What Is Inside a Kit
Rotor, cam ring, vanes, port plate, pressure plate and pins, supplied assembled. Those are the parts that wear. The housing, shaft, bearing and cover normally survive several cartridge changes.
When a Kit Is the Right Repair
Fit a kit when delivered flow has dropped but the housing bore and cover face are not scored, the shaft turns without play and there is no external damage. If the housing is scored, oil will bypass around the new cartridge and the repair will disappoint.
When To Buy the Complete Pump Instead
A cracked or scored housing, a worn bearing bore, a damaged mounting flange or a shaft with visible play all point to a complete pump. So does a pump that has run with no oil, because heat damage is rarely confined to the cartridge.
Fitting Without Repeating the Failure
The debris that killed the first cartridge is still in the reservoir. Flush the tank, change the pressure and return filters, clean or replace the suction strainer and check the breather. This is the single largest factor in how long the repair lasts.
Matched Kits Against Loose Parts
A cartridge is a set of parts that run against each other. Buying a rotor from one source and a cam ring from another leaves you matching them yourself on the bench, and the results are unpredictable. Our kits are assembled and matched before they are packed.
Ordering the Right Kit
The displacement digits in the pump model code identify the kit. On a double pump there are two. Photograph the nameplate and send it to us, and we will confirm which kit or kits you need in writing.
