Mitsubishi Electric RH-12FRH Series, Instruction Manual

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Maintenance and inspection procedures
5Maintenance and Inspection
5.3.3 Packing Replacement Procedure
The packing gets deteriorated with the passage of time and must be replaced as required. Table 5-6 provides
guidelines for replacing the packing. Replace the packing in accordance with the instructions given below. If the
packing is not replaced in a timely manner, water or oil will be allowed to intrude the robot, possibly making it
inoperative.
Table 5-6 ： Packing replacement guideline
(1) Packing Replacement Instructions
Stick again new packing as before.
1) Remove the old packing, and clean and degrease the surface on which it has been placed.
2) The sticking surface of packing is double-coated adhesive tape. Referring to
"Fig.5-6 ： Example of sticking
packing (good example)" and "Fig.5-8 ： Sticking the cord-like packing" , and stick the packing in line with
form . Be careful for the packing not to slide. The example of unsuitable packing slid is shown in "Fig.5-
7 ： Example of sticking packing (bad example)" .
3) Extra length is included for each packing piece used on the cover where two or more pieces are attached to
one place. Stick packing in the following procedures. For more information, see "Fig.5-9 ： Examples of
packing overlaps". Examples of improperly treated cut edge are shown, as well.
a) Stick packing in line with form of the sticking surface. Finally, cut packing so that adjoining pieces have
a 1mm overlap at the end.
b) Apply liquid gasket to the cut edges. (Designated liquid gasket: 1212 (Maker: Three Bond))
c) Stick so that the gap may not be made to each other's packing.
Do not install the cover immediately after sticking packing. Install the cover,
after the 6 hours pass after sticking packing for gasket hardening.
4) Confirm that packing is stuck correctly and install the cover. When tightening the bolts fixing the cover,
avoid tightening them to a specified torque at a time. Tighten the bolt in the order shown as much as
possible in the
"Fig. 5-10 Example of order which tighten bolts" The torque which tightens the fixing bolt of
each cover is shown in "Table 5-4 ： Cover name and installation screw list (RH-3FRH/6FRH/12FRH/
20FRH series)" or "Table 5-5 ： Cover name and installation screw list (RH-3FRHR series)" .
Stick the packing securely, pressing down with the finger. If sticking is insuffi
-
cient, when the cover is installed, packing slides by the pressure, and there is a
possibility that it may become impossible to secure protection performance.
The packing replacement is completed.
Service environment
Whether or not
robot is pressurized
When packing must be replaced
General environment
Not pressurized
Note1)
Note1) When used in the "general" or "clean room" environment, robot can do away with pressurization.
When signs of cracking or peeling are noted in the packing.
Clean room
Not pressurized
Note1)
Waterproof environment Not pressurized
Oil mist Pressurized
Not pressurized When the cover mounted on the robot is removed/put back in place
CAUTION
CAUTION