Doosan DX300LC Excavator Center Joint Swivel Disassembly

This instruction show you guide on how to perform flow meter and kit installation and test for Doosan DX300LC excavator.

Procedures:
1. Clean off the exterior of the swivel joint after it has been removed.
2. Scribe or otherwise mark a line across the cover and the body of the center joint, to allow reassembly in the same configuration.Doosan DMS-5 Diagnostic Software
3. Unbolt the four 12 mm fasteners holding the cover. Use a vise or V-block to hold the assembly in place.

4. Remove the cover, withdraw the O-ring and remove the retaining ring holding the thrust plate, taking care to support the spindle assembly, so that it will not separate and fall out when retaining ring is removed.
5. If the spindle assembly doesn't separate easily when the thrust plate and retaining ring are removed, use a wooden block and hammer to drive it out of the housing.
6. O-rings and seals should be replaced whenever the assembly is being overhauled or rebuilt. For repair procedures or emergency tear down, use a thin but rounded tip, smooth edge scraper or spatula to remove Orings or seals, to avoid causing damage to those that must be reused.

Doosan EPC
NOTE:The "backup ring" shown in the assembly drawing (above the swivel joint spindle lower seals) should not be overlooked. It is tucked behind the top slip ring, doubled up inside the same groove in the body of the spindle.

7. Before reassembling the center swivel, visually inspect ball bearing surfaces for visible signs of wear, damage or discoloration and replace any worn component.
Check clearance between the spindle and thrust plate.

Replace any component that shows more than 0.5 mm (0.020") of visible wear.
Clearance between the spindle and body of the center swivel must be tight. Replace or repair either component if there is more than 0.1 mm (0.0039") of measurable wear.
1. Prelubricate O-rings with hydraulic oil, white grease or petroleum jelly.
2. Thoroughly clean all other component surfaces of dirt or grease before reassembly.
3. Reverse disassembly steps for reassembly.
4. Clean threads of fasteners before preapplying Loctite #243 to the threads, and before torquing the thrust plate and cover bolts.
5. Prefill the center swivel with clean hydraulic fluid before reassembly of high-pressure and drain line piping. Clean and prefill piping line ends to reduce the amount of air in the system. Bleed air from the hydraulic system and verify hydraulic tank fluid level before returning the excavator to service.https://www.car-auto-repair.com