b.
Cleaning and Repair
(1)
Degrease all parts and remove any foreign material from grooves etc.
(2)
Sealing surfaces on end rings (3 and 9) must be relapped to flatness, (and ground if any dents or cuts
appear in the sealing surface). Sealing surfaces should be micro-lapped to a tolerance of 6-10 light bands.
(3)
End rings should be THOROUGHLY cleaned and all abrasive removed prior to reassembly.
c.
Assembly.
(1)
Using a OO grade of non-detergent grease, apply a medium coating of grease to 4 o-rings (2 and 7)
carbon seal rings (4) and sealing surfaces of end rings (3 and 9).
(2)
Install two smaller o-rings (2) in end rings (3 and 9). Install two larger o-rings (7) in housing (8). Be certain
the o-rings are in their grooves.
(3)
With sealing surface of end ring (9) facing up, slide end ring slowly over end of shaft (10) against shoulder
on opposite end. DO NOT COCK END RING as this will cause o-ring (2) to be cut by retaining ring
grooves on the shaft.
(4)
Install one carbon seal ring (4) over shaft (spring holes must face up).
(5)
Install housing (8) over shaft and slide gently over carbon seal (4) until carbon seal bottoms out in housing.
The drive pin holes in housing and carbon seal MUST BE ALIGNED.
(6)
Install drive pin (5) and springs (6) making certain drive pin is free to move in carbon seal and is bottomed
out in carbon seal.
(7)
Install second carbon seal (4) with spring holes down. NOTE: drive pin hole in carbon seal must be aligned
with drive pin (5). Without compressing the springs (6), be certain each spring is in its respective counter
bored hole in carbon seal. Carbon seal should be resting on the springs and parallel with table surface. If
carbon seal appears cocked the springs are not positioned properly in spring holes.
NOTE
Again be certain the drive pin hole in upper carbon is aligned with drive pin in housing before
proceeding.
(8)
With sealing surface down, slide second end ring (3), over shaft and very gently contact upper carbon.
VERY GENTLY, slide the end ring down over the shaft compressing the springs (6) until the upper
retaining ring groove is fully exposed. DO NOT FORCE. This operation may take several tries as the
drive pin (5) must slide into the carbon seal (4). Excessive pressure will crack the carbon seal.
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