TB Wood's Sure-Grip Instruction Manual

Installation & Maintenance Manual
Sure-Grip®
Idler Bushing
P-5071-TBW
Form 885D

2TB Wood’s • 888-829-6637 P-5071-TBW • Form 885D
SH-BB 1/4-20NC 5 ft. lb.
SD-BB 1/4-20NC 5 ft. lb.
SK-BB 5/16-18NC 8 ft. lb.
SF-BB 3/8-16NC 15 ft. lb.
E-BB 1/2-13NC 30 ft. lb.
Idler Cap Screw Torque
The Sure-Grip tapered, QD-style interchangeable idler bushing offers flexible and easy installation while
providing many hours of reliable service. To ensure that the bushing performs as specified it must be
properly installed. Before beginning, make sure the correct size and quantity of parts are available for the
installation.
WARNING:
Rotating equipment must be properly guarded.
It is the responsibility of the user to properly guard all rotating equipment to comply with OSHA
or any applicable regulations. Failure to properly guard may contribute to severe injury
should someone come in contact with the rotating parts or should the rotating part fail.
WARNING:
DO NOT use Wood’s products on any primary aircraft drive or any other drive which could
endanger human life should a drive component fail.
WARNING:
It is essential that the idler assembly be installed
as close to mounting structure as possible to minimize overhung loads.
Excessive loads may cause a premature failure of the stud and/or bearings of the idler bushing.
INSTALLATION
IMPORTANT – Do not use lubricants in this installation
1. Thoroughly inspect the bore of the mating hub and the tapered surface of the idler bushing. Any paint,
dirt, grease, oil, etc. MUST be removed.
2.Place the idler bushing in the mating hub. Align the drilled holes in the mating hub with the threaded
holes in the idler bushing flange. Insert the cap screws, with lock washers, through the drilled holes in
the mating hub into the tapped holes in the idler bushing flange and finger-tighten, see Figure 1. Using
a torque wrench, tighten all caps screws evenly and progressively in rotation to the torque value listed
in Table 1.
WARNING:
The tightening force on the screws is multiplied many times by the wedging action of the
bushing’s tapered surface. If extreme tightening force is applied, or if a lubricant is used, bursting
pressures will be created in the hub of the mating part.
Do not attempt to over tighten cap screws to a point where the bushing flange touches the face of
the mating part. These torque values must be adhered to or idler assembly will fail prematurely.
Table 1 – Cap Screw Tightening Torque
Figure 1
The Sure-Grip tapered, QD-style interchangeable idler bushing offers flexible and easy installation while
providing many hours of reliable service. To ensure that the bushing performs as specified it must be properly
installed. Before beginning, make sure the correct size and quantity of parts are available for the installation.
WARNING: Rotating equipment must be properly guarded. It is the responsibility of the user to
properly guard all rotating equipment to comply with OSHA or any applicable regulations. Failure to
properly guard may contribute to severe injury should someone come in contact with the rotating
parts or should the rotating part fail.
WARNING: DO NOT use TB Wood’s products on any primary aircraft drive or any other drive
which could endanger human life should a drive component fail.
WARNING: It is essential that the idler assembly be installed as close to mounting structure as
possible to minimize overhung loads. Excessive loads may cause a premature failure of the stud
and/or bearings of the idler bushing.
WARNING: Cancer - www.P65Warnings.ca.gov
INSTALLATION
IMPORTANT – Do not use lubricants in this installation
1. Thoroughly inspect the bore of the mating hub and the tapered surface of the idler bushing. Any paint, dirt,
grease, oil, etc. MUST be removed.
2. Place the idler bushing in the mating hub. Align the drilled holes in the mating hub with the threaded holes
in the idler bushing flange. Insert the cap screws, with lock washers, through the drilled holes in the mating
hub into the tapped holes in the idler bushing flange and finger-tighten, see Figure 1. Using a torque
wrench, tighten all caps screws evenly and progressively in rotation to the torque value listed in Table 1.
WARNING: The tightening force on the screws is multiplied many times by the wedging action
of the bushing’s tapered surface. If extreme tightening force is applied, or if a lubricant is used,
bursting pressures will be created in the hub of the mating part.
Do not attempt to over tighten cap screws to a point where the bushing ange touches the face of
the mating part. These torque values must be adhered to or idler assembly will fail prematurely.
Table 2 – Cap Screw Tightening Torque
Idler Cap Screw Torque
SH-BB 1/4-20NC 5 ft. lb.
SD-BB 1/4-20NC 5 ft. lb.
SK-BB 5/16-18NC 8 ft. lb.
SF-BB 3/8-16NC 15 ft. lb.
E-BB 1/2-13NC 30 ft. lb.

TB Wood’s • 888-829-6637 P-5071-TBW • Form 885D 3
To Remove:
1. Loosen and remove all of the cap screws from the idler assembly.
2. Insert the cap screws into the tapped holes in the mating hub. Evenly and progressively tighten the
cap screws until the idler bushing and mating hub separate.
3. Remove idler assembly from the mounting structure.
Replacement Parts:
Following is a list of the replacement bearings. SH-BB G275
SD-BB G275
SK-BB G276
SF-BB G276
E-BB G277
Bushing Replacement
Size Bearings
(2 per unit)
3.Mount the assembly to the mounting structure. Place lockwasher and then outer nut on idler bushing
stud, Figure 2. Using a torque wrench, tighten the outer nut to the value listed in Table 2.
Note: If the assembly will be threaded into a tapped hole in the mounting surface, extreme care
should be used to prevent the inner nut from turning against the bearings. Additional tightening force
on inner nut will cause bearings to fail prematurely.
WARNING
The inner nut has been tightened to 5 ft. lbs. DO NOT tamper with or retighten
above this value or the bearings will fail prematurely.
4. Make sure idler assembly is parallel with both the driveR and driveN shaft. Properly align the driveR,
driveN, and idler assembly by the four-point method illustrated in Figure 3, below.
SH-BB 1/2-13NC 60 ft. lb.
SD-BB 1/2-13NC 60 ft. lb.
SD-BB58 5/8-11NC 125 ft. lb.
SK-BB 3/4-10NC 225 ft. lb.
SF-BB 3/4-10NC 225 ft. lb.
SF-BB1 1-8NC 300 ft. lb.
E-BB 1 3/8-8NC 750 ft. lb.
Idler Cap Screw Torque
Table 2 – Outer Nut Tightening Torque
Note: The inner nut torque should not
exceed 5 ft. lbs. when reassembling.
Note: Straight edge must touch
two points on A and two points
on B and C.
Figure 3
Figure 2
3. Mount the assembly to the mounting structure. Place lockwasher and then outer nut on idler bushing stud,
Figure 2. Using a torque wrench, tighten the outer nut to the value listed in Table 2.
Note: If the assembly will be threaded into a tapped hole in the mounting surface, extreme care should be
used to prevent the inner nut from turning against the bearings. Additional tightening force on inner nut will
cause bearings to fail prematurely.
WARNING: The inner nut has been tightened to 5 ft. lbs. DO NOT tamper with or retighten
above this value or the bearings will fail prematurely.
4. Make sure idler assembly is parallel with both the driveR and driveN shaft. Properly align the driveR,
driveN, and idler assembly by the four-point method illustrated in Figure 3, below.
To Remove:
1. Loosen and remove all of the cap screws from the idler assembly.
2. Insert the cap screws into the tapped holes in the mating hub. Evenly and progressively tighten the cap
screws until the idler bushing and mating hub separate.
3. Remove idler assembly from the mounting structure.
Replacement Parts:
Following is a list of the replacement bearings.
Note: The inner nut torque should not exceed 5 ft. lbs. when reassembling.
To Remove:
1. Loosen and remove all of the cap screws from the idler assembly.
2. Insert the cap screws into the tapped holes in the mating hub. Evenly and progressively tighten the
cap screws until the idler bushing and mating hub separate.
3. Remove idler assembly from the mounting structure.
Replacement Parts:
Following is a list of the replacement bearings. SH-BB G275
SD-BB G275
SK-BB G276
SF-BB G276
E-BB G277
Bushing Replacement
Size Bearings
(2 per unit)
3.Mount the assembly to the mounting structure. Place lockwasher and then outer nut on idler bushing
stud, Figure 2. Using a torque wrench, tighten the outer nut to the value listed in Table 2.
Note: If the assembly will be threaded into a tapped hole in the mounting surface, extreme care
should be used to prevent the inner nut from turning against the bearings. Additional tightening force
on inner nut will cause bearings to fail prematurely.
WARNING
The inner nut has been tightened to 5 ft. lbs. DO NOT tamper with or retighten
above this value or the bearings will fail prematurely.
4. Make sure idler assembly is parallel with both the driveR and driveN shaft. Properly align the driveR,
driveN, and idler assembly by the four-point method illustrated in Figure 3, below.
SH-BB 1/2-13NC 60 ft. lb.
SD-BB 1/2-13NC 60 ft. lb.
SD-BB58 5/8-11NC 125 ft. lb.
SK-BB 3/4-10NC 225 ft. lb.
SF-BB 3/4-10NC 225 ft. lb.
SF-BB1 1-8NC 300 ft. lb.
E-BB 1 3/8-8NC 750 ft. lb.
Idler Cap Screw Torque
Table 2 – Outer Nut Tightening Torque
Note: The inner nut torque should not
exceed 5 ft. lbs. when reassembling.
Note:
Straight edge must touch
two points on A and two points
on B and C.
Figure 3
Figure 2
Note: Straight edge must
touch two points on A and two
points on B and C.
Figure 3
Figure 2
Table 2 – Outer Nut Tightening Torque
Idler Cap Screw Torque
SH-BB 1/2-13NC 60 ft. lb.
SD-BB 1/2-13NC 60 ft. lb.
SD-BB 58 5/8-11NC 125 ft. lb.
SK-BB 3/4-10NC 225 ft. lb.
SF-BB 3/4-10NC 225 ft. lb.
SF-BB1 1-8NC 300 ft. lb.
E-BB 1 3/8-8NC 750 ft. lb.
Bushing
Size
Replacement
Bearings
(2 per unit)
SH-BB G275
SD-BB G275
SK-BB G276
SF-BB G276
E-BB G277

P-5071-TBW Form 885D 2/19
www.tbwoods.com
2000 Clovis Barker Road
San Marcos, TX 78666
512-353-4000
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Neither the accuracy nor completeness of the information contained in this publication is guaranteed by the company and may be subject to change in its sole discretion. The operating
and performance characteristics of these products may vary depending on the application, installation, operating conditions and environmental factors. The company’s terms and
conditions of sale can be viewed at http://www.altramotion.com/terms-and-conditions/sales-terms-and-conditions. These terms and conditions apply to any person who may buy,
acquire or use a product referred to herein, including any person who buys from a licensed distributor of these branded products.
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