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PT / PG / PD REPAIR PG SERIES PUMPS 4<br />
4.10 Adjusting Impeller Clearance<br />
If it is necessary to replace impeller or volute, be sure<br />
clearance between impeller and volute is adjusted correctly.<br />
The impeller (f) should be as close to the volute<br />
(g) as possible without rubbing against it. Clearance is<br />
adjusted by adding or removing shims (h) from behind<br />
impeller. To adjust the clearance do the following:<br />
1. Remove pump housing but do not remove impeller.<br />
2. Measure the distance (j) of volute.<br />
3. Measure the distance (k) of impeller.<br />
4. Subtract the distance (k) from (j).<br />
(j) - (k) = (m) clearance.<br />
5. The clearance between the volute and the impeller<br />
should be 0.012" (0.3 mm) to 0.028" (0.7 mm). Adjust<br />
the distance by removing the impeller and adding<br />
shims as needed.<br />
Each shim measures 0.012" (0.3 mm).<br />
As the impeller wears down, additional shims may be<br />
required to maintain the clearance between the impeller<br />
and the volute. Check the clearance whenever the mechanical<br />
seal (n), impeller, volute, or rear flange plate are<br />
replaced.<br />
4.11 Storage<br />
If pump is being stored for more than 30 days:<br />
1. Remove drain plug from pump cover and drain out any<br />
water left in the housing.<br />
2. Remove pump cover and clean inside of pump housing.<br />
Coat inside of pump with a light film of oil to reduce<br />
corrosion. A spray can of oil works well for this.<br />
3. Tape up suction and discharge ports to prevent anything<br />
from falling into pump.<br />
4. Change engine oil and follow procedures described in<br />
engine manual for engine storage.<br />
5. Cover pump and engine and store in a clean, dry area.<br />
g<br />
m<br />
j<br />
f<br />
k<br />
h<br />
n<br />
1019SD91<br />
4-7
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