Dipper door assembly

A camshaft support assembly for a shovel dipper, comprising:

• a bearing block coupled to the shovel dipper and having a socket configured to receive a rotatable bearing member;
• a rotatable bearing member received by the socket of the bearing block and having a bore configured to receive a camshaft, the camshaft having a cam configured to release a dipper door on the shovel dipper;
• and
• a sealing mechanism positioned between the bearing block and the rotatable bearing member, and configured to provide a seal between the bearing block and the rotatable bearing member.

A trip assembly for a shovel dipper having a dipper door, comprising:

• a camshaft having a cam configured to release the dipper door;
• a trip arm having a first end coupled to the camshaft and a second end configured to be coupled to a trip rope, the trip arm configured to move in response to a force applied by the trip rope, thereby rotating the camshaft and cam, and allowing the dipper door to open;
• a Y-shaped link having a first end coupled to a connector by a first pin assembly, and having a second end coupled to the trip arm by a second pin assembly;
• wherein the connector comprises a wire rope connector and has a first end coupled to the Y-shaped link and a second end configured to be coupled to the trip rope;
• wherein the Y-shaped link comprises one or more hardened bushings configured to receive the first and second pin assemblies.