Fitting Impeller And Pump Housing - Grundfos DPK Service Instructions Manual

6.5 Fitting impeller and pump housing

Fig. 13 Impeller and pump housing assembly and impeller clearance
1. Fit and lubricate the O-ring (37 or 39) on the pump housing
(50).
2. Fit the pump housing (50) and tighten the screws (184)
according to torques in the table in section
torques.
3. Fit spacer rings (49a) to the shaft.
4. Fit the key (9a) in the shaft.
5. Fit the impeller (49) on the shaft and tighten the nut (188)
according to torques in the table in section
torques.
6. Fit the inlet cover (189) to the pump housing and tighten the
screws (188a) according to torques in the table in section
3. Tightening torques.
7. Check the impeller clearance. See fig. 13. The impeller
clearance must be between 0.3 and 0.5 mm. If the impeller
clearance is outside this range, dismantle the impeller and
add or remove spacer rings to obtain the right clearance. Then
check the clearance again.
8. Fit the inlet strainer or ring stand (84a) and tighten the screws
(35) according to torques in the table in section
torques.
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3. Tightening
3. Tightening
3. Tightening