10. Remove the rotors from the blower housing.
11. Remove the rear end plate as in Step 9.
12. Remove and discard the lip-type oil seals from the end plates on current blowers. Remove the seal
washer, 0-ring, retainer and retainer spring from each rotor shaft on former blowers.
13. If required, disassemble the blower drive-spring support by driving the cam from the support with a
brass drift, permitting the springs and spring seats to fall free.
Clean and dry all of the parts thoroughly.
The finished inside face of each end plate must be smooth and flat. Slight scoring may be cleaned up with a
fine grit emery cloth. If the surface is badly scored, replace the end plate.
Inspect the surfaces of the rotors and the blower housing. Remove burrs or scratches with an oil stone.
Examine the rotor shaft, gear, or drive coupling for burred or worn serrations.
Inspect the blower gears for excessive wear or damage.
Check the bearing and oil seal contact surfaces of the rotor shafts and end plates for scoring, wear, or nicks.
If an oversize oil seal is required, the sleeve on the rotor shaft can be installed as follows:
Place sleeve remover J 23679-2 over the rotor shaft and behind the oil seal sleeve.
Back out the center screw of one gear puller J 21672-4 and attach the puller to the sleeve remover
with three 1/4-20 x 3-inch bolts and flat washers.
Turn the puller screw clock- wise and pull the sleeve off of the shaft.
Support the rotor, gear end up, on the bed of an arbor press.
Start a new sleeve straight on the shaft.
Place sleeve installer J 23679-1 on top of the sleeve and press the sleeve on the shaft until the
step in the installer contacts the shoulder on the shaft.
The step in the sleeve installer properly positions the sleeve on
To replace the former O-ring oil seals by the current lip-type oil seals,
rework the end plates by following the instructions given in Shop Notes.
Current front and rear blower end plates can now be identified either of two ways:
1. Knowing the machining differences, such as thrust washer drilling, governor hole drilling, counterbores
drilled, etc (Fig. 4).
2. End plates are stamped with the last digit of its part number (Fig. 5). The end plate with a part
number ending in 99 will have both numbers stamped in the plate.