4. Maintenance and Inspection
69
16) Loosely tighten the M3 (for BA4/BA4U) or M4 (for BA6/BA6U, BA7/BA7U) hex socket flange head
cap screws holding the pulley unit for temporary to attach the pulley unit.
17) Adjust the belt tension.
Hang a wire on the pulley unit and pull it evenly by applying tension described in the table below
with a tension gauge.
After reached the specified load, tighten the hex socket flange head cap screw with a 2.5mm-
sized (for BA4/BA4U) or 3mm-sized (for BA6/BA6U, BA7/BA7U) hex wrench to hold the pulley
unit.
Tension
Type
When reusing existing belt
When replacing with new belt
BA4/BA4U
58N (5.92kgf)
58N (5.92kgf)
BA6/BA6U
88N (8.98kgf)
176N (17.96kgf)
BA7/BA7U
88N (8.98kgf)
176N (17.96kgf)
Hex socket flange
head cap screws
Pulley unit
Hex socket flange
head cap screw
Pulley unit
Wire
Pull the pulley unit evenly with a tension
gauge without tilted.