ABB IRB 920 Product Manual page 690

5 Repair
5.6.11 Replacing the outer arm
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690
Action
Refit the screws and washers without fully
tightened.
Hang a strap to the motor.
Use a handheld dynamometer hooking to the strap
and pull the dynamometer to make the tension
falling in the allowed force range.
Note
During the measurement, make sure that all inter-
ferences that may affect the force are removed.
Pay attention to the force application direction.
Fasten the screws to the recommended tightening
torque.
Use a sonic tension meter to measure the timing
belt tension.
If the timing belt tension does not meet the require-
ment, loosen the motor screws and readjust.
© Copyright 2022 ABB. All rights reserved.
Note
Screws: Hex socket head cap
screw M4x20 12.9 Lafre
2C2B/FC6.9 (4 pcs)
Washers: Washer 4.3x10x2 steel
(4 pcs)
Tightening torque: 2.6 Nm ±10%
xx2100001178
xx2100001126
Used belt: 139
New belt:110
xx1800002887
Product manual - IRB 920
3HAC075721-001 Revision: C