CDM6240 Hydraulic Crawler Excavator

CDM6240 Hydraulic Crawler Excavator

Construction Machinery CDM6240 features: CDM6240with strong, powerful and high quality engine and advanced negative flow control hydraulic system to achieve the best power matching and minimum costand guarantee the optimum working efficiency. CDM6240 is widely used forexcavating, handling...

    Detailed description

    Construction Machinery CDM6240 features:

    CDM6240with strong, powerful and high quality engine and advanced negative flow control hydraulic system to achieve the best power matching and minimum costand guarantee the optimum working efficiency. 
    CDM6240 is widely used forexcavating, handling and finishing of earth or stones to meet the demand of construction sites, factory, municipal engineering and park objects. With the optional bucket, the material handling, surface finishing, ditch excavation and river course cleaning can be achieved, with the optional breaking hammer, the building demolition, road surface repair and rock breaking can be achieved. The structural members are subjected to the repeated analytical calculation to ensure the rigidity and strength which can cope with the rigorous working conditions.

    Cummins 6BTAA5.9-C
    The original Cummins high power, high torque and turbo-charging 6-cylinder direct injection engine guarantees the high reliability and durability. The charge air cooling system over the compressed air can enhance the oxygen content upon combustion markedly. The center fuel injection under high injection pressure allows the uniform atomizing of fuel, guarantees the normal combustion and reduces the exhaust gas emission.

    Filtering System
    The high efficiency dual element air filter ensures the quality of engine air intake. In addition, the air pre-filter can carry out the rough filtration over the air intake to enable the operation under the poor air quality working conditions and prolong the maintenance interval of the air filter. The oil-water separator and two-stage fuel filter will filtrate the fuel many times to ensure the quality of fuel fed to the engine.

    Cooling System
    The parallel radiator cooling makes cooling effect better and service easier.

    Maintenance and Service
    The easy maintenance of direct injection engine reduces the cost of maintenance. The global after service of engine enables the sharing of global resources. This will enhance the service efficiency, relieve the customers of worry about the service and ensure the attendance rate of excavator. 

    Specialist of Engine Management
    The engine speed allows 10 adjustable gears through the throttle potentiometer and achieves the precise management over the engine speed through the control of engine throttle by the DC servo motor. The engine allows the auto idling/acceleration function to reduce the fuel consumption.It has a function of touch power enhancement, can handle the high resistance working condition with ease.

    Control Mode
    The dual pump two-circuit total power control system adopts the mature and reliable Europe and America technology to control the flow, the proportional solenoid valve regulates the two-stage pressure control of the main overflow valve. 

    This machine allows the functions of straight travel, boom/armconfluence, boom/arm holding, swing priority, swinganti-reversing and regeneration ofarm cylinder. Each circuit without interference during composite action.Digging of arm and bucket as well as the lifting and swing of boom at the same time during operating, the operations of left and right motors are independent during traveling.

    Auxiliary Hydraulic Valve
    The main valve is provided with a set of standby valves to facilitate the installation of other accessories such as the breaking hammer. 

    Filtering System
    The hydraulic circuit is equipped with the high quality hydraulic oil filter which can prolong the service life of the hydraulic elements. 

    Components Layout
    The special design of hydraulic system and components location can enhance the system efficiency of the machine. The hydraulic oil tank, main pump and main valve are arranged closely to shorten the connecting lines and consequently reduce the line friction and pressure drop. The radiator is arranged at the right side behind the cab to effectively reduce the noise, hot air and exhaust gas received by the operator. 

    Pilot System
    The pilot pump is independent of main pump and supply oil to the pilot system which guarantee the stable and independent pilot control and facilitate the maintenance.

    The multi-purpose true color monitor allows the real-time monitoring and display of machine state, engine speed, coolant temperature, oil pressure and fuel level etc. 

    Power Control Mode
    3 power modes of heavy-duty power mode (H mode), saving power mode (S mode) and light-duty power mode (L mode) can switch at will to reduce the system power loss. The combination of 3 modes can reduce the fuel consumption and better meet the different working conditions.

    Fault Auto Warning
    It allows the fault self-diagnosis auto warning display and fault message save up to 99,000 pieces approximately to facilitate the fault call and inquiry during the maintenance of equipment. There are 3 levels of warning display according to the fault severity.

    Engine Overheating Auto Protection
    The overheating protection will be active if the coolant temperature exceeds 102℃. Then the engine will not stall while the system will reduce the engine speed. However, if the coolant temperature is too high, the operator should shut down the machine as required and find out the fault causes. 

    Low Oil Pressure Protection
    When oil pressure below the standard value, the oil pressure switch will be closed, the text warning will display for 3s and then the engine will slow down to low idle speed. In such a case, the operator should shut down the machine as required. 

    Maintenance Auto Remind
    The monitor will periodically remind the operator of changing the engine oil, grease and filter element at the set interval to support the routine service.

    Main frame
    The reasonable layout of robust main frame optimizes the utilization of steels. 

    The X-shaped undercarriagewith heavy-duty box structure is subjected to the repeated finite element analytical calculation and enhance the overall rigidity, strength and torsional resistance.Undercarriage is welded from the low alloy structural steel plates with overall process quality control. The critical welds are fully subjected to fault detection and stress test to ensure the product quality. 

    There are ribs and crawler cradle in the middle of the track links. Using m-type seals to ensure the lubricating effect of the pin and pin suites. Extending the track working life effectively.

    Travel Device
    The drive unit employs the imported motors of high quality and the drive wheel adopts high frequency heating overall hardening process to enable the excellent wear resistance of the external gear rim.

    Idler Cushion
    The idler cushion with high quality sealing elements effectively guarantee the high pressure sealing inside the cylinder block, the springs are subjected to the special heat treatment to allow the excellent fatigue resistance.

    Cab Shock Absorption System
    The cab shell is installed to the platform through the cushioning materials consisting of the silicon oil and rubber to relieve the vibration, reduce the noise and guarantee the operation comfort. 

    Cab External Structure
    The roof and both sides of cab are reinforced by the steel pipes to enhance the fatigue resistance and damping capacity. The falling object protection structure is bolted to the cab front directly to facilitate removal and consequently enable the machine to adapt to the working conditions and meet the specified safety requirements. 

    The glass is clung to the cab directly without frame to enlarge the visual field. The windows allow free adjustment to open/close the front and upper window and windshield,besides, the front glass can be set to the roof above the operator. 

    Front Wiper
    The wiper located in front of cab pillar enlarges the operator's field of view, it allows the continuous and intermittent operation modes. 

    Safe and Comfortable Cab
    The left/right pillar type reinforced cab complies with 15012117 - 2: 2008 and the optional cab FOPS conforms to 15010262: 1998 to ensure the operator's safety. The 2.7m3 cab space makes the excavator operation comfortable. The reasonable layout of control elements inside the cab allows easy operation.

    Standard Cab Equipment
    The cab inside includes the cigar lighter, ash tray, cup holder, coat hook, cubbyhole and storage rack, which enhance the operation comfort. 

    A/C System
    The high performance and healthy A/C allows the air circulate. Concise control panel and easy press key operation, multi-direction A/C air outlet allowing fast regulation of cab inside temperature and fast defrosting. The fault self-diagnostics mode facilitates the A/C maintenance. 

    Deluxe Seat
    The comfortable suspension type seat is provided with a hydraulic damper, the wide seatback allows the waist support and the curve profile enables comfortable riding, the double slide track multi-way multi-step regulation enables different operators to find the best posture, the wide pedal space allows the free body stretching and relieves the operator from the long time operation fatigue. 

    Safety Lock Joystick
    The hydraulic safety lock joystick is located at the outside of center left armrest box in the cab. The machine control is active only when the joystick is in ON position, which can prevent the wrong operation in an effective way. 

    Control Lever
    The reasonable design of control lever saves the operating effort by the lever principle, the ergonomic design enables the operator to maintain the natural wrist and arm posture. The moderate joystick stroke relieves the degree of fatigue and ensures the accurate control. 

    Switch Control Panel
    The control panel on the left/right pilot box is in concise and esthetic layout and the operation of keystroke is easy.

    Boom and Arm
    To cope with high load during operation, the design & development team of LONKING adopts lots of up-to-date design ideas, preserves the higher safety factor, employs finite element analysis, calculation and optimum design to finish the development of boom and arm and selects the high strength low alloy structural steels for the boom and arm fabrication. 

    Pin Shaft
    The pin shaft is the core element for the connection of the working equipment. LONKING chooses the professional pin shaft suppliers and subject the pin shafts to the strict fault detection to ensure the quality. The pin shaft of LONKING excavators has thick chrome plating coat and high surface finish.The special treatment enables the extremely high wear resistance and corrosion resistance.

    The bucket body is made of low alloy and high tenacity materials and the external structure is made of high strength and wear-resistant steels, which constitute the entire reinforced bucket. This excavator provides different bucket options to meet different working demands. 

    Easy Maintenance and Service
    The design and layout of CDM6240consider to providing convenience for maintenance personnel. Most maintenance locations can be accessed from the ground level to enable the fast and high efficiency maintenance. 3 side doors can be opened during the routine inspection and maintenance and each service point is within the easy reach. The maintenance points are clearly identified, easy to operate. The electrical elements are centralized in the electromechanical control box in the cab to facilitate the maintenance. 

    Long Maintenance and Service Cycle
    The maintenance and service cycle has been prolonged to reduce the maintenance parts collection and enhance the availability.





    Cummins6BTAA5.9-C (Tier 2,standard)

    Rated power

    133kW (178hp) /2000 rpm

    Max. torque

    708N.m/1500 rpm

    Bore× Stroke



    5.9 L


    Maintain the rated power at 2300m elevation.

    Operating weight


    Operating weight:22000kg
    The operating weight includes the weight of 5700 mm standard boom,2900 mm standard arm,1.16m3 standard bucket,600 mm track shoes, lubricating oil, coolant,the full diesel oil tank and the rest standard configuration units.

    Ground pressure

    45 kPa (Lengthened type:50 kPa)

    Fluid capacity

    Fuel tank

    350 L

    Cooling system

    23 L

    Engine oil

    18 L

    Swing drive unit

    3.8 L

    Traveling gear

    2×3.3 L

    Hydraulic oil tank

    220 L

    Swing mechanism

    High torque plunger motor and 2-stage planetary reducer drive.Brake inside loading motor is applied by spring and released by hydraulic unit. The automatic braking is available when the swing control lever is in neutral position.

    Swing speed :12.1 rpm
        (Lengthened type:8 rpm)

    Travel drive


    The integrated 2-speed plunger hydraulic motor and reducer drive, motor and hydraulic pipeline are arranged inside the  track frame to prevent the damage caused by the rugged road surface; The motor inside is provided with the service brake and shock absorption valve to ensure the smooth running and stop and the reliable braking.

    Taveling speed

    3.0 - 5.1 km/h




    222 kN

    Traveling mechanism

    Standard track shoe width

    600 mm

    No. of track shoe

    49 (each side)

    No. of carrierrollers

    2 (each side)

    No. of track rollers

    9 (each side)

    Hydraulic system

    Main pump

    Duplex axial variable plunger pump

    Pilot pump

    gear pump (integrated in main pump)

    Max. flow of system

    2×217 L/min

    Max. pressure of equipment

    34.3 MPa

    Max. pilot pressure

    4.9 MPa

    Operating equipment

    Each machine action is under the pilot control. The right lever controls the motion of boom and bucket while the left lever controls the arm motion and upper structure swing. The foot pilot valve is provided with the lever joystick to control the machine traveling or turning by the foot or lever. The traveling gear shift adopts the solenoid switch control.

    Electrical system

    System voltage:24 V
        Battery:12 V,120 A×2

    Transport Size
    The following sizes approximate to that of the equipment of standard configuration.

    Working Device type


    Long Reach

    Boom Length (mm)



    Arm Length (mm)



    a Transport length(mm)



    b Total transport height(mm)



    c Tumblers distance (mm)


    d Tail slewing radius(mm)


    e Counterweight ground clearance(mm)


    f Track gauge(mm)


    g Total transport width(mm)


    h Upper structure width(mm)


    i Standard track shoe width(mm)


    J Min. ground clearance(mm)


    Operating Range
    The following sizes approximate tothat of the equipment of standard configuration.

    Working Device type


    Long Reach

    Boom Length (mm)



    Arm Length (mm)



    aMax. digging radius(mm):



    b     Max. digging depth(mm):



    c     Max. digging height(mm):



    d     Max. dumping height(mm):



    e     Max. digging radius on ground(mm):



    Max. bucket breakout force-ISO(kN):



    Max. arm breakout force-ISO(kN):



    Standard Equipment
    The following equipment items are part of the whole standard equipment of CDM6240. In addition, the standard configuration will change along with the product modification. For more information, contact the local LONKING agent.

    50 A alternator

    Aerial and harness (excluding radio speaker)

    Platform working lamp (1)

    Suspension type adjustable seat

    Boom working lamps (2)

    Retractable seat belt (2" width)

    Refuelling pump

    Ash tray and cigar lighter


    Cup holder

    Original Cummins engine

    A/C system allowing fast defrosting

    Radial seal air filter

    Hydraulic safety lock joystick

    Air prefilter


    Oil-water separator

    File pocket

    Fuel filter

    Hat-and-coat hook

    Rippled wall radiator with cleaning space

    Left/right side storage

    High-volume fuel tank

    Interior lighting equipment

    Auxiliary hydraulic valve (1)

    Double stereo speaker

    Auto swing parking brake

    Openable skylight

    Boom/Armholding control function

    Wiper and washer


    Cab positive pressure filtration and ventilation system

    Top bonnet

    Rear window (escape exit)

    Gate lock and cover lock

    Escape hammer

    A/C stationary condenser

    Washable rubber floor mat

    Arm re-activation circuit

    Fire extinguisher


    Color graphic display

    Straight travelling hydraulic circuit

    Economic mode selection

    Double speed travel

    Date and time display

    Front idler and idler cushion

    Machine state display

    Trailer ring on base frame

    Working hour display, maintenance remind

    Chain guard rack

    Current engine speed display

    Adjustable seat armrest

    Warning message

    Optional Equipment 
    The optional equipment may be different from this manual. For more information, contact the local LONKING agent.


    Operating console


    Auxiliary hydraulic unit and pipeline

    Loose material bucket 1.2m³、Loose material bucket 1.35m³

    Working warning lamp

    700mm triple grouser shoes

    Breaking hammer pipeline

    Cab roof protecting net

    800mm triple grouser shoes

    Hydraulic breaking hammer

    Cab front protecting net

    Track rubber block

    Travel warning device

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