This article introduces the disassembly of Doosan DX340LC-5 excavator swing reduction gear

1.       Park on firm and level ground .     

2.       Lower front attachment ( bucket ) to ground .    

3. Shut down engine .        

4. Set safety lever on " RELEASED " position .          

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5. Turn starter switch to "I" ( ON ) position .           

6.       Fully stroke work levers ( joysticks ) in all directions to                 

relieve any pressure from accumulat ors. 

7. Set safety lever on " LOCK " position .           

8. Turn key to "O" ( OFF ) position and remove from starter             

switch.

9.       Hang a maintenance warning tag on controls .      

10.     Disconnect negative  (-) battery cable leading to frame from      

battery.

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11.    Tag and disconnect hoses from swing motor (1, Figure 3 ).         

Plug and cap hoses and ports to prevent contaminat ion         

from entering hydraulic system or component.  

12.     Disconnect tube (2) from drain cock (3) and hose fitting (7)         

from fill hole. 

13.     Remove twelve bolts and washers   (4, Figure 3 )   holding     

swing reduction gearbox (5) to frame .    

14. Using a suitable lifting device, slingswing motor (1, Figure     

3 )andremoveswingmotorandreductiongearbox(5)as         

an assembly from unit. 

NOTE :       A drain cock (3 , Figure 3 ) and tube are on side         

of gearbox. Be careful not to damage valve or       

tube .

NOTE :       There are two alignment pins (6 , Figure 3 ), one        

on each side of reduction gearbox  

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