10. Remove the bearings and the lip type oil seals from
the blower end plates as follows:
a. When performing a major overhaul, discard the
oil seals, otherwise inspect the oil seals. If the
seals are scored, or hard, new seals must be
installed. If necessary, remove the seals from
the end plates at the same time the individual
bearings are removed.
b. Support the outer face of the end plate on wood
blocks on the bed of an arbor press.
c. Place the long end of the oil seal remover and
Fig 5 - Removing Blower End Plate using Tool
installer J 6270-3 down through the oil seal and
Set J 6270-F
into the bearing, with the opposite end of the
c. Align the hole in each puller flange with the
remover under the ram of the press (Fig. 6).
tapped holes in the end plate and secure the
Then, press the bearing and oil seal out of the
pullers to the end plate with six 1/4"-20 x 1-1/4"
end plate. Discard the oil seal.
d. Remove the remaining bearings and oil seals
from the end plates in the same manner.
CAUTION: Be sure that the 1/4"-20
bolts are threaded all the way into
Wash all of the blower parts in clean fuel oil and dry
the tapped holes in the end plate to
them with compressed air.
provide maximum anchorage for the
pullers and to eliminate possible
Examine the bearings for any indications of corrosion or
damage to the end plate.
pitting. Lubricate each bearing with light engine oil.
Then, while holding the bearing inner race from turning,
d. Turn the two pullers screws uniformly clockwise
revolve the outer race slowly by hand and check for
and withdraw the end plate and bearings from
rough spots. .
the blower housing and rotors as shown in Fig.
The double-row ball bearings are pre-loaded and have
no end play. A new double-row bearing will seem to
have considerable resistance to motion when revolved
8. Remove the blower front end plate in the same
manner as described in Step 7 above.
9. Withdraw the blower rotors from the housing.
NOTE: When a blower with lip type
oil seals is being reconditioned
oversize oil seals and oil seal
spacers are available in the blower
kit to replace the standard oil seals
where the blower rotor shafts are
Inspect the blower rotor lobes, especially the sealing
ribs, for burrs and scoring. Rotors must be smooth for
efficient operation of the blower. If the rotors are slightly
scored or burred, they may be cleaned up with emery
Examine the rotor shaft serrations for wear, burrs or
Fig. 6 Removing Oil Seal and Bearing from End
peening. Also, inspect the bearing and oil seal contact
Plate with Tool J 6270-3
surfaces of the shafts for wear and scoring.
Inspect the inside surface of the blower housing for
burrs and scoring. The inside surface must be smooth
for efficient operation of the blower. If the inside surface
of the housing is slightly scored or burred, it may be
cleaned up with emery cloth.