| DATE |
MAINTENANCE |
| 09 Apr 2008 |
removed dewar from C15 at Cedar Flat |
| 14 Apr 2008 |
opened cold head - extremely dirty cleaned and replaced stage2 and stage3 seals; left stage 1 seal alone installed HIA-180 with WBA13 #184D (with James Lamb bias tee) |
| 22 Apr 2008 |
dewar installed on C13 |
| 01 Jun 2010 |
dewar removed from C13 stage3 seal worn through to spring on one side - replaced; stage2 seal worn very asymmetrically; thickness of plastic is 0.047 to 0.064" - replaced with another used seal in good condition replaced Scotch yoke bushings with OVRO bushings - no Kap-Seal bushings on valve clothespins are very stiff - replaced dowel pins on them |