|  1. Disconnect a power shaft from a transmission. | 
   | 2. An edge of a flat screw-driver remove a sealing ring from a transmission nest. | 
    Prevention 
 Clear a nest of a sealing ring and put on it a thin butter layer    | 
 
 | 3. Using an opravka 09431–21200, establish a new sealing ring in a nest of a case of a transmission. | 
  | 4. Oil a working edge of a new sealing ring.  Transmission oil: SAE 75W–90 (API–GL–4).  |