It furnishes the power to operate the blower and the fuel
(1) Description. The blower shutter assembly
pump.
is mounted between the water heater fuel pump bracket
and the blower housing. It is used to increase or to
b. Removal.
decrease the amount of air going to the burner.
(1) Remove the blower shutter assembly
(2) Inspection. Inspect the shutter assembly
SPE 35A, and SPE 41.
for broken segments and stops.
(2) Remove the fuel pump mounting bracket
(3) Removal.
with the shutter (para 4-41 e (1) (a) thru (c) ) on Army
models SPE 44, SPE 45, and York-Shipley model
(3) (a) thru (e)).
YS49279.
(b) Remove the three capscrews (4, fig.
442) and the lockwashers (5) that hold the fuel pump
hold the cover (5) to the control panel box (4), and
bracket (18) to the blower housing (7), and remove the
remove the cover from the box. Disconnect and tag the
bracket.
electrical connections leading to the motor.
(c) Lift the shutter assembly (17) off the
(4) Remove the conduit locknut, and slip the
blower housing.
motor conduit tube and wiring from inside of the control
panel box.
(4) Installation. Replace defective shutter
assembly with a serviceable one. Install it by reversing
(5) Remove
the
six
capscrews
and
the procedure in a (3) above, making certain the shutter
lever faces to the outside of the blower housing.
heater.
b. Shutter Assembly (Used on Army Models SPE
44, SPE 45 and York-Shipley Model YS49279).
and the motor (13) from the water heater.
(1) Description. Refer to a (1) above.
(7) Remove the housing gasket (6) from the
water heater.
(2) Inspection. Inspect the shutter for bent,
broken, and missing parts.
(8) Loosen the setscrew (3) in the coupling
(19), and slip the coupling from the motor shaft.
(3) Removal.
(9) Remove the four capscrews (11) and the
lockwashers (10) that hold the motor mounting plate (9)
and the washer (6) from the pin (3).
to the blower housing, and lift the motor off the housing.
The blower wheel will be attached to the motor shaft.
(b) Remove the pin (3), the spring (4),
and the flatwasher (5) from the shutter band (2).
(10) Loosen the setscrew (16) in the hub of the
blower wheel (8), and slide the blower wheel off the
(c) Remove the shutter band from the
motor shaft. Lift the key (14) from the motor shaft.
bracket (1).
(11) Remove the four capscrews (15) that hold
(4) Installation. Replace defective parts with
the motor to the motor mounting plate, and remove the
serviceable ones, and install them by reversing the
motor mounting plate.
procedure in b (3) above.
(12) Disconnect the wiring leads, and remove
the conduit tube and the wires from the motor.
a. Blower Housing and Gasket.
c. Inspection. Inspect for broken or cracked motor
and mounting plate, for damaged shaft threads, and for
(1) Removal. Remove the blower housing (7,
bent shaft.
fig. 4-42) and the housing gasket (6) from the water
d. Installation.
Replace defective motor and
mounting plate with serviceable ones, and install them
(2) Inspection. Inspect for cracked or broken
by reversing the procedure in b above. Connect the
blower housing.
(3) Installation. Replace defective housing
NOTE
with a serviceable one, and install it by reversing the
Be sure to check the rotation of
procedures in a (1) above, using a new gasket.
the motor. It should turn in the
direction in which the arrow
b. Blower Wheel.
points on top of the fuel pump.
(1) Description. The blower wheel, located in
Reverse the rotation of the motor
the blower housing, is driven by the blower and fuel
by interchanging any two of the
pump electric motor. It supplies forced air into the
external leads at the motor.
4-44. Blower Shutter Assembly
a. Shutter Assembly (Used on Army Models SPE
(2) Removal.
35, SPE 35A, and SPE 41).
(a) Remove the blower wheel and the
key from the motor shaft (para 4-43 b (1) thru (10)).
(b) Remove the setscrew (16, fig.
42) from the blower wheel.
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