5
7. Torque Setting
1)
TGB20 --- TGB50 (TGB20-C --- TGB50-C)
①
.
Find the tightening angle that corresponds to your required trip torque using the Tightening Angle and Trip Torque graph on the
next page. First, tighten the adjustment nut 60 degrees below the determined value, and perform a trip test. Then gradually
increase the trip torque to its optimum value. Note that each graph should serve as a rough guide and not as a reference to
determine the actual trip torque.
②
.
Do not exceed the maximum torque on the indicator when tightening the adjustment screw. Otherwise, the dish springs will not
have sufficient space to flex.
③
.
After setting the optimum torque by turning the adjustment nut, tighten the lock screw provided to the following values. Note
that tightening less than the tightening torques given may cause the screw to loosen during operation. On the other hand,
tightening more than those shown may result in a deformed lock screw. Such screw may not be loosened.
Apply Loctite 242 or its equivalent to the lock screw to prevent loosening from vibrations.
Tightening Torque
Lock screw M5 : 3.8 N
・
m {38.7 kgf
・
cm}
Lock screw M8 : 16 N
・
m {163 kgf
・
cm}
Notes:
Ensure the following before retightening a lock screw that has been removed.
1.
The brass portion is not disengaged from the screw body (the rest of the screw). Using a lock screw whose brass portion and body are
disengaged may damage the hub thread.
2.
The brass portion is not markedly damaged. If the screw is used under such condition, the hub thread may be damaged.
Replace with a new lock screw if the above or similar conditions apply.
2)
TGB70 --- TGB130 (TGB70-C --- TGB130-C)
①
Adjust torque with adjustment bolts.
Loosen the three hexagon nuts used to prevent the adjustment bolts from loosening.
Make sure the adjustment nut matches the hub marking, and that the hexagon head cap screw used for anti-loosening (lock screw
for TGB70 and 70-C) is securely fastened.
②
.
Find the tightening angle that corresponds to your required trip torque using the Tightening Angle and Trip Torque graph on the
next page. First, tighten the adjustment nut 60 degrees below the determined value, and perform a trip test. Then gradually
increase the trip torque to its optimum value. Note that each graph should serve as a rough guide and not as a reference to
determine the actual trip torque.
③
.
Firmly tighten the hexagon nut to prevent loosening.
④
.
Do not exceed the maximum torque on the indicator when tightening the adjustment screw. Otherwise, the dish springs will not
have sufficient space to flex.
