Tightening Order - Hitachi ZW 100-G Workshop Manual

IMPORTANT: The following items are applied to
both fine and coarse pitch threads.
•
Apply lubricant to the bolts and nuts in order
to reduce friction coefficient of them. (For
example, spindle oil with white zinc B
dissolved in it)
•
Torque tolerance is ±10 %.
•
Use the bolts of correct length. The bolts that
are too long cannot be tightened as the bolt
tip comes into contact with the bottom of bolt
hole. Also the bolts that are too short cannot
develop sufficient tightening force.
•
The torque given in the chart on the previous
page are for general use only, however, a
different torque is given for a specific
application. Use the specified torque.
•
Clean the nut and bolt threads and remove dirt
or corrosion before installing.

Tightening Order

When tightening two or more bolts, tighten them
alternately, as shown, to ensure even tightening.
a
1.4
2.3
a - Equally tighten upper and lower
alternately
GENERAL / Tightening
b
1
3
6
4 5
2
b - Tighten diagonally
W1-2-2
c
12 9 4 1 6
13 8 5 2 3 10
c - Tighten from center and diagonally
7 14
11
W105-01-01-003