembly. Every stage contributes to the final result. Skipping measurements or leaving a faulty component in place can lead to repeat failure, so the scope of the overhaul should be determined by the engine's actual technical condition.
WIBAKO provides services related to the repair of diesel engines used in construction machinery. The scope of work may include engine removal at the machine's location, transport to the workshop, dismantling, component inspection, reconditioning, assembly and engine dynamometer testing. After the work is completed, the engine can be reinstalled in the machine, and its operation checked during a controlled start-up and functional tests.
Post-repair maintenance is also an important part of the process. An inspection after 50 operating hours makes it possible to assess the engine after its initial period of operation, check connections and carry out the required maintenance. Subsequent inspections should then be performed according to the recommended intervals and operating guidelines.
If the Liebherr R 926 excavator shows signs of engine wear, such as reduced power, increased oil consumption, excessive exhaust smoke or starting problems, it is worth beginning with a thorough diagnosis. Identifying the cause early makes it easier to plan the repair and avoid unnecessarily expanding its scope. WIBAKO's comprehensive diesel engine service includes workshop repairs as well as support with engine removal, installation and subsequent inspection.
When preparing an engine for overhaul, it is advisable to provide the service team with as much information as possible about the machine, the history of the symptoms and any previous repairs. This helps plan the diagnostic process, verify the correct engine variant and select suitable parts. The final repair scope and the possibility of reusing individual components are determined after dismantling and carrying out the necessary measurements.
Liebherr D934 A7 Engine Overhaul and Liebherr Excavator Service
Need diagnostics, an engine overhaul or engine installation for your Liebherr R 926 excavator? WIBAKO provides comprehensive diesel engine repairs, engine dynamometer testing and mobile construction machinery service. Contact us to discuss the scope of work and find the right solution for your machine's technical condition.
