LONKING Brand Hydraulic Excavator CDM6240

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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. 





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):



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