(2)
B00116 Detergent - 1300A
(3)
G00843 Wipers - Clean, lint-free
C. References
(1) 21-58-01/401, Equipment Cooling Fans
D. Access
(1) Location Zone 121 Forward Cargo Compartment Forward Half, Left 122 Forward Cargo Compartment Forward Half, Right
E. Procedure
S 027-001
(1)
Remove the fan (Ref 21-58-01/401).
(2)
Remove the fan housing to get access to the impeller.
S 037-003
(3)
Remove the nut and the washer at the impeller.
S 037-002
(a) Discard the nut.
S 987-004
(4) Hold the impeller on opposite sides and move it from one side to the other to remove the impeller and the key from the rotor shaft.
NOTE: You can lightly hit the rotor shaft with a soft face
____ hammer while you pull the impeller to make it easy to remove.
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MAINTENANCE MANUAL
S 937-005
(5) Make marks on the impeller so you can install it the same way when
you removed it.
S 167-006
(6) Clean the impeller and the air passages:
CAUTION:_______ IF THE DETERGENT SOLUTION DOES NOT SOFTEN AND CLEAN THE
UNIT, YOU MUST DO AN OVERHAUL. IF WATER GOES INTO THE
MOTOR OR THE STATOR DRY IT FULLY WITH WARM AIR OR IN AN
OVEN.
(a) Soak the impeller in the water or the detergent solution until
the contamination loosens.
(b) Remove the contamination with a soft-bristle brush or a wood
spatula.
(c) Flush the impeller fully with clean water if you used the
detergent.
(d) Dry the impeller with lint-free wipers or dry compressed air.
S 437-008
(7) Install the key and the impeller on the motor shaft.
NOTE:____ Use the marks on the impeller to install it.
S 437-007
CAUTION:_______USE A NEW NUT TO INSTALL THE IMPELLER. IF YOU DO NOT USE A NEW NUT THE IMPELLER CAN BECOME LOOSE DURING OPERATION AND CAUSE DAMAGE TO EQUIPMENT.
(8)
Install the washer and the new self-locking nut.
S 437-009
(9)
Tighten the nut 80 to 100 pound-inches (11.3 newton-meters) above the run-on torque.
NOTE: The minimum back-off torque is 60 pound-inches (6.78
____ newton-meters).
S 437-010
(10) Install the fan housing.
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747-400 MAINTENANCE MANUAL
S 217-014
(11) Make sure that the impeller turns freely and does not touch the fan housing.
(a) Replace the fan if the impeller does not move freely or touches the fan housing.
NOTE: The fan motor bearings can be the cause of this problem.
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