Rotary oil seal failure
I'm dealing with a seal issue that is baffling me.
The tools are a electric drill with an armature pinion passing through a viton seal into an oil filled gear box.
The seals are failing almost immediately or very soon after replacement.
Note this is in a service workshop over dozens of drills. It has started occurring more and more often with no change in staff, oil or seal supply.
Seals are lubricated with silicone grease as per manufacturers requirements on assembly.
The failure is weird with chucks of the spring retainer torn off.
Are there any seal experts out there who can offer some suggestions as to the cause as the manufacturer is as baffled as we are
Edit: thanks for the replies so far. All of your replies are pretty much exactly the steps I've gone through. For some clarity: It doesn't happen every time. Its involving 3 tech's over the last year l, one tech has been here 10 years working on these.
My guy tells me the seal supplier has changed something, im trying to understand the mechanism of the failure.