HF-7-602 Page 40
52. Install shrink disk/timing gear assembly onto rotor shaft and align teeth so timing gear and pinion gear mesh.
Firmly push against bearing inner race. Finger tighten the 12 locking bolts ensuring the gear can still be
rotated on shaft. Reference FIGURE 7-12.
Figure 7-12 – SHRINK DISK/TIMING GEAR INSTALLATION
53. Verify total interlobe clearance. Through discharge port, insert feeler gauges between rotor lobes.
Measurement is taken at pitch diameter of rotor lobes, just above widest cross sectional width of rotor lobe.
Clearance is measured along entire length of meshing lobes for all three interlobe meshes.
Total interlobe clearance: 0.017" min
54. Set closed side interlobe clearance. Closed clearance is measured between two meshing rotor lobes inside
air cylinder on trailing side of drive rotor lobe as it rotates in same direction of arrows cast in air cylinder.
Measurement is taken at the pitch diameter of rotor lobes, just above widest cross sectional width of the rotor
lobe. Clearance is measured along the entire length of meshing lobes for all three interlobe meshes.
54a. Lock idler rotor from turning by wedging a feeler gauge or shop rag between tip of a lobe and air
cylinder at inlet port. Through discharge port, insert a 0.007
” min feeler gauge between trailing side
of drive rotor and meshing idler rotor (locked).Using a weighted shaft crank, apply rotational force to
pull drive rotor tight against feeler gauge.
54b. While drive rotor is tight against feeler gauge, apply rotational force to timing gear in same direction
until teeth firmly mesh against teeth on pinion gear. Using a socket, tighten bolts of the gear locking
assembly in a diametrically opposite sequence only enough to secure timing gear to rotor shaft
when applying rotational force by hand.
Ensure gear is pressed firmly against bearing inner race.
Closed side interlobe clearance: 0.007" min
55. Verify open side interlobe clearance. Lock idler rotor from turning by wedging a feeler gauge or shop rag
between tip of a lobe and air cylinder at discharge port. Apply rotational force to drive rotor in same direction
of cast arrows on air cylinder. Measure clearance by inserting feeler gauge between leading side of drive rotor
and meshing idler rotor (locked) at pitch diameter of rotor lobes through inlet port.
Open side interlobe clearance: 0.010" min
56. Tighten shrink disk bolts to 30 in-lbs in a diametrically opposite sequence and verify interlobe clearances are
still within spec (See note below). Tighten shrink disk bolts to 106 in-lbs in a diametrically opposite sequence.
Repeat process to ensure screws will not turn when 106 in-lbs is applied to them a second time.
Note:
Do not turn any screw more than 1/4 turn during torque process!
Summary of Contents for HELIFLOW HYEL AA
Page 27: ...HF 7 602 Page 26 Figure 5 5 FALSE BEARING EQ144211 5...
Page 29: ...HF 7 602 Page 28 Figure 5 8 HAND CRANK EQ144211 8...
Page 30: ...HF 7 602 Page 29 Figure 5 9 MECHANICAL SEAL DRIVER EQ144211 9...
Page 31: ...HF 7 602 Page 30 Figure 5 10 FALSE BEARING SPACER EQ144211 10...
Page 44: ...HF 7 602 Page 43 SECTION 8 PARTS LIST HYEL_AA 300HYE810 D Ref Drawing...
Page 55: ...HF 7 602 Page 54 SECTION 10 PARTS LIST HYEL_AB 301HYE810 B Ref Drawing...
Page 58: ......
Page 59: ......