STEP 6: Clean all parts before proceeding with assembly.
STEP 7: Place smaller O-Ring (2-240) into groove “A” and larger
O-Ring (2-157) into groove “B” [Fig 5].
STEP 8: Slide Expansion Ring over Back Reamer shaft.
NOTE: Clocking of Ring is unimportant. It will bore with the same performance regardless
of alignment.
STEP 9: Slide Snap Ring over Back Reamer shaft until it rests above
groove “D” [Fig. 6]. It may be necessary to pry down Expansion Ring [Fig. 7]
with two screw drivers seated in Groove “C” [Fig 7a] while tapping the Snap Ring
until it snaps into place [Fig 8].
STEP 10: Install Locking Assy per the following instructions:
NOTE: Locking Assy is supplied ready to assemble. However, used units,
after thorough cleaning, should be lightly oiled, including bore, threads and screwhead
contact area.
ANOTHER NOTE: Do not use Molydebum-Disulfide, e.g., Molykote or
Never-Seeze.
STEP 10a: Slide Locking Assy over Back Reamer shaft. It will rest against
the bottom surface of the Expansion Ring.
STEP 10b: Hand tighten 3 or 4 equally spaced locking screws till initial
contact is established. A 10mm hex key or 3/8” square drive is required.
STEP 10c: Use torque wrench and set at approximately 95 ft-lb (this is 5%
over specified torque MA). Torque screws in either a clockwise or counter clockwise
sequence, using only ¼ turns for several passes until ¼ turns can no longer be achieved.
NOTE: It is not necessary to tighten in a diametrically opposite pattern.
STEP 10d: Apply over-torque for 1 or 2 more passes. This is required to
compensate for a system-related relaxation of locking screws since tightening of a given
screw will always relax adjacent screws. Without over torquing, an infinite number of
passes would be needed to reach specified tightening torque.
STEP 10e: Reset torque wrench to 91 ft-lb and check all locking screws.
No screw should turn at this point, otherwise repeat Step “10d”. It is NOT
necessary to recheck torque after equipment has been in operation.
LOCKING ASSY REMOVAL: Loosen locking screws in several stages using
approx ¼ turns, following a diametrically opposite sequence.
NOTE: Locking assemblies feature self releasing tapers. However, if for
some reason thrust rings jam, a light tap on 3 equally spaced heads of loosened screws
will release connection. If necessary, pull-out screw threads are located under the
cadmium plated (white colored) locking screws.
Expansion Ring Assy Complete.
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