2205Q2JE-HO-S6-N_2020.01.
Chapter 5 Maintenance and Inspection
SCV-series Screw Compressor 5.5 Reassembly
5-37
5.5.3 Installing the Rotors
The rotor must be sufficiently reworked. If any slight flaw is observed on the shaft surface in the area of
attaching the bearing or seal, use a sand paper to correct and finish the surface. After finishing the
surface to attach the seal, apply protective tape on the surface.
Both the M rotor and F rotor have a specific engagement position, and the position is marked by
carving.
In order to make it easier to match the positions when installing the rotor into the rotor casing, a number
is marked on the lobe tip: the M rotor has the marking on the discharge side, and the F rotor has the
marking on the suction side.
Mating Mark on the M Rotor
Mating Mark on the F Rotor
a) Apply sufficient amount of lubricating oil on the
main bearing in the bearing head and on the
bearing area of the rotor shaft.
b) Lift up the rotor’s midpoint using a crane or a
chain block with a belt sling, and insert the
rotor into the casing halfway along its length
while keeping it balanced on the belt sling.
Then detach the belt sling from the rotor and
push the rotor fully into the casing.
While it is easier to mate the markings if the F rotor is first installed into the casing, it is not a
to install the M rotor first.
Regardless of which rotor is installed first, the lobe of the M rotor with the carved marking of "1" must
be set in between the F rotor’s lobes that are marked "1" and "2". As it affects smooth engagement of
the teeth as well as the balance, be sure to mate the markings as describes here.
As the circumference of the rotor is touching the rotor casing in this condition, any
rotation of the rotor should be kept to the minimum required. Otherwise, the lobes tip
of the rotor may be worn.
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