Mitsubishi Electric RH-1FHR Series, Instruction Manual

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5-83
Maintenance and inspection procedures
5 Maintenance and Inspection
Inspection and adjustment procedure of the timing belt of J4 axis are shown below.
1) Confirm that the power supply of the controller is OFF.
2) Refer to
Page 72 "Fig. 5-3: Installing/removing the cover" , and remove the No.2 arm cover U and No.2
cover D.
3) Visually confirm that the symptoms indicated in "(1)Timing belt replacement period" have not occurred with
the timing belt.
4) Lightly press the center of the belt, and confirm that the value of belt slack is in Page 85 "Fig. 5-12: Belt
tension" .
Or measure the tension of the belt with tension meters, and confirm that the value is in standard tension
shown in
Page 85 "Fig. 5-12: Belt tension".
When adjustment is necessary, continue to follow the procedure shown below.
When adjustment is not necessary, install the No.2 arm cover U and No.2 arm cover D as before and finish the
inspection.
5) Adjusts the tension of the timing belt B <2>.
Lightly loosen timing pulley <B><C> fixing screws <3> (Be careful not to overly loosen the screws.).
6) Loosen the nut of tension adjustment screw <4> for timing belt B. Adjusts by turning the tension adjustment
screw <4> slowly and moving the timing pulley C <5> little by little.
When the screw is turned to the right, the belt will be stretched, and when turned to the left, will loosen.
Adjust tension to the above-mentioned value.
Note) Be careful, if the belt is removed from pulley <5> <6>, or the mesh of belt and pulley <5> <6> is
shifted by loosening the screw too much, the origin will deviate. If the position deviated, reset the
origin. (Refer to
Page 93, "5.6 Resetting the origin" )
7) After adjustment, fasten certainly the three timing pulley <B><C> fixing screws <3>. And fasten certainly the
nut of tension adjustment screw <4>. Improper tightening may cause the belt to loosen with vibration.
<The No.2 arm bottom view (Inside of the No.2 arm cover D)>
<5>Timing pulley C
<6>Timing pulley D
<4>Timing pulley B
<3>Timing pulley <B><C> fixing screws
(three screws)
Loosen
<2> Timing belt B
<3>Timing pulley <B><C> fixing screws
(three screws)
Loosen
<4> Tension adjustment screw for
timing belt B
Loosen the nut and screw
Push