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1. After everything has been installed for the upper shaft, remove rattles
from bearings (pressurizing).
(1) Assemble all parts for the upper shaft.
(2) Loosen two setscrews of the upper sprocket.
(3) Enter the tip of a tapered minus screwdriver into the coupling
slot until it stops. (Part A)
* If the screwdriver tip is not inserted fully in the slot, the flange
part of the upper sprocket is deformed or destroyed.
(4) Lightly turn the screwdriver to move the coupling toward B in
the direction of the arrow.
* The torque to turn the screwdriver is 7kgf•cm. (Light turning is
sufficient.) If it is turned too strong, the flange part of the upper
sprocket is deformed or destroyed.
(5) Tighten the setscrew of the upper sprocket.
(6) Turn the upper shaft by 90°C In regard to the second screw,
follow the same procedures as (3) to (5) above.
2. After everything has been installed for the upper and lower feed
shafts, remove rattles from bearings (pressurizing).
*Work is required when the upper/lower feed shaft is pulled out, or
when the setscrew of the upper/lower feed shaft front bearing
holder is loosened, or when the C ring of the upper/lower feed shaft,
right (pulley side), is removed.
(1) Install all the parts concerned with the upper and lower feed
shafts.
(2) Loosen two setscrews of the upper and lower feed shaft front
bearing holders.
* Temporarily remove the thread trimmer stopper if it disturbs
the flow of work.
(3) Enter the tip of a tapered minus screwdriver into the slot of the
upper/lower feed cam . (Part B)
(4) Lightly turn the screwdriver to move the upper/lower feed cam
toward D in the direction of the arrow.
* The torque to turn the screwdriver is 5kgf•cm. (Light turning is
sufficient.)
(5) Tighten the setscrew of the upper/lower feed shaft front
bearing holder.
(6) Turn the upper/lower feed shaft by 90°C. In regard to the second
screw, follow the same procedures as (3) to (5) above.
Adjustment Procedure Results of Improper Adjustment
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