5.5.1 Unloader
a) In the same way as for disassembly, lay main rotor
casing [1] on its side (horizontally).
b) Set unloader cover gasket [395], unloader piston [391]
and spring [392] to unloader cover [393].
You can install the unloader piston and spring first.
c) Insert this into the main rotor casing, and tighten the
unloader cover.
d) Screw an M8 bolt of the maximum allowed length
through the Rc1/4 hole of the unloader cover and
screw it to the unloader piston.
Check that the piston moves properly.
e) Remove the M8 bolt, and install Φ8 piping [538].
f) Raise (set vertical) the main rotor casing.
5.5.2 Rotor and Inner Race of Radial Bearing
Make the rotor sufficiently adjusted. By using fine emery paper, remove over any damage on the shaft
surface of the bearing and seal.
Both the M and F rotors have a certain engagement positions which are indicated by stamp marks.
Photo 018
M Rotor Mating Mark Photo 019 F Rotor Mating Marks
a) Shrink-fit the inner race of radial bearings [27-1] [27-2] to both the M and F rotors.
The inner race may move upward as it cools down and gets tightened. Hold it in position until it
cools down completely. Make the combination of the inner and outer races, which have been
packaged together, recognizable.
b) Screw the slotted set screw [31] fully into the M rotor.
c) Insert the M rotor into the main rotor casing. As it is heavy, be careful when handling.
As the i160* rotor weighs more than 30 kg, use lifting tools such as chain blocks and nylon belts.
After pushing about half of the rotor into the main rotor casing, remove the lifting tools and push in
the remaining portion of the rotor.
d) By following the same procedure as for the M rotor, push the F rotor into the main rotor casing. At
this moment, engage the M rotor tooth, which has stamped mark 1, between the F rotor teeth
having stamped marks 1 and 2.
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