Remember, there are two main Alpha Models out there. Alpha I-R which uses plastic pump housing and a "Stiff Vane" impeller which should be replaced every 2-3 yrs. This drive was used till 1991. Then there is the Alpha I-MR which is still used. This drive has a completly different pump with a metal housing and a "Flopy Vein" impeller. Some manuals list this as a lifetime impeller but still should be checked whenever drive is dissembled for any reason...either way you still should have a service manual of some kind before doing work.
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