Section 6 - Maintenance MC122 - MCP-4J Control Unit
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Flushing the Glue System
To flush the glue system, follow these steps:
Follow the procedures for your system. These are general
guidelines only.
1. Turn on the tank and any hoses or valves that are to be cleaned.
2. Pump out the old hot-melt adhesive, and then fill the tank with hot-melt purge. Allow it to heat to at least
350 degrees F.
If you use glue that operates at 250 degrees F, the tank only
needs to be heated to the standard operating temperature.
3. Once the tank is molten, turn on the pump and engage the valves.
4. Flow the old adhesive and purge through the valves until only purge is extruding from the valves. When
you reach this point, turn the system power OFF and remove air from the pump.
5. Next, remove the lid cover screws on the surface of the melt unit. This allows you to remove the pump
and heating grid from the tank itself.
6. Once the screws are removed, use gloves to lift the lid and pump assembly out of the molten tank.
7. Place the lid and pump assembly in a vertical position on a clean, solid, flat surface and allow the
excessive adhesive to slowly drip off of the fins.
8. Take the pot, lifting from the edges, and pour the molten material into a sealed corrugated box.
9. Use a clean rag to wipe the tank clean thoroughly and dispose of the rag. Now, you can re-insert the lid
and pump assembly into the pot and tighten the lid cover screws. This completes the “clean and flush”
process.
Lubricating the System
To lubricate the system, follow these steps:
1. Use lithium grease on all machined threads and fittings when servicing the system.
2. Grease quick-disconnect fittings frequently to prevent dried glue from causing excessive wear.
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