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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
(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 separa-
tion 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 tight-
ening torque Ma. Tighten locking screws in either a clockwise or counter-
clockwise 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.
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 tighten-
ing of the screw over the keyway, possibly causing permanent deformation
of the locking assembly 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. R e m o v e a l l
locking screws.
Transfer re-
quired num-
ber of screws
into all push-
off threads of
clamp collar
Item 1 (see Fig-
ure 2).
3. Release collar
Item 1 by pro-
gressively tight-
ening all push-
o f f s c r e w s .
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 coun-
terclockwise 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.
©2012 Fenner Drives B-PR-013 9/17/2012
INSTALLATION AND REMOVAL INSTRUCTIONS
FOR B-LOC
®
KEYLESS BUSHING SERIES B115
B115
LOCKING SCREW SIZES AND SPECIFIED
TIGHTENING TORQUE M
a
B115 KEYLESS BUSHING
Metric Series
Inch Series
Tightening
Torque
Ma
(ft lb)
Screw
Size
Hex
Key
Size
(mm)
70 x 110 to 90 x 130
2-3/4
to 3-1/2
60
M10
8
100 x 145 to 160 x 210
3-15/16 to 6
105
M12
10
170 x 225 to 200 x 260
6-7/16
to 8
166
M14
12
220 x 285 to 260 x 325
257
M16
14
280 x 355 to 340 x 425
500
M20
17
360 x 455 to 600 x 695
675
M22
17
