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HF-7-604 Page 43
Drive
Rotor
Drive
Rotor
Inlet
Inlet
11. Preparation for Gear Installation
NOTICE
It is extremely important to maintain gap dimension (distance between gear back face and spacer)
in range 0.175”-0.200” or timing will be lost.
53. Carefully clean tapered ends of the shafts and tapering bores of the gears. Every gear and rotor will be stamped
with
L
or
R
to match each gear with its paired rotor. Match gear helix angle with rotor helix angle.
54.
Install spacer gear end (42) and lightly set gear (18) on idler rotor. Measure the distance between gear and
spacer. This distance should be in range from .175” to .200” If it is more, add shims equal to the di
ff
erence.
55.
Repeat step 53 for drive rotor.
56. Align rotors in timing position shown on images depending on which rotor is drive rotor. Insert .010” shims
between trailing side of the drive rotor lobe and Idler Rotor lobe. One 0.010” shim should be placed close to top
and second 0.010” shim close to bottom of rotors. The trailing side of the drive rotor lobe is determined by
looking through either the inlet or discharge port and rotating the rotor in the correct direction (as indicated by the
arrows cast into the air cylinder). The
fi
rst drive rotor lobe sur- face that meshes with an idler (short) rotor lobe is
the leading side. As the drive rotor continues to rotate the trailing side of this same lobe will mesh with a di
ff
erent
lobe on the idler rotor.
57.
Jam wedge tools (T10) between rotor lobes and cylinder to press rotors against shim and prevent rotor movement
during gear installation.
Summary of Contents for HELIFLOW 8 Series
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