Hale 4DK Series - Manual (Page 33)

Manual p/n: 029-0020-79-0 33
4DK Series Pumps
Impeller Disassembly
See Figure 16: "Impeller/Mechanical Seal
Assembly."
1. Remove the pump body per preceding
section.
2. Tap out the spring pin that locks the impel-
ler nut to the pump shaft.
3. While holding the impeller with a strap
wrench, remove the impeller nut.
4. Slide impeller from the pump shaft, then
remove the impeller shaft key.
Inspection
See Figure 16: "Impeller/Mechanical Seal
Assembly."
Impeller Hub
Inspect the impeller hub(s) for signs of
wear per dimensions listed below. Re-
place impeller if hub is worn or damaged
beyond repair.
❑ New impeller hub diameter:
4.752 to 4.754" (120,701-120,752mm)
❑ Wear limits:
4.747 to 4.754" (120,574-120,752mm)
Clearance Ring
See Figure 16: "Impeller/Mechanical Seal
Assembly."
Inspect clearance ring for signs of wear.
Measure the inside diameter of the clear-
ance ring while it is pressed into the pump
head.
❑ New clearance ring diameter (pressed):
4.770" to 4.777" (121.2-121.3mm)
Figure 16: Impeller / Mechanical Seal Assembly
Spring Pin
Impeller Nut
Clearance
Ring
Impeller
Mechanical
Seal
Mechanical
Seal
Seal Spring
Pump Shaft
Pump Head
Shaft Key
Clearance
Ring