Yamaha SIGMA-G5SII Service Information page 143

(4) Loosen the motor set bolt on the fixed side with the nut, adjust the motor position so
that the timing belt tension becomes 30 to 35N, and fix it.
* Tightening Torque : 86.2 to 96 cNm
SPAN
WEIGHT
WIDTH
Belt Tension
(5) Start up the machine and perform the zeroing operation for "NL → HL → NS → DD"
axes in this order.
At that time, make sure that the height of the pulley on the center shaft is the same as
that of the pulley on the motor side. Select "Maint.", "DVC Check", "Motor", "Select
Changed Block", "NL" and "Selection Axis" in this order, and press the [START]
button in the "Selection Axis" window.
The same procedure is applied to the HL-, NS- and DD-axis to zero.
(6) Fix the pulleys at the position where the nozzle No. 1 cam follower center agrees with
the roller rest center (center deviation: +/- 0.2 mm) while the NS-axis and DD-axis are
at their home positions.
At that time, arrange the pulley fixing block so that the hexagon hole of the fastening
bolt (M2L8) is turned outside (easy positioning for fastening).
* Tightening Torque : 56 to 68 cNm
Service Information
40MM
0.25gf/cm 2
6MM
30 to 35N
Fig.D47
SI1705004E-00=SIGMA-G5SII Service Manual
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For Service Engineer