Tightening The Screws - YASKAWA MOTOMAN MYS450L Operating And Maintenance Instructions Manual

Table 13: Greasing Popints
Greasing part
Reduction gear
θ1
units
θ2
Z Ball screw
spline unit
U Backlash-less
gear
* Under normal conditions, the reduction gear units shall be greased only when the motor is
replaced. However, in case of severe working conditions (such as high duty, high speeds,
large payloads, etc.), the reduction gear units must be greased every 10,000 hours.
9.4

Tightening the screws

Hexagon socket head cap bolts are used in places where mechanical strength is required. (A
hexagon socket head cap bolt will be called a "bolt" in this manual.) These bolts are fastened
with the tightening torques shown in the following table.
When it is necessary to refasten these bolts in some procedures in this manual (except
special cases as noted), use a torque wrench so that the bolts are fastened with the
appropriate tightening torques as shown below.
Table 14: Tightening torque
Screw
M3
M4
M5
M6
M8
M10
M12
Greasing Interval
In the replacement of motor*
First time: after 50 km operation
2nd or more: after 100 km operation
In Z greasing
Tightening torque
245 Ncm
490 Ncm
980 Ncm
1,760 Ncm
3,720 Ncm
7,350 Ncm
12,740 Ncm
E1101000117GB01
Grease Refer to:
SK-1A Maintenance:
10.1 Replacing the θ1 reduction gear
unit
10.2 Replacing the θ2 reduction gear
unit
AFB Maintenance: 10.10 Greasing the Ball
Screw Spline Unit
AFB Following indication
MYS450L
55