5-112
Maintenance and inspection procedures
(5) RV-2FR series: Inspection and replacement of J3-axis timing belt
The reference figure at inspection, and replacement of the timing belt is shown in
Fig.5-12 ： Inspection and replacement of J3 axis timing belt (RV-2FR 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
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.
2) 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.
3) Make marks on the timing belt <2> and timing pulleys <4> and <5> with a felt-tip pen as shown in
so
that the engagement of the timing belt <2> and timing pulleys <4> and <5> does not deviate.
4) Lightly loosen the two idler installation screws <1>. (Do not loosen too much.)
5) Loosen the nut fixing tension adjustment screw <3>. Loosen the tension adjustment screw <3>, and remove
the old belt.
6) Copy the marks onto the new timing belt. Make sure that both belts are tense when making the marks.
7) Align the new timing belt with the marks on the timing pulleys <4> and <5>, and install.
8) Turn tension adjustment screw <3>, and adjust the tension of timing belt <2>.
When the screw is turned to the right, the belt will be stretched, and when turned to the left, will loosen.
Adjust the belt tension slack to within the range as shown in
Page 135, "(15) Timing belt tension"
.
Before the tension measurement, rotate the timing pulley at least three times in each direction so that the
timing belt fits in the pulley. Check the tension measurement method in
Page 107, "(2) Timing belt tension
If the belt is loosened too much when adjusting the tension causing it to come off the timing pulleys <4> and
<5>, or if the belt and pulley teeth engagement is deviated, the machine system's origin will deviate.
9) After adjustment fastens the fixing nut of tension adjustment screw <3>, and certainly fixes tension
adjustment screw <3>. Moreover, also fasten two idler installation screws <1> certainly (M3 screw: tightening
torque is 1.96 Nm). Improper tightening can cause the belt to loosen with vibration.
10) Install the No. 1 arm cover L securely as before.
11) Refer to
Page 150, "5.6 Resetting the origin"
, and reset the origin position.
J3 axis
<1> Idler installation screw
<2> Timing belt
<5> Timing pulley B
(joint side)
<4> Timing pulley A
(motor side)
Mark
Mark
Idler
<3>Tension adjustment screw
With the fixing nut
CAUTION
