Hi, if the seal went on bench testing I take it from that the axle was not under load so would not be deflected. The shaft could be bent I suppose. The design is fairly simple but I will ask a contact at Poclain who make the axle if he has any ideas. It does not sound as if the pressure is a problem.

The speed of the motor under testing can be critical, if the speed is above the maximum it can affect the motor badly. If only one side turns it can be run at overspeed.

Is there any way the seal could be damaged during assembly by the splines on the shaft?
Lastly, we have had instances in recent years of the seal being displaced from its bore during assembly, could this be possible? If so try loctite, I will try to come back again this week if I get some joy from my contact.

can you send your mail address so I can send a view of the motor to be sure we are talking about the correct seal.

My home mail is [email address removed]