>>> 'hld' problem from rnorman -- Wed Jan  3 14:49:17 1990 <<<

The hld is down for a yearly PM.  The DP will be cleaned and new oil
installed, the Ion Source Assly will be cleaned and the filliment replaced.
All the pneumatic valves will be inspected and repacked if necessary. The
hld probably will not be ready for use until early next week.  

>>> 'hld' problem from rnorman -- Thu Jan 11 07:12:50 1990 <<<

Problem: Down for yearly PM.

Solution: The system was totally torn down and cleaned.  The DP was
       cleaned and new oil installed.  The Ion Source Assly was cleaned
       and a new dual filement installed.  All three pneumatic valves
       were cleaned and re-greased.  And all the pneumatic lines were
       replaced.  The hld was turned on and a small air leak was found
       around the "oil bowl", which was tightened down.  The hld was
       tuned up and is now under vacuum ready for use.  It runs
       much better!

>>> 'hld' problem from parrish -- Thu Jan 18 11:58:12 1990 <<<

problem:   leaking pump

cause:     shaft seal failure

solution:  removed orignal pump and replaced with a spare

>>> 'hld' problem from rnorman -- Tue Jan 23 10:36:36 1990 <<<

There is still oil comming from a pump in the hld.  Everyday the
oil on the floor must be wiped up. It is brown oil.  Either the
new pump just put in is leaking oil or the other pump is leaking.

>>> 'hld' problem from bob -- Tue Jan 23 10:45:24 1990 <<<

A new forline pump has been installed in the hld. The hld is
up.

>>> 'hld' problem from rnorman -- Tue Jan 23 12:43:13 1990 <<<

One of the pumps in the hld is still leaking.  Everyday oil must
be wiped up from the floor.  There is oil under the rough pump and
hardly any under the newly installed foreline pump.

>>> 'hld' problem from rnorman -- Fri Jan 26 07:31:39 1990 <<<

Because of the leaking oil parrish suggested making a oil pan
for the pumps.  This sounds good to me, because every morning there
is oil under the hld.

>>> 'hld' problem from parrish -- Tue Jan 30 11:40:45 1990 <<<

system down for insulation of oil pan.

>>> 'hld' problem from parrish -- Tue Jan 30 13:44:04 1990 <<<

oil pan has been installed, and system is up.

>>> 'hld' problem from parrish -- Tue Jan 30 14:00:26 1990 <<<

problem:    oil leak to the floor

cause:      oil seepage at the roughing-pump

solution:   added a oil pan under both fore and roughing-pumps, this
            is common to mechanical-pumps, and all our pumps suppose
            to have oil pans under them. the hld is up.

>>> 'hld' problem from parrish -- Tue Feb 13 11:12:37 1990 <<<

problem:    system will not crossover to high vacuum

cause:      base pressure of roughing-pump at 60 microns

solution:   removed pump and replaced it with a rebuild one
            system is up.
