Attention Customers – Seal Solution Now Available. We've found a common issue with leaking drive motors on Chinese excavators, especially the MX12R model with a BMER motor. The seal, sized 38.1 x 51.1 x 4.6, is the culprit. We're excited to introduce our 38.1 x 51.1 x 4.6 seal. In stock Now. Call to Order.