Mitsubishi Self-Check Dorjee Series: Disassembly and Assembly Procedure

Introduction

• Overview of the self-check Dorjee series and focus on the bowl disassembly and assembly process.

Disassembly Procedure

Step 1: Disconnecting Pipes

• Disconnect connecting pipes (may vary by supplier).
• Remove the plug to release oil from the piping.
• Use a hook snapper to remove cap nuts from:
  • Dirty oil inlet
  • Heavy liquid water inlet
  • Light liquid outlet pipes
• Loosen lower cap nuts horizontally.
• Be cautious of electrical wiring if the outlet pipe has a pressure sensor.
• Take care not to lose the orifice for flow measurement on the inlet pipe.

Step 2: Removing Cover Nuts

• Loosen and remove cover nuts with a wrench.
• Remove hexagonal nut retaining the inlet pipe.
• Loosen socket set screws on the upper hood.
• Tap the top of the inlet pipe gently with a plastic hammer.

Step 3: Lifting Sludge Cover

• Loosen socket fasteners on the sludge cover.
• Attach lifting jack to the upper hood and slowly lift the sludge cover with a chain block.

Step 4: Disassembling the Bowl

• Loosen disk nuts using the disk nut handle.
• Remove disk nut, heavy liquid chamber, heavy liquid impeller, Teflon packing, and gravity disk.
• Consider replacing the gravity disk.
• Remove light liquid chamber using the light liquid chamber handle.
• Complete top of bowl disassembly by removing the light liquid impeller and inlet pipe.

Step 5: Removing the Bowl

• Insert cap nut spanner into the bowl and screw release bolts into cap nuts.
• Loosen and remove cap nuts using the spanner.
• Attach the bowl lifting jack to guide tubes and tighten.
• Bowl should float up; if not, use pipe in handle to tighten more.
• Slowly lift the bowl to remove from self-check unit.
• Place the bowl on the disassembly stand, aligning pins with grooves.

Step 6: Securing the Bowl

• Remove bowl lifting jack.
• Set disk clamp plate and fasten with push bolts and hexagonal nuts.
• Important to prevent springing effect in the disk.
• Tap the bowl nut handle to aid in removal of the bowl nut.

Final Steps in Bowl Disassembly

• Remove bowl nut and disk clamp plate.
• Set patch on distributor and prepare for removal.
• Remove distributor, top disc, and disks, ensuring no metal/sandpaper is used for cleaning.
• Soak disks in cleaning oil/detergent and clean with soft utensils.

Main Cylinder Handling

• Remove main cylinder using push bolt and handle.
• Fasten main cylinder onto bowl head, ensuring care with parts during handling.
• If the main cylinder does not operate correctly, inspect and clean pilot valves.

Pilot Valves Disassembly

• Remove pilot valves using a hexagonal wrench.
• Tighten butterfly nuts to release pilot valves carefully without damaging parts.
• Inspect and clean o-rings; replace if necessary.

Cleaning and Reassembly

Main Seal Ring Cleaning

• Heat packing remover to melt off packing without damaging the main seal ring grooves.
• Clean thoroughly before mounting the new main seal ring.
• Align and gently insert the main seal ring, ensuring it's fully driven in.

Conclusion

• Disassembly of the bowl is now complete except for the drink.