5-11
5.3.3 Lid O-Ring Replacement, SST #35164
• Remove the old O-ring using an O-ring pick or similar tool. Do not
allow hardened steel tools to gouge or scratch the dovetail groove.
• Unpack the replacement O-ring. Before starting the installation process it
is helpful to lay the O-ring on a table and mark it with a felt tip pen at two
evenly spaced points. Pull the O-ring into two parallel strands while
marking at each midpoint.
• Begin the installation by “tacking” the O-ring to the front and rear groove
at the midpoints of the groove and the O-ring. Pull the O-ring to either
side of the lid and locate the midpoint. “Tack” this point to the midpoint
of the side groove(s).
• The O-ring must be evenly distributed around the groove with no twist.
Continue “tacking” at several additional points before completing the
installation. Cycle the O-ring through several evacuations and then
adjust the lid latches, if necessary, per 5.3.4.
• Run a vacuum leak down and pressure check to verify integrity.
• Procedure complete.
5.3.4 Lid Latch Adjustment Procedure
• Remove the furnace enclosure. Referring to pictorial drawing “Chamber
Assembly,” locate item 19, attach bolts and loosen them so that the strike
assemblies, items 7 and 24, on both sides of the chamber can be moved.
With the lid in the open position observe that by rotating item 20
adjustment plate about item 9 dowel pin, the strike assemblies change
position, thereby controlling the gap between lid and chamber in the
closed position. Close the lid and push the handle down. Allow the
furnace to reach full vacuum before performing the following adjustment
procedures.
• With the furnace at full vacuum the lid handle should automatically slide
forward into the locking position. If it does not slide, turn items 8 and 20
adjustment plates on both sides of the chamber such that the handle slides
fully in and out of the locking position.
• Turn item 20 adjustment plate on the left side of the chamber until
resistance is felt, at this setting the clearance between the latch and strike
pin should be zero. Lightly tighten the attach bolts and test the
adjustment by pulling up on the lid handle and sliding it forward. Repeat
this procedure several times, fine tuning the adjustment until the
clearance in the latching mechanism is virtually zero and the handle can
To Next Page
Loading...