NoteAction
Screws: Hex socket head cap
screw M4x20 12.9 Lafre
2C2B/FC6.9 (4 pcs)
Refit the screws of the transmission module
without fully tightened.
4
Washers: Plain washer machining
4.2x9x2 steel (4 pcs)
Tightening torque: 2.6 Nm ±10%
xx2100001087
Hang a strong strap to the motor.5
Used belt: 100Use 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.
6
New belt:240
xx2100001127
Tightening torque: 2.6 Nm ±10%
xx2100001087
Fasten the screws to the recommended tightening
torque.
7
Used belt: 202Use a sonic tension meter to measure the timing
belt tension.
8
New belt:180
If the timing belt tension does not meet the require-
ment, loosen the motor screws and readjust.
9
Continues on next page
Product manual - IRB 920 477
3HAC075721-001 Revision: C
© Copyright 2022 ABB. All rights reserved.
5 Repair
5.6.4 Replacing the pulley on the ball screw lower position
Continued
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