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INSTALLATION AND REMOVAL INSTRUCTIONS
FOR B-LOC
®
KEYLESS BUSHING SERIES B117
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.
INSTALLATION
(Refer to Figure 1)
B-LOC®
Series B117 Keyless Bushings are supplied lightly oiled and ready for
installation. They are self-centering and fit straight-thru hub bores. The extended
flange on Series B117 results in an axially fixed hub position during assembly.
When reinstalling a used unit, make sure that all slits are aligned. 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 screws, taper, shaft and bore contact areas are clean
and lightly oiled with a light machine oil and that all collar slits are aligned.
2. Loosen all locking screws by a minimum of two (2) turns and transfer at least
two (2) larger screws (item 4) into push-off threads in the collar (item 1) in
order to keep tapers of Parts 1, 2 and 3 disengaged during assembly (see
Figure 1).
3. After inserting Keyless Bushing into hub bore, relocate locking screws used
for separating Parts 1, 2 and 3.
4. Hand tighten all locking screws and confirm that flanged collar (item 1) is
parallel and in full contact with face of part to be attached to shaft.
5. Use a torque wrench and set to approximately 5% higher than specified
tightening torque M
a
for large screws (item 4). Tighten large locking screws
in 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.
6. 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.
7. Repeat steps 5 and 6 for smaller locking screws (item 5), but setting 5%
higher of specified tightening torque Ma for the smaller screws.
8. Reset torque wrench to specified torque (Ma) and check all large locking
screws and then reset torque wrench Ma and check all small locking screws.
No screw should turn at this point, otherwise repeat Steps 6, 7 and 8.
NOTES:
1. It is not necessary to re-check tightening torque after equipment has
been in operation.
2. The torque capacity of these units can be increased by approximately
25% by thoroughly cleaning the shaft and Keyless Bushing bore of any
lubricant. In applications subject to extreme corrosion, the slits in all
collars should be sealed with a suitable caulking compound or equivalent.
Likewise, push-off threads should 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 tightening
of the screw over the keyway, possibly causing permanent deformation of
the Keyless Bushing collars.
REMOVAL
(Refer to Figure 1)
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
face of collar during push-off.
1. Check to ensure that axial movement of collars — necessary for release
of connection — is not restricted. Likewise, ensure that push-off threads
are in good condition.
2. Remove all locking screws (items 4 & 5) and transfer shorter screws
(item 4) to all push-off threads located in flange of collar (item 1).
3. Release collar (item 2) by evenly tightening all push-off screws (not
exceeding 1/4 turns) in a diametrically opposite sequence.
4. Release collar (item 3) by re-tightening all push-off screws.
©2012 Fenner Drives B-PR-022 9/17/2012
LOCKING SCREW SIZES AND
SPECIFIED TIGHTENING TORQUE M
a
B117 KEYLESS BUSHING
Metric Series
(mm)
Locking Screws
Size 1
Size 2
Size
Install
Torque Ma
(Nm)
Size
Install
Torque Ma
(Nm)
180 x 250 to 260 x 330 M20
678
M16
348
280 x 365 to 600 x 685 M24
1180
M20
678
5
1
2
3
4
B117
Figure 1
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.
