Chapter 7
Maintenance and Repair Notes
DM55 DynaDrum PP V6, Manual No.21-18, Rev.2.19 Page 119
7.8 Piston Pump Assembly Replacement
Heed all security advices given in chapter 7.1.
Maintenance and repair work is only permitted for skilled personnel!
Always wear safety shoes, heat-resistant protective gloves, safety goggles and
protective clothing that cover all vulnerable parts of the body while working on
the heated unit! Risk of injury or severe burns!
Prior to disassembly:
• Heat the unit above the softening point of the material being pumped by the unit.
• Switch pump motor OFF.
• Activate the applicator to relieve pressure.
• Elevate the platen to full UP position to make work easier.
• Disconnect main electrical power.
• Disconnect air pressure at air control panel.
• Provide safety blocking under the platen.
Place safety blocking (lid and fiber separator sheet between the lid and platen)
under the platen to prevent platen lowering of platen.
Disassembly and replacement:
1. Loosen alignment coupler and swing the stainless steel connection shaft up clear of
the pump. Remove coupling from top of connection shaft.
2. Remove four pump air motor bracket bolts.
3. Remove four bolts which mount the pump to the platen cover. Remove the pump.
WARNING HOT SURFACE & HOT ADHESIVE
Hot, molten material may flow from the pump.
CAUTION: For high viscosity materials, it may be necessary to heat the
platen to full operating temperature. The high viscosity material may
make the pump difficult to remove.
4. After the pump is removed, use a clean, soft cloth to wipe all the material out of the
pump cavity.
5. Inspect the O-rings on the end of the pump.
6. Prior to installation of the new pump assembly, remove and inspect the pump adapter
O-rings. When installing new O-rings, liberally coat the pump adapter sides with
lubricant.
7. Re-install the pump assembly in reverse order of disassembly outlined above.
Observe the “arrows” stamped on the pump adapter that show in which direction
8. Pump replacement is now complete. Prior to startup, read startup instructions in
Chapter 5.
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