How to Disassembly Swing Motor for Doosan 300LC Excavator

June 06, 2024

This instruction show you guide on how to disassembly swing motor for Doosan 300LC excavator.

Preparations;

Doosan Diagnostic Tool

Doosan DMS-5

Doosan Diagnostic Software

Steps;

1. Remove hex socket head bolt and disassemble time delay valve assembly, beginning with rear cover (19).

2. Remove rear cover from body (1) by removing hex socket head bolt (23) of its assembly with impact.

3. Remove brake piston assembly from body (1) using jig.

4. Remove cylinder block assembly, friction plate (14), and plate (15) from body (1).
NOTE: Pay attention to order of plates and friction plates.

5. Remove O-ring (38) from body (1).

6. Remove shoe plate (8) from body (1) using jig.

7. Remove retaining ring (4) from body (1) using retaining ring pliers.
8. Turn body over, and separate shaft assembly using steel bar.

9. Separate piston assembly (13) from cylinder block assembly.

10. Remove friction plate (12), plate (15), ball guide (11), and spring (10) from cylinder block.

11. Separate valve plate (22) from rear cover (19).

12. Remove O-ring (17) from rear cover (19).

13. Remove two relief valve assemblies (33) from rear cover (19).

14. Remove check valve assemblies from rear cover (19) with L wrench, and disassemble it in order of plug (26), spring (23), and poppet (24).

15. Remove plug (29) from rear cover (19) with L wrench and disassemble it in order of backup ring (50), O-ring (49), Oring (48), spring, and anti-inversion valve assembly (28).

16. Remove plugs (36 and 37) from rear cover (19) with L wrench