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b) Place spacers between leaf springs,
and apply grease or rust preventative
oil between the spring and the spacer.
At that time, make sure not to include
dirt and chips between them.
c) Tighten the bolts to the tightening torques that
are specified as guide values in the table below.
Apply grease or rust-preventive oil to the
whole spring after adjustment of the springs.
When tightening the bolts, check that the
spacer orientation is aligned to that of leaf
springs.
Type/Size
Bolt used
Tightening torque
N25, N25·A
N32, N32·A
N40, N40·A
Hex. socket head bolt M12
(Strength division: 10.9 min.)
Approx. 117.6 N·m
(1200
kgf
x
cm)
N40·1
Hex. socket head bolt M14
(Strength division: 10.9 min.)
Approx. 186.2 N·m
(1900
kgf
x
cm)
(Note)
Guide value of tightening torque: In the case of
“
Approx. 117.6
N·m”
shown in the above
table, the value roughly means tightening of a bolt to the level such as tightening under
full power with one hand using a tool of 300 mm in arm length.
[3] Retightening
Check the leaf spring mounting 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 control knob 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.
Even if a leaf spring mounting bolt is tightened normally, the spring constant of the leaf spring itself
may reduce due to repetitive stress caused by vibration, thus resulting in slight decrease in the
amplitude, when the machine is operated for 40 to 100 hours.
[5] Replacement of leaf spring
100% replacement of leaf springs is recommended with the guideline of 1-year operation on the
basis of 8 hours a day.
If amplitude cannot be recovered after correction of set in fatigue described in [4] above, we
recommend that you replace all leaf springs, considering that the end of the life of the leaf spring has
been reached.
(Note)
When new leaf springs are required, place an order with us while referring to the part No.
of the leaf spring shown in Section 10
“
Specifications
”
.
Apply grease or
rust-preventive oil.
Spacer
Tighten.
