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Repairs
5 Balancing unit
5.1 Dismounting balancing unit
Refer to foldout no. 2:13.
Dismounting:
1.
Move the lower arm to the sync. position.
2.
Insert an M12 screw at the top of the cylinder to neutralise the spring force. The
length of the cylinder is now locked.
3.
Attach a hoist and the lifting device (3HAC 6877-1) 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 (242).
4.
Remove the lock nuts <233> with tool (3HAC XXXX-X) and the support washer
<231> and the sealing ring <232>.
5.
Pull the balancing cylinder out with hand force.
Mounting (see Figure 6):
5.
Place rings (1), support washers (2), sealing rings (3) 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 5275-1, lower shaft: auxiliary shaft 3HAB 5276-1.)
7.
Hang up the new balancing unit on the upper auxiliary shaft, adjust the length with
the M12 screw while pushing the balancing cylinder in place by hand force, and
carefully install the balancing unit on to the upper and lower shafts (do not use a
hamer of any type, the bearings may be damaged).
8.
Fit the lubricating tool 3HAC 5222-1. The tool should be tightened to the bottom
position only by hand power.
9.
Grease through the nipple. Continue greasing until the grease exudes behind the
inner sealing ring. Repeat the 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.
Product Manual IRB 6400R
Balancing unit
25
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