LONKING Hydraulic Excavator CDM6225


Construction Machinery CDM6225 features:

CDM6225 with 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.
CDM6225 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 3 s 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 CDM6225 consider 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 of CDM6225 has been prolonged to reduce the maintenance parts collection and enhance the availability.




Specifications CDM6225
Engine Model Cummins 6BTAA5.9-C
Rated power 133kW (178hp) /2,000 rpm
Max. torque 708N.m/1,500 rpm
Bore×Stroke 102mm×120mm
Displacement 5.9 L
Comment Rated power maintained at 2,300m elevation.
Operating weight Summary Operating weight: 22,100kg. The operating weight includes the weight of the 5,700mm standard boom, 2,900mm standard arm,
1.1m3 standard bucket, 600 mm track shoe, lubricating oil, coolant, the full fuel tank and the remaining standard configurations.
Ground pressure 45 kPa
Fluid capacity Fuel tank 350 L
Cooling system 23 L
Engine oil 18 L
Slewing gear 3.8 L
Traveling gear 2×3.3 L
Hydraulic tank 220 L
Slewing mechanism Summary High torque plunger motor and double planetary reducer drive. The brake inside the loading motor is applied by spring and released by
hydraulic unit. Automatic braking is available when the slewing control lever is in the neutral position.
Slewing speed 12.1 rpm
Travel drive Summary The integrated 2-speed plunger hydraulic motor and reducer drive, motor and hydraulic pipeline are arranged inside the track frame
to prevent damage caused by rugged road surfaces. The motor inside is provided with the service brake and cushion
valve to ensure smooth running and stopping as well as reliable braking.
Traveling speed 3.0 – 5.1 km/h
Gradeability 35° (70%)
Max. traction 222 kN
Traveling mechanism Standard track shoe width 600 mm
No. of track shoes 49 (each side)
No. of carrier rollers 2 (each side)
No. of track rollers 9 (each side)
Hydraulic System Main pump Two-stage axial variable plunger pump
Pilot pump Gear Pump (integrated into main pump)
Max. flow rate 2×217 L/min
Max. pressure 34.3 MPa
Max. pilot pressure 4.9 MPa
Operating equipment Each machine action is under the driver’s control. The right lever controls the motion of the boom and
bucket while the left lever controls the arm
motion and upper structure slewing. The foot pilot valve is provided with the lever joystick to control
the machine’s traveling and turning by
foot or lever. The traveling gear shift utilizes 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.

Boom Length (mm) 5,675
Arm Length (mm) 2,920
a Transport Length (mm) 9,459
b Total Transport Height (mm) 3,200
c Distance between Tumblers(mm) 3,462
d Tail Slewing Radius (mm) 2,750
e Counterweight Ground Clearance (mm) 1,061
f Track Gauge (mm) 2,200
g Total Transport Width (mm) 2,809
h Upper Structure Width (mm) 2,740
i Standard Track Shoe Width (mm) 600
J Min. Ground Clearance (mm) 478
Cab Height (mm) 2,980
Operating Range
The following sizes approximate tothat of the equipment of standard configuration.
Boom length(mm) 5,675
Arm length(mm) 2,920
A Max. digging radius(mm) 9,879
B Max. digging depth(mm) 6,570
C Max. digging height(mm) 9,292
D Max. dumping height(mm): 6,651
E Max. digging radius on ground(mm) 9,738
Max. bucket breakout force-ISO(kN) 158
Max. arm breakout force-ISO(kN) 105
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