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4 PG SERIES PUMPS PT / PG / PD REPAIR<br />
4.1 Description and Operation<br />
PG Series Pumps use an impeller (1) and volute (2) to<br />
create the suction and discharge pressures required for<br />
pump operation.<br />
The impeller is threaded directly to the engine drive shaft<br />
(3) and rotates inside the volute casing. Water is drawn<br />
into the pump inlet (4) by the low pressure area created<br />
at the eye of the impeller. Vanes on the impeller move the<br />
liquid into the volute where it is gathered and directed to<br />
the discharge port (5).<br />
Clearance between the impeller and volute is maintained<br />
by the addition of shim washers (6) behind the impeller.<br />
A movable tapered ring (7) set inside the volute, can be<br />
shimmed to maintain close tolerances between the volute<br />
and impeller to maintain pump efficiency.<br />
4<br />
4-2<br />
9<br />
10<br />
5<br />
2<br />
1<br />
7<br />
6<br />
A mechanical seal (8) mounted behind the impeller,<br />
prevents water from following the engine drive shaft and<br />
seals the rear of the pump housing to prevent leakage.<br />
The flapper valve (9) at the pump inlet closes when the<br />
pump stops. This valve seals the inlet port and prevents<br />
the prime water in the suction hose from being lost.<br />
Pump case is easily filled with water by removing the<br />
priming plug (10).<br />
8<br />
3<br />
1033SD43
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