5 S t E P 3 Put down tool and swing tube out just far enough to allow it to be pulled down and out of its top seal as shown in Fig 3 R e m o v e a l l t u b e s i n t h e r o w r e p e a t i n g t h e a b o v e p r o c e d u r e If you are working with any of LM s ITS or stay systems with interlocking tabs the tube must be raised high enough so that the interlocking tab clears the adjacent groove as shown in Fig 4 C l e a n i n g t u b e E n d s Before the original tubes are reinstalled the tube ends must be clean of foreign material LM recommends polishing the tube ends with a polishing wheel Grainger 5A725 use Qty 5 together and a copper polishing compound Grainger 3W769 If the debris cannot be removed by polishing LM recommends using a piece of fine grit emery cloth or steel wool If there is a lot of debris on the tube ends use a 6 or 8 diameter wire wheel brush with a wire size of 006 or 008 Larger diameter wire sizes could damage the tube ends Try installing a tube If it does not slide easily into the top and bottom seals try polishing the tube ends as per above t u b e R e m o v a l continued S e a l I n s t a l l a t i o n h E L P F U L h I N t S LM recommends installing new MESABI seals when tubes are removed After removing the old seals clean the plate holes of any foreign debris with LM PN 99785 header plate hole cleaning brush placed in an electric or air drill Clean out inside of tanks and blow out plate holes with air Install new seals in clean dry holes Do not apply any lubricant to header plate holes If the core has a center tank do not install seals at the bottom of the top core until all the tubes are installed in the bottom core For ease of seal installation soak seals in hot water just prior to installing Make sure you use proper seal part number see Seal Lube Chart on page 3 With your thumb start the new MESABI seals into the holes and push them part way in Care must be taken not to install seals too far into the header plate A properly installed seal has a crowned or convex top surface and the tube hole is slightly flared at the opening A seal that is installed too far into the header has a concave top surface and the tube hole is noticeably smaller in diameter as shown in Fig 5 Overinstalled seals will make tube installation more difficult and are much more likely to be damaged during tube installation The use of a hammer directly on the seal can easily cause seals to be installed too far into the header plate LM recommends the use of a flat plate 38 x 3x 6 placed over the seals Hitting with a rubber mallet will allow the seals to be properly installed L u b r i c a t i n g S e a l s a n d t u b e E n d s For ease of tube installation and to minimize the chance of scuffing or tearing rubber seals during tube installation both top and bottom seals and both tube ends must be thoroughly lubricated using LM lube see Seal Lube Chart on page 3 for proper lube part number Using a 12 diameter brush LM PN 63451 and a minimal amount of lubricant apply a thin film into each seal hole and onto each tube end Fig 4 Fig 3 ON THE LEFT Properly installed seal RIGHT Seal installed too far into header Fig 5 d CORRECT d INCORRECT