Today we re-lubricated the o-rings on the top air amplifier for T1/T2, and replaced the o-rings on the bottom air amplifier with new and also lubricated o-rings. 

We used Haskel lubricant #50866.

The bottom air amplifier spool assembly was noticably dirtier than the top (see attached). and we noticed some worn spots on the o-rings. This was not the case with the top air amplifier spool (it has not been used outside of testing since being fully serviced in 2012).

Replacing the o-rings did not result in any perceptible change to the cycle rate and sound of either air amplifier (~50 sec/cycle, same sounds made by the piston before and after servicing). 

We initially planned to also remove the sleeve on the amplifiers (see image) but could not do so easily. We will contact Haskel to get some input regarding how best to remove the sleeve.

The plan is to perform a full teardown of the lower air amplifier next shutdown (2024).