- 11 -
[2] Caution in attaching and detaching leaf spring
When attaching and detaching the leaf spring, be sure to complete one unit before moving to the next
unit. Do not loosen all the units at the same time.
a) Set the fitting depth of bolts (dimension L includes the depth on upper vibrator side) 1.5 times of
the screw diameter, and change the bolt length when the leaf spring increases or decreases.
* Tighten the bolt securely, using the table below for guide of tightening torque.
Model/
Size
Used bolt
Tightening torque
MD10
MD20
Hexagon socket head bolt M6
(Strength classification 10.9 or above)
Approx 14.7 N
x
m
(150 kg f
x
cm)
MD30
Hexagon socket head bolt M10
(Strength classification 10.9 or above)
Approx 68.6 N
x
m
(700 kg f
x
cm)
Ｌ
b) Apply grease or rust preventive oil between leaf springs (between leaf spring and spacer) in
assembling.
MD10 MD20 MD30
(Note)
Do not sandwich dust, chip, etc. between the leaf springs.
[3] Retightening
Check the leaf spring tap bolt and retighten it after actual operating time of about 40 hours.
When the tightening is normal, there is hardly the additional tightening allowance. But, consider this
requirement as retightening of comfortable fitting of the leaf spring.
[4] Correction of fatigue
When the machine is operated with the speed adjusting volume set to the MAX. position at all times,
add 1 or 2 pieces of leaf springs to a leaf spring unit in either one place.
When the machine is operated 40 - 100 hours, the spring constant of leaf spring itself is deteriorated
by repeated stress by vibration, which slightly reduces the amplitude, although the leaf spring
mounting bolt is jointed normally.
Leaf spring
Spacer
Spring pressing plate
