２ Robot arm
About Overhaul 2-38
2.8 About Overhaul
Robots which have been in operation for an extended period of time can suffer from wear and other forms of
deterioration. In regard to such robots, we define overhaul as an operation to replace parts running out of speci
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fied service life or other parts which have been damaged, so that the robots may be put back in shape for contin
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ued use. Overhaul interval for robots presumably varies with their operating conditions and thus with the degree of
the equipment's wear and loss of performance. As a rule of thumb, however, it is recommended that overhaul be
carried out before the total amount of servo-on time reaches the predetermined levels (24,000 hours for the robot
body and 36,000 hours for the controller). (See Fig. 2-16.) For specific information about parts to be replaced and
timing of overhaul, contact your local service representative.
Fig.2-16 ： Periodic inspection/overhaul periods
2.9 Maintenance parts
The consumable parts used in the robot arm are shown in Table 2-27. Purchase these parts from the designated
maker or dealer when required. Some Mitsubishi-designated parts differ from the maker's standard parts. Thus,
confirm the part name, robot arm and controller serial No. and purchase the parts from the dealer.
Table 2-27 ： Consumable part list
No.
Part name
Type
Note1)
Note1) Confirm the robot arm serial No., and contact the dealer or service branch of Mitsubishi Electric Co., for
the type.
Usage place Qty. Supplier
1 Grease SK-1A Reduction gears of each axis As needed
Mitsubishi Electric
2 Lithium battery A6BAT In the shoulder cover A
Type: All axis have brake
4
3 In the shoulder cover A
Type: J4 and J6 have no brake
5
Shipment
Failure rate λ
Predetermined time period
If overhaul is performed
Servo-on time
If overhaul is not performed
Periodic inspection
Over
-
haul
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