Section 05 TRANSMISSION
Subsection 04 (DRIVEN PULLEY)
05-04-6
ADJUSTMENT
Refer to PULLEY DISTANCE AND ALIGNMENT
05-05 to adjust pulley distance. Adjust drive belt
height in driven pulley to obtain specified belt de-
flection. Turn Allen screws
no. 10
equally accord-
ingly.
5, Spring
General
It is usual to experience spring setting during
breaking period of a new spring. The factory
spring preload is slightly higher to compensate for
spring setting. Specifications in TECHNICAL
DATA 10-03 are applicable after break-in period
(about 10 hours of use).
Spring Torsional Pre-load
To check spring pre-load adjustment, use spring
scale hook (P/N 529 0065 00) and a spring scale.
Remove drive belt.
Install the hook on the sliding half. Preventing
fixed half from turning, pull sliding half with the
spring scale perpendicularly with pulley axle.
Take 1
st
measurement when sliding half begins to
turn. Rotate sliding half to 10 mm (3/8 in) of rota-
tion. Hold fish scale at this position. Slowly re-
lease tension from fish scale and take 2
nd
measurement when sliding half begins to return.
Spring pre-load is the average measurement be-
tween these 2.
TYPICAL
Step : 1
st
measurement
Step : 2
nd
measurement
To adjust spring pre-load, relocate spring end in
cam, moving it clockwise to increase the pre-load
and counterclockwise to decrease it. Refer to
TECHNICAL DATA 10-03.
NOTE:
If spring pre-load cannot be adjusted, try
to relocate the other end of spring in sliding pulley
(holes A, B, C).
Letters and numbers shown in illustration are actual letters and
numbers embossed on parts
NOTE:
Always recheck torsional pre-load after ad-
justing.
1
st
measurement
(when opening)
+
2
nd
measurement
(when closing)
=
Spring
pre-load
2
Example:
3.8 kg (8.4 lb)
(when opening)
+
3.4 kg (7.5 lb)
(when closing)
=
3.6 kg (8 lb)
Actual
spring
pre-load
2
529 0065 00
A01B18A
1
2
1
2
A18C0AA
32
1
4
5
6
A
C
B
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