HF-7-600 Page 28
60. Install an oil slinger (27) onto the drive end of the idler rotor shaft and (83) on drive rotor shaft.
61 Apply Loctite 262 to 2 bearing locknuts (36). Install the locknuts onto both of the drive end rotor shafts using
nut driver tool (EQ143816). Tighten the locknuts to 70 ft-lb.
62. Measure the runout of the teeth on both gears using a dial indicator and a magnetic base. Verify that the
runout is within the range specified on the clearance drawing.
63. Check that the oil seal bore in the drive end sump cover (29) is clean, dry, and free of nicks or burrs. Lay the
cover flat with the external surface facing up. Support the area under the seal bore with a block of wood.
Determine the proper orientation of the seal (31). The seal has two lips. The outer lip is shorter and when
installed should point toward the keyway end of the drive rotor shaft. The inner lip is longer and should point
toward the oil inside of the sump.
64. Drive the oil seal into the sump cover from the external surface using the seal driver tool (EQ143956) and a
press or small hammer. After installation the seal case should be flush with the external surface of the sump
cover. Apply oil to both of the seal lips.
65. Apply Loctite Gasket Eliminator 515 to the flange surface of the drive end sump cover.
66. Slide the seal protection sleeve (EQ143096-13) over the drive shaft. Apply oil to the outside surface of the
sleeve. Gently slide the drive end sump cover over the drive shaft.
67. Attach the cover to the bearing housing using 16 screws (5). Tighten the screws to 96 in-lbs.
68. Remove the protective sleeve from the drive shaft.
69. Apply Loctite Gasket Eliminator 515 to the flange surface of the gear end sump cover (3).
70. Attach the cover to the gear end of the air cylinder using 16 screws (5). Tighten the screws to 96 in-lbs.
71. Install plugs (47) in the 2 instrument holes in the air cylinder near the inlet and discharge port.
72. Determine the appropriate hole in each sump cover for the oil level gauge (40). The oil level will be in the
lower part of the oil sump. Apply Loctite 243 to the threads of each gauge. Install one oil level gauge in each
sump.
73. Install plugs (2) in the 3 remaining holes in each sump cover. Note there are no external sump breathers
used on this blower.
74. Measure the runout of the end of the drive shaft using a dial indicator and a magnetic base. Verify that the
runout is within the range specified on the clearance drawing.
75. Check the keyway on the end of the drive rotor for burrs. Install the drive shaft key (25) into the drive shaft.
Ensure that it is a snug fit. Tape the key to the shaft so that it does not get lost.
76. Attach a port connector (52) to the inlet and discharge ports. Install a gasket (51) between the connector and
the air cylinder. Use the required number of screws (46) and lockwashers (48). The screws (1/2
– 13 UNC)
for the HF406 blower should be torqued to 75 ft-lbs. The screws (3/8
– 16 UNC) for the HF408 blower should
be torqued to 30 ft-lbs.
