Chapter 7
Maintenance and Repair Notes
DM55 DynaDrum PP V6, Manual No.21-18, Rev.2.19 Page 121
9. From the top of the pump and while the shaft is still hot and any adhesive still molten,
gently push the pump shaft assembly (Item 23, PN 114306) out through the bottom of
the pump, taking care not to touch the seal pack with the shaft threads. Disassemble
the outlet check valve (piston assembly) by unscrewing the outlet check seat (piston)
from the shaft using a 1-1/16” (27mm) wrench on the piston and a 20mm wrench on
the pump shaft.
DO NOT hold the shaft by its diameter.
The shaft is super-finished and must not be scratched or marred in any way or pump
shaft seal leakage will occur. The outlet check seat (piston) is held in place by an O-
ring (Item 43, PN N01601). Inspect the O-ring and replace if necessary.
10. Using C-clip pliers, remove the internal retaining clip (Item 42, PN 114351) above
the shaft seal housing (Item 2, PN 114281). Using a plastic or wooden rod, insert rod
into the bottom of the pump and tap the bottom of the shaft seal housing (Item 2, PN
114281) and remove from the top.
11. Using C-clip pliers, remove the internal retaining clip (Item 5, PN 113738) holding the
pump seal spacer, seal and shaft bearing in place. Remove the pump seal spacer
(Item 4, PN 113737) and shaft seal. Using the wooden rod from the top, tap the shaft
bearing (Item 3, PN 114282 contains both the seal and matching bearing) out of the
bottom, being careful not to damage the housing. Clean the pump housing internally
and inspect for wear or damage inside.
12. Replace with a new shaft bearing and seal, taking care to make sure the seal-
loading spring is facing down in relation to the pump. Reinstall the spacer and
retaining ring. Re-install the shaft seal housing assembly into the pump body and
reinstall the retaining ring.
13. Tape the threaded end of the pump shaft and carefully reinstall the pump shaft with
outlet check assembly into the bottom of the pump and through the seal assembly,
taking care not to damage the pump seal.
14. Re-install the inlet check valve assembly, tie rod plate, bearing lock washer and
bearing lock nut. Tap the lock nut 1/8 turn past hand tight and bend at least one tang
on the bearing lock washer into one of the recesses in the bearing lock nut to
secure.
15. Re-install the outlet manifold assembly.
16. Re-install pump into the platen assembly.
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