Repairs Axis 2
Product Manual IRB 640 21
3.5 Dismounting balancing unit
Refer to foldout no. 1:1.
Dismounting:
1. Move the lower arm to the sync. position. Secure it by means of an M16x140
screw through the lower pivot shaft on the opposite side of the balancing unit.
2. Insert an M10 screw at the top of the cylinder to neutralize the spring force. The
length of the cylinder is now locked.
3. Attach a hoist to the balancing unit.
Make sure that the shaft between the upper and lower arms does not rotate when
unscrewing the KM nut. The KM nut is locked with Loctite 243.
4. Remove the KM nuts <5> with KM socket, size 4-KM 8.
Mounting:
5. Place rings <3>, support washers <4>, sealing rings <2> and the inner races of the
bearings on the upper and lower pivot shaft.
6. Install the auxiliary shafts on the upper and lower shafts. (Upper shaft: auxiliary
shaft 3HAB 6558-1, lower shaft: auxiliary shaft 3HAB 6567-1), see Figure 2.
7. Hang up the new balancing unit on the upper auxiliary shaft.
Adjust the length between the bearings by means of the M10 screw. This length
should preferable be 0.5 mm too short than 0.1 mm too long. If the distance is too
long the bearings may be damaged when erecting the balancing unit.
Carefully install the balancing unit on to the upper and lower shaft.
8. Fit the lubricating tool 3HAC 4701-1. The tool should be tightened to the bottom
position only by hand power.
9. Grease through the nipple. Continue greasing until the grease excudes behind the
inner sealing ring. Repeat procedure for the other bearings.
10. Remove the lubricating tool and clean the threads on the shaft ends free from
grease.
11. Remount the outer sealing rings, apply some grease on the support washers, apply
Loctite 243 on the KM nuts, not on the shafts, and tighten them to a torque of 50-
60 Nm.
12 Check play (min. 0,1) between support washers <2, 5> and bearing seat <7> at
both bearings.
13. Remove the M10x50 screw at the top of the cylinder. Remove the M16x140 screw
on the lower arm.
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