ITW Dynatec Page 9
Appendix Pumps Rev.10.15
Reconditioning
Should reconditioning (overhauling) become necessary, return the pump to ITW Dynatec.
Pump Shaft Seal Replacement
The ITW Part Number for all Tool Steel High Accuracy Pump Shaft Seals (8.5cc and
smaller) is PN 807729.
DANGER HOT SURFACE & HIGH VOLTAGE
If the pump is not operable but the heating system will function, raise the
temperature of the application system to the operating temperature to aid in the
pump disassembly process. Otherwise, a heat gun or other controlled heating
method is recommended to melt hardened hot melt material. Never use a torch or
an open flame on any of the components of the application system. Once the
system is up to temperature, disconnect all incoming power before proceeding.
Pump Shaft Seal (O-ring) Replacement:
In most cases, the pump does not have to be
removed from the ASU in order to replace the
shaft seal.
1. Disconnect the drive coupling so that the
pump may be accessed.
2. Remove the four screws in the pump “cap”
and remove the cap
3. Within the cap is the pump shaft seal.
Remove the old seal.
4. Clean all pump parts, paying particular
attention to the pump shaft seal groove.
5. Lightly lubricate the shaft seal before inserting it in the shaft seal groove.
6. Before re-assembling, wrap a small piece of paper around the shaft so that the
shaft’s woodruff key seat does not damage the new seal.
7. Re-assemble. Remove paper
8. Re-tighten four screws.
9. Re-connect drive coupling.
10. Return ASU to operation and check pump for leaks.
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