T3-B T6-B Maintenance 12. Joint #4
102 T-B series Maintenance Manual Rev.1
Mount the screws and washers for bearing
shaft on the Joint #4 motor.
Tightening torque:
M3: 2 ± 0.1 N·m
M4: 2.5 ± 0.15 N·m
Washers for
beating shaft
T3-B: 2-M4x8
2- washer: (external diameter: ø12, internal diameter: ø4.2, thickness: 0.5 mm)
T6-B: 2-M3x6
2- washer: (external diameter: ø10, internal diameter: ø3.3, thickness: 0.5 mm)
Place the pulley around the U belt and secure temporarily the Joint #4 motor unit to
Arm #2.
Check that the motor unit can be moved by hand, and it will not tilt when pulled.
If the unit is secured too loose or too tight, the belt will not have the proper tension.
Make sure the gear grooves of the belt are fit into those of the pulleys completel
y.
Apply the proper tension to the U belt, and
secure the Joint #4 motor unit.
T3-B: 3-M4x20+M4 slotted hole washer
T6-B: 3-M4x20+M4 washer
Pass a suitable cord or string around the plate
hole of the Joint #4 motor unit. Then, pull the
cord
using a force gage or similar tool to
apply the specified tension shown below.
U belt tension:
T3-B: 34.5 N (3.5 ± 0.5 kgf)
T6-B: 29.0 N (3.0 ± 0.5 kgf)
Axial force (when pulling):
T3-B: 69.0 N (7 ± 0.5 kgf)
T6-B: 58.0 N (5.9 ± 0.5 kgf)
Apply the following torque to secure the plate.
Tightening torque: 4 ± 0.2 N·m
To check belt tension with the tension meter, refer to the following.
12.3 Checking the Timing Belt Tension (U Belt)
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