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 TM 55-1905-217-34
(11) Remove the three bolts and seal washer assemblies securing the fresh water pump to the blower front end
plate cover, then remove the water pump and gasket. If necessary, tap the pump with a plastic hammer to loosen it.
(12) Remove the six bolts and seal washer assemblies securing the governor weight housing to the blower front
end plate cover, then remove the weight housing and gasket.
(1) Remove the ten bolts (8) and lockwashers (9) securing the end plate covers (7) and (18) to the blower front
(15) and rear end plates (31). Tap the ends of the end plate covers with a plastic hammer to loosen the covers from
the gaskets (10) and dowel pins in the end plates. Then, remove the covers and gaskets from the end plates.
(2) Place a clean folded shop towel between the rotors (29 and 30) and a towel between the rotor and the
housing (17) to prevent the rotors from turning. Then, remove the bolt securing the water pump drive coupling (6) to the
blower rotor shaft.
(3) Thread adapter J 6471-4 (1/2 inch-20 threads) or adapter J 6471-10 (9/16 inch-18) into the water pump drive
coupling, then attach slide hammer and shaft J 6471-1 to the adapter and pull the drive coupling from the blower rotor
shaft.
(4) Refer to figure 3-31 and remove the bolts (19), lockwashers (23) and plain washers (22) securing the blower
rotor drive hub (20) and drive hub plates (21) to the blower rotor timing gear, then remove the drive hub, plates and
spacers from the gear. If necessary, remove the three bolts(24), lockwashers and plain washers securing the drive
plates to the drive hub.
(5) Remove the blower rotor timing gears as follows:
(a) Remove the bolt (25), lockwasher (26) and gear retaining washer (27) securing the timing gear (28) to
the right-hand helix rotor shaft. Then, remove the bolt (25) lockwasher (26) and fuel pump drive coupling disc (35)
securing the timing gear (34) to the left-hand helix rotor shaft.
(b) Back out the center screw of both pullers J 6270-1 and secure the pullers to the gears with 5/16 inch-24
x 1 1/2 inch bolts.
NOTE
Both gears must be pulled from the rotor shafts at the same time.
(c) With the shop towels between the blower rotors and housing to prevent them from turning, turn the puller
screws uniformly clock- wise and pull the gears from the rotor shafts.
(6) Remove the bolts (12) and lockwashers (5) securing the rotor shaft bearing retainers (13) to both the front
and rear end plates. Remove the retainers.
(7) Remove the blower rear end plate and bearing assembly from the blower housing and rotors with the two
pullers J 6270-1 as follows:
(a) Remove the two fillister head screws (4) securing the rear end plate (31) to the blower housing, and
loosen the two fillister head screws securing the front end plate (15) to the housing approximately three turns.
(b) Back out the center screws of the pullers far enough to permit the flange of each puller to lay flat on the
face of the end plate.
(c) Secure the pullers to the end plate with six 1/4 inch-20 x 1 1/4 inch bolts.
NOTE
Be sure that the 1/4"-20 bolts are threaded all the way into the tapped holes in the end
plate to eliminate possible damage to the end plate.
(d) Turn the two puller screws uniformly clockwise and withdraw the end plate and bearings (32) from the
blower housing and rotors.
(8) Remove the blower front end plate in the same manner as described above.
(9) Withdraw the blower rotors from the housing.
(10) Remove the bearings (14 and 32) and the lip types oil seals (3) from the blower end plates as follows:
(a) Inspect the oil seals. If the seals are scored, or hard, new seals must be installed. If necessary, the
seals may be removed 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 installer J 6270-3 down through the oil seal and into the
bearing, with the opposite end of the remover under the ram of the press. Then, press the bearing and oil seal out of
the end plate.
(d) Remove the remaining bearings and oil seals from the end plates in the same manner.
3-41
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