Dobot CR20A - Page 75

Dobot CR A Series User Guide
Issue V1.3 (2023-09-14) User Guide Copyright © Yuejiang Technology Co., Ltd.
67
Table 8.1 Check items
Period
Maintenance
item
Maintenance essential
Daily
3 months
6 months
√
Robot clean
Use a rag dipped in water, 10% ethanol,
etc. to wipe any dust, dirt, oil, etc.
visible on the robotic arm
√
Joint bolts
Check the torque of exposed bolts
based on the specified tightening torque
table
√
Tool mounting
bolts
Check the torque based on the specified
tightening torque table
√
Motor
Confirm abnormal heating or sound
√
Brake
Check whether the robot arm or end-
effector will fall when the servo is
powered off
√
Reducer
Check abnormal vibration, noise, and
oil leakage
√
Cables
Check that the connecting ends of
power cables, heavy-duty cables, IO
cables, etc. are secure and that the skin
is not worn out
The bolt tightening torque is shown in Table 8.2.
Table 8.2 Bolt tightening torque
Bolt size
Outer hexagonal bolt
(joint)
Inner hexagonal bolt
(12.9)
Hexagonal bolt
(rear cover)
3 mm / 0.118 in
2 Nm
2.4 Nm
0.7 Nm
4 mm / 0.157 in
4 Nm
4.5 Nm
-
5 mm / 0.197 in
7.5 Nm
9 Nm
-
6 mm / 0.236 in
15 Nm
18 Nm
-