ABB IRB 920 Product Manual page 471

Refitting the ball screw with the flange
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Product manual - IRB 920
3HAC075721-001 Revision: C
5.6.4 Replacing the pulley on the ball screw lower position
Action
For robots with protection type Clean Room:
Clean the joints that have been opened and wipe
the parts free from particles with spirit on a lint
free. See Cut the paint or surface on the robot
before replacing parts on page 118
Note
After all repair work, wipe the Clean Room robot
free from particles with spirit on a lint free cloth.
Refit the ball screw assembly to the outer arm.
Tip
Make sure the marked location is aligned with the
ball screw shaft grooves.
CAUTION
With the inserting of the ball screw shaft, remove
the special tool along with the ball screw shaft
carefully.
Refit the screws and washers to the secure the
ball screw flange to the outer arm.
Tip
Pre-tighten the screws at 0.5Nm and slide the ball
screw up and down for five times. Then tighten
the screws at 3.8Nm to secure it.
© Copyright 2022 ABB. All rights reserved.
5 Repair
Continued
Note
IRB 920 special tool:3HAC077249-
001
xx2100001083
Screws: Hex socket head cap
screw M4x20 12.9 Lafre
2C2B/FC6.9 (4 pcs)
Washers: Spring washer 9x4.3x1
Steel (4 pcs)
Tightening torque: 3.5 Nm ±10%
xx2100001082
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