HF-7-600 Page 24
27. Position the air cylinder vertically with the drive end on the top.
28. Apply oil to the drive and idler rotor bearing bores in the bearing housing.
29. Place the air cylinder vertically in a hydraulic press with the drive end on top. The bottom of the idler rotor
shaft must be in contact with the bed of the press. The bottom of the drive rotor shaft must not be in contact
with the bed of the press. The blower air cylinder must be cradled on its sides but must not be restrained in
the vertical direction. Place a ball bearing (14) over the rotor shaft with the numbers on the bearing facing up.
Press the bearing onto the idler rotor shaft using the hydraulic press and the bearing driver tool.
FIGURE 7- 5 – INSTALL ROLLER BEARING
30. Repeat step 29 for the drive rotor bearing with the exception that this bearing is a roller bearing (35). One
side of the inner race of this bearing has a flange and one side does not have a flange. The bearing should
be installed so that the end of the inner race that does not have a flange is in contact with the ring carrier. In
this step the bottom of the drive rotor shaft must be in contact with the bed of the press and the bottom of idler
shaft must not be in contact with the bed of the press. The inner race and outer race(and rollers) must be
engaged with each other while the bearing is being pressed onto the rotor shaft. See Figure 7-5.
31. Position the air cylinder vertically on a work table with the drive end on the top. Support the cylinder so that
the rotor shafts are free to move in the vertical direction.
32. Measure the fixed end (gear end) axial clearance for both rotors. This can be accomplished by inserting
feeler gauges between the end of the rotor lobe and the inner surface of the bearing housing. This clearance
should be measured and recorded for all 3 lobes on both rotors. Compare these clearances to the
requirements on the clearance drawing (301HYC499). Do not proceed with the assembly if these
measurements are not equal to or greater than the minimum specified.
33. Position the air cylinder vertically with the gear end on the top. Support the cylinder so that the rotor shafts
are free to move in the vertical direction.
34. Repeat step 32 (with gear end on the top) to measure the floating end (drive end) axial clearance.
35. With the gear end on top measure and record the gear end axial clearance for all 3 lobes on both rotors.
Note there are no specifications on the clearance drawing for this measurement. This measurement will be
used to determine the axial movement of the bearings.
36. Position the air cylinder horizontal.
INNER RACE
FLANGE
OUTER RACE
AND ROLLERS
