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Maintenance and inspection procedures
5 Maintenance and Inspection
(10) RV-4FR/7FR series: Inspection and replacement of J3-axis timing belt
The reference figure at inspection and replacement of the timing belt is shown in Fig. 5-19.
Fig.5-19 ： Inspection and replacement of J3 axis timing belt (RV-4FR/7FR series)
■ Inspecting the J3 axis timing belt
1) Refer to Page 100, "5.3.2 Installing/removing the cover", and remove the No. 1 arm cover L.
2) Visually confirm that the symptoms indicated in Page 106, "(1) Timing belt replacement period" have not
occurred with the timing belt <2>.
3) Refer to Page 107, "(2) Timing belt tension measurement", and confirm the belt tension.
4) Install the No. 1 arm cover L securely as before and finish inspection.
■ Replacing the J3 axis timing belt (RV-4FR series)
If the timing belt of the J3 axis is removed, the forearm will drop by the self-weight.
And, if the positional relation between the timing pulley A <4> and B <5> deviated, it
will become the cause of the position deviation. For the safety before replacing the
timing belts, hit the J3 axis against mechanical stopper with releasing brake.
It is possible for the customer to replace the timing belt, but precise adjustment is
needed to prevent malfunction of the relevant parts. To ask for replacement of the
timing belt, contact the dealer.
1) Refer to Page 100, "5.3.2 Installing/removing the cover", and remove the No. 1 arm cover L and No.1 arm
cover U.
2) Remove the heat conduction sheet A stuck on the J3 axis motor (see Fig. 5-20). Be careful not to get any
dust, etc. on the adhesive side.
3) Make sure that the pulleys do not move while replacing the belt. If the timing pulley A <4> and B <5> position
relation deviates, the position could deviate.
Be careful not to shift the heat conduction sheet B (see Fig. 5-20).
4) Make marks on the timing belt <2> and timing pulleys <4> and <5> with a felt-tip pen as shown in Fig. 5-19 so
that the engagement of the timing belt <2> and timing pulleys <4> and <5> does not deviate.
5) Lightly loosen the two motor plate installation screws <1>. (Do not loosen too much.)
<3>Tension adjustment screw
With the fixing nut
<5> Timing pulley B
(joint side)
<4> Timing pulley A
(motor side)
Mark
<1> Motor plate installation screws
<2> Timing belt
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