How to Troubleshoot the Problem That the Coolant Temperature of the Excavator's Electronically Injected Diesel Engine is Too High

1. Cause of failure  

(1) The radiator fins are dirty, debris or damaged. 

 (2) Insufficient coolant. 

 (3) The radiator cap or pressure relief valve is damaged.  

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(4) There is air in the cooling system.

 (5) The cooling fan is not working properly and the fan belt is too loose.  

(6) The thermostat is damaged. 

 (7) The cooling system pipeline is blocked or leaking. 

 (8) The coolant temperature gauge is damaged. 

 (9) The water pump impeller is damaged or corroded.

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2.Fault  

(1) Visually inspect the cooling system for broken hoses or other throttling components. 

 (2) Check the radiator fins for dirt, debris and damage. Remove dirt and debris, clean and flush the radiator, and straighten any bent fins. 

 (3) Check the coolant level and add coolant if necessary.

  (4) Check whether the cooling system is leaking and repair the leaking area immediately. 

 (5) Check the cooling system pressure. 

 (6) Check the pressure relief valve and radiator cap. Clean and replace parts if necessary. 

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 (7) Check whether the seat surface of the pressure safety valve and the radiator cover are clean and damaged. 

 (8) Check whether there is combustion gas in the cooling system and whether there are bubbles in the coolant. If there are bubbles, combustion gases may have entered the cooling system.  

(9) Check whether the cooling fan is working normally. Check that the belt and pump are working properly.  

(10) Check whether the thermostat is operating correctly. If necessary, replace the thermostat.  

(11) Compare the coolant temperature reading from the ET to the coolant temperature reading from the mechanical measuring instrument. 

(12) Check whether the water pump impeller is damaged or corroded. Repair or replace water pump if necessary.  

(13) Check whether the fault is caused by system overload, reduce the load and check whether the condition recurs.

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How to Disassemble Cummins Engine Turbocharger and Oil Return Pipe

How to disassemble cummins M11 engine turbocharger and oil return pipe

 ① Remove the oil supply pipe and sealing gasket from the top of the turbocharger, remove the other 

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end of the oil supply pipe from the oil filter seat, and then remove the oil return pipe and sealing gasket 

from the bottom of the turbocharger, see Figure 2-22. 

 ② Remove the V-shaped clamp, exhaust elbow and O-ring from the exhaust port of the turbocharger 

compressor, remove 4 mounting nuts, remove the turbocharger and gasket, and block the supercharger

  For the oil supply hole and oil return hole, see Figure 2-23. 

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 ③ Remove the turbocharger oil return pipe joint, see Figure 2-24.

 

How to Solve the Problem of Doosan Excavator Turning to the Right Slowly and Unable to Brake

 How to solve the problem of Doosan excavator turning to the right slowly and unable to brake

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 Applicable models: All models Phenomenon: The turning speed and braking to the left are normal, but the turning speed to the right is slow and the car cannot be braked.

 

1. Inspection essentials: 

  A. The one-way rotation is normal to eliminate the problem of the main pump. 

  B. Check the pressure during rotation overflow, which is 285BAR to the left and 190BAR to the right,

 which is lower than the standard value of 280BAR.  

C. Adjusting the left and right rotation relief valve has no effect, indicating that it has nothing to do 

with the relief valve. 

  D. Check the oil supply one-way valve on the right side of the rotary motor and find that the one-way

 valve is stuck in the normal position. Take out the one-way valve and grind it. After installation and 

test run, it is normal.

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 2. Cause: The one-way valve is stuck in the normal position, causing a large amount of hydraulic oil 

leakage in the right chamber, resulting in low pressure and slow speed. 

  3. Treatment method: Take out the stuck one-way valve and grind it, OK

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How to Deal with The Oil Leakage Problem of Doosan Excavator Cylinder Oil Seal

How to deal with the oil leakage problem of doosanDH220LC-V excavator cylinder oil seal

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Applicable to all models 

  Phenomenon: The oil seal of the hydraulic cylinder leaks oil and causes serious pollution. 

1. Inspection essentials: disassemble and inspect the oil seal of the cylinder and analyze the damage of the oil seal:  

 A The oil seal is blackened, loses elasticity, and is severely carbonized. 

 

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  B. The oil seal has one or several scratches, and oil leaks from the scratches. 

  C. The oil seal circumference is damaged in a large area, and the cylinder rod is seriously scratched.

 

 

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2. Reason A. The air in the cylinder is not evacuated before operation, and high temperature is generated under the action of high pressure, resulting in carbonization of the oil seal. 

  B. There are debris particles in the cylinder, which will scratch the oil seal and cylinder rod.

  C. The oil seal is damaged due to severe scratches on the cylinder rod.

3·Processing method: 

  A. Replace the oil seal; avoid violent and large-scale operations before the oil cylinder moves, and try to exhaust the air in the cylinder rod as much as possible. 

  B. Replace the oil seal with a new one to ensure the quality of the hydraulic oil and keep the hydraulic system clean. 

  C. Replace the scratched cylinder rod and oil seal.

    

How to Solve the Problem of Doosan Excavator Traveling Motor Not Moving

 Doosan Excavator DH220LC-V walking motor has no action  

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A  Phenomenon:

 1 There is no movement when walking on the right side, but the 1st and 2nd speeds of walking on  

 the    left side are normal;  

 

 

2  Other actions are normal. 

 

3 The idle pressure for right walking is 38 kg, the pressure during movement is about 60 kg, and the pressure for other movements is normal. 

 

     

 

 

 

 B  Inspection essentials: 

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  1. Check the pilot oil pressure; 

  2. Check whether the main valve core is stuck; 

  3. Whether the rear pump is damaged; 

  4. Is there any abnormality in the traveling straight valve core? 

  5. Check whether the CTS one-way valve is damaged; 

  6. Whether the motor relief valve is damaged; 

  7. Check whether there is any damage inside the motor; 

 

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  C  reasons:  

   The central shaft spring snap ring inside the walking motor falls off 

  D Processing method: Replace the spring circlip and reinstall the traveling motor OK

How to Deal with The Problem of The Whole Machine Shaking When the Doosan Excavator Rotates and The Bucket Arm Works

 How to deal with the problem of the whole machine shaking when the doosanDH220LC-V excavator rotates and the bucket arm works  

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1. Inspection method:  

   A. First analyze whether the cause of the jitter is mechanical jitter or hydraulic jitter. The mechanical 

cause is mainly the jitter caused by the internal breakage of the rotary reducer or the oil cylinder. After 

checking that the parts are normal and have no damage, mechanical jitter can be ruled out. Normally, 

the negative control pressure is measured during rotation and stick action. The pressure during wide-

center action is 6 BAR. The neutral pressure is 40 BAR. Normal.  

 

B·Check that the overflow pressure during rotation is 285 BAR and the bucket arm overflow pressure is 332 BAR. 

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  C. According to the analysis, because two actions vibrate at the same time, it can be basically 

concluded that the problem lies in the main pump. Damage to the pump's plunger, sliding shoe, etc. 

will 

cause the actions associated with the pump to vibrate, and some actions do not feel right. obvious. 

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 2. Reason: After dismantling and inspecting the main pump, a crack in the sliding shoe was found, 

       which caused excessive leakage of the plunger and caused working jitter. 

 

 3·Processing method: Clean the main pump and replace the corresponding accessories OK

How to Deal With the Problem That the Rollers on The Doosan Excavator Do Not Rotate and The Parts in Contact With the Tracks Are Abnormally Worn.

 How to deal with the problem that the rollers on the doosan DH55-5 excavator do not rotate and the parts in contact with the tracks are abnormally worn. 

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  A. Inspection essentials  

1.Construction environment Swamps, water conservancy projects, dredging and other construction sites are relatively soft environments.  

2.Fault situation a. The upper roller hub does not rotate and the contact position with the crawler track is abnormally worn. b. The failure occurred again within a short period of time after replacing the rollers.  

3. Determine the fault During the inspection, it was found that the construction environment of the equipment was soft, and the chassis parts were basically covered by soft soil or attachments, causing the rollers to be unable to rotate normally due to large external forces during operation.  

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B. Reason: The construction environment is soft, and the chassis parts are basically covered by soft soil or attachments, causing the supporting wheels to be unable to rotate normally due to large external forces during operation. 

  C. Treatment method: During construction, clean the attachments on the chassis in time.

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