Burks Pump 3CR6M Parts Breakdown, Exploded View Diagram & CR Series Close Coupled Turbine Pumps Repair Parts PDF Manual. Repair Kit 22850-6 Available - Includes: Impeller (SA21723-6-1), Raceway (21722-6), Shaft Seal (21727), Impeller Locknut (21725), Shaft Key (21728), Seal Ring (21726), Washers, (03520/22897/23037) & Instructions.