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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.
INSTALLATION
(Refer to Figure 1)
B-LOC®
Series B109 Keyless Bushings are supplied lightly oiled and ready for
installation. They are self-centering and fit straight-thru hub bores. Note that the
extended flange on Series B109 units 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 screw, 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 four (4) turns and transfer at least
three (3) screws into push-off threads in order to keep Parts 1 and 2 separated
during assembly (see Figure 2).
3. After inserting Keyless Bushing into hub bore, relocate locking screw(s) used
for separating Parts 1 and 2.
4. Hand tighten locking screws and confirm that collar Item 1 is parallel and in
full contact with face of part to be attached to shaft.
5. 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.
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. Reset torque wrench to specified torque (Ma) and check all locking screws.
No screw should turn at this point, otherwise repeat Steps 6 and 7.
NOTE:
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 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 collars — necessary for release
of connection — is not restricted. Likewise, ensure that push-off threads
are in good condition.
2. Relax all locking screws by approx. four (4) complete turns and transfer
screws to all push-off threads located in flange of collar Item 1.
3. Release connection by evenly tightening all push-off screws (not
exceeding 1/4 turns) in a diametrically opposite sequence.
©2012 Fenner Drives B-PR-018 9/17/2012
INSTALLATION AND REMOVAL INSTRUCTIONS
FOR B-LOC
®
KEYLESS BUSHING SERIES B109
B109
Figure 1
Figure 2
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.
LOCKING SCREW SIZES AND SPECIFIED
TIGHTENING TORQUE M
a
B109 KEYLESS BUSHING
Metric Series
Inch Series
Tightening
Torque
Ma
(in lb)
Screw
Size
Hex
Key
Size
(mm)
6mm
1/4
38
M4
3
8mm to 19mm
5/16 to 3/4
42.5
M4
3
20mm to 35mm
7/8 to 1-3/8
87
M5
4
