How to Remove Swing Reduction Gear for Doosan DX300LC Excavator

This instruction show you guide on how to remove swing reduction gear for Doosan DX300LC excavator.

Procedures:
1. Park on firm and level ground.
2. Lower front attachment (bucket) to ground.
3. Shut down engine.

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4. Set safety lever on "RELEASED" position.
5. Turn starter switch to "I" (ON) position.

6. Fully stroke work levers (joysticks) in all directions to relieve any pressure from accumulators.
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.
11. Tag and disconnect hoses from swing motor (1, Figure 3).
Plug and cap hoses and ports to prevent contamination from entering hydraulic system or component.
12. Remove drain plug (3, Figure 3) from reducer (8) and drain oil from reduction gearbox (5, Figure 3).
13. Reassemble drain plug (3) to reducer (8) and disconnect hose (2, Figure 3) from reduction gear box (5).

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14. Disconnect grease lubrication line (7, Figure 3) from reduction gearbox (5).
15. Remove twelve bolts and washers (4, Figure 3) holding swing reduction gearbox (5) to frame.
16. Using a suitable lifting device, sling swing motor (1, Figure
3) and remove swing motor and reduction gearbox (5) as an assembly from unit.
NOTE: There are two alignment pins (6, Figure 3), on reduction gearbox flange.