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INSTALLATION
(Refer to Figures 1 and 2)
B-LOC
® Keyless Bushings are supplied lightly oiled and ready for installation.
When reinstalling a used unit, make sure that all slits are aligned and that front
and rear clamp collars are not reversed (when assembled correctly there are
no holes or threads behind taps in clamp collar Item 1, and no threads behind
taps in center collar Item 3). The frictional torque capacity of these devices is
based on a coefficient of friction of 0.12 for lightly oiled screw, taper, shaft and
bore contact areas.
Therefore, it is important
not to use Molybdenum
Disulfide (e.g., Molykote,
Never-Seeze or similar
lubricants) in any
Keyless Bushing installation.
1. Make sure that locking screw,
taper, shaft and bore contact
areas are clean and lightly
oiled and that all collar slits are
aligned.
2. Loosen all locking screws by a
minimum of four (4) turns and
transfer at least two (2) screws
to push-off threads in clamp
collar Item 1 to disengage this
part from center collar Item 3.
Similarly, transfer at least two (2) screws to push-off threads in center collar
Item 3 to disengage this part from clamp collar Item 2 (see Figure 2).
3. Completed assembly can now be placed on shaft and inserted into hub bore
by pushing against face of collar Item 1 and heads of locking screws threaded
into collar Item 2.This ensures collar Item 2 is not engaged at tapers during
this phase.
4. After placement of Keyless Bushing, relocate locking screws used for
separation of collars.
5. Hand tighten connection and confirm that clamp collar Item 1 is parallel with
face of part to be attached to shaft and/or with the front facing edge of center
collar Item 3.
6. Use torque wrench and set it approximately 5% higher than specified
tightening torque (Ma). Tighten locking screws in either a clockwise or
counterclockwise sequence (it is not necessary to tighten in a diametrically
opposite pattern), using only 1/4 (i.e., 90°) turns for several passes until 1/4
turns can no longer be achieved.
7. Continue to apply overtorque for 1 to 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 overtorquing,
an infinite number of passes would be needed to reach specified tightening
torque.
8. Reset torque wrench to specified torque (Ma) and check all locking screws.
No screw should turn at this point, otherwise repeat Steps 7 and 8.
NOTES:
1. It is not necessary to re-check tightening torque after equipment has
been in operation.
2. In installations subjected to extreme corrosion, the slits in clamp
collars Item 1 and Item 2, as well as in center collars, should be sealed
with a suitable caulking compound or equivalent. Likewise, push-off
threads should also be protected from corrosion.
B-LOC
® Keyless Bushings provide a high capacity, zero-backlash shaft/hub
or coupling connection by means of a mechanical interference fit. Please follow
these INSTALLATION AND REMOVAL INSTRUCTIONS carefully to ensure
proper performance of this
B-LOC
® unit.
WARNING
When installing or removing
B-LOC
®
products, always adhere to the following
safety standards:
1. Be sure that the system is de-energized using proper lockout/tagout
procedures.
2. Wear proper personal protective equipment.
INSTALLATION OF B-LOC® KEYLESS BUSHING
OVER SHAFT KEYWAYS
The Keyless Bushing should be positioned so that slits in Keyless Bushing
collars that contact the shaft are located approximately opposite the keyway.
In addition, a locking screw should be centered directly over the keyway.
When tightening locking screws, it is important to follow the installation
procedure outlined above, which specifies equal 1/4 turns of each locking
screw. Failure to follow these instructions could result in excessive
tightening of the screw over the keyway, possibly causing permanent
deformation of the Keyless Bushing collars.
REMOVAL
(Refer to Figure 2)
Prior to initiating the following removal procedure, check to
ensure that no torque or thrust loads are acting on the Keyless
Bushing, shaft or any mounted components.
IMPORTANT!
Make sure ends of locking screws used for removal
are ground flat and are slightly chamfered to prevent
damage to screw and collar threads during push-off.
1. Check to ensure that axial movement of clamp collars - necessary for
release of connection - is not restricted. Likewise, ensure that push-off
threads are in good condition.
2. Remove all locking
screws. Transfer
required number of
screws into all push-
off threads of clamp
collar Item 1 (see
Figure 2).
3. Release collar Item
1 by progressively
t i g h t e n i n g a l l
push-off screws.
Typically, the push-
off screws appear to
be completely tight
after just one pass
of tightening without
any noticeable separation of clamp collars. Although it seems that the
screws cannot be tightened further, several more rounds of torquing
in either a clockwise or counterclockwise sequence will increase the
push-off force in the system and ultimately release part of the front collar.
Afterwards, only the screws which are still tight should be tightened
further until complete dismounting is achieved. Remove clamp collar
Item 1.
4. Transfer locking screws used for dismounting of clamp collar Item 1
into all push-off threads in center collar Item 3 (see Figure 2). Release
clamp collar Item 2 by repeating procedures outlined in Step 3.
INSTALLATION AND REMOVAL INSTRUCTIONS
FOR B-LOC
®
KEYLESS BUSHING SERIES B112
B112
©2012 Fenner Drives B-PR-012 9/17/2012
LOCKING SCREW SIZES AND SPECIFIED
TIGHTENING TORQUE M
a
B112 KEYLESS BUSHING
Metric Series
Inch Series
Tightening
Torque
Ma
(ft lb)
Screw
Size
Hex
Key
Size
(mm)
25 x 55
to 35 x 60
1
to 1-7/16
12
M6
5
40 x 75
to 65 x 95
1-1/2
to 2-9/16
30
M8
6
70 x 110 to 90 x 130
2-5/8
to 3-5/8
60
M10
8
100 x 145 to 120 x 165
3-3/4
to 4-3/4
105
M12
10
130 x 180 to 160 x 210
4-15/16 to 6
166
M14
12
170 x 225 to 260 x 325
6-7/16
to 8
257
M16
14
280 x 355 to 340 x 425
500
M20
17
360 x 455 to 600 x 695
675
M22
17
