There is nothing worst than getting out on the water after a long winter and having your boat break down. One common problem that often gets over looked are the Engine and ballast impellers. MasterCraft states that Impellers MUST be changed during annual maintenance or every 100 hours, whichever comes first. This applies to both the engine and ballast impellers.
Here is a step by step guide for changing your Ballast Pump Impellers.
CHECK THE BALLAST PUMP IMPELLER
This applies only to boats equipped with some type of ballast system. The number of ballast pumps varies from system to system. You may need guidance from your Dealer to locate any and all pumps.