24-21-21
ALL ú ú 01 Page 411 ú Mar 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
(2) S 014-025Remove these as one assembly, leave the wires attached to the ground bus bar angle:
NOTE:____ It is not necessary to remove the three wire connections from ground bus bar angle. Remove the three wires from the generator terminals. Remove the one nuetral wire from the ground bus bar angle, (the other end terminates at the generator output connector). Disconnect the connector from the current transformer. Make sure you tag the wires for positive identification before you remove them.
(a) (b) (c) Current transformer mountCurrents transformerGround bus bar angle
(3) S 014-026Remove the generator cooling air crossover duct.
(4) S 014-027Remove these terminal covers: (a) AC generator cover (b) Exciter terminal cover.
(5) S 034-028Remove all the terminal leads from the generator and the exciter studs.
NOTE:____ Make a mark on each terminal and put a tag on each wire to make sure you install them correctly.
(6) S 024-029Remove the APU generator. (a) Loosen the nuts on the generator mount installed around the generator flange (12 places).
NOTE:____ The mounting holes on the generator have slots to permit the removal of the generator with the nuts on the studs. Loosen the nuts 1/2 inch off the stud to permit the generator frame to turn. It can be necessary to lightly hit the generator with a rubber mallet to permit the generator frame to turn.
(b) (c) (d) Give support to the generator.Turn the generator frame counterclockwise (viewed from free end), until the studs align with the flange openings.Move the generator away from the APU turbine until the studs are clear of the generator flange.
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24-21-21
ALL ú ú 01 Page 412 ú Jul 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
TASK 24-21-21-404-095
5. APU Generator Installation (APU Removed) (Fig. 401)
________________________________________
A. Consumable Materials
(1)
Lubricant - Sundstrand P/N 730691 (Preferred)
(2)
Lubricant - Sundstrand P/N 718050 (Alternative)
(3)
Lubricant - Sundstrand P/N 688272 (Alternative)
(4)
Lubricant - 1 to 1 mixture (by weight) of molybdenum disulphide (per MIL-M-7866) and Rheotemp 500 grease (Alternative)
B.
References
(1)
AMM 24-21-41/401, Main Power Circuit Breakers
(2)
AMM 49-11-00/201, APU Power Plant
(3)
AMM 49-11-00/401, APU Power Plant
(4)
WDM 24-21-11, WDM 24-21-21, and WDM 24-21-31
C.
Access
(1)
Location Zone
303 APU Compartment
(2)
Access Panel
3804 APU Cowl Panel
D.
Procedure
S 424-030
(1) Install the APU generator.
(a) Loosen the nuts on the APU turbine studs.
NOTE: Keep a clearance of approximately 1/2 inch between the
____ APU turbine flange and the bottom of the nuts.
(b)
Lubricate the generator spline with approximately 1/2 cubic inches of lubricant.
(c)
Put the generator into its position on support until the generator flange holes and the studs on the APU turbine align.
(d)
Make sure that the terminal blocks are on the left side (when generator is viewed from the free end).
(e)
Make sure that the ground bus bar will be vertical.
CAUTION: BE CAREFUL WHEN YOU CONNECT THE MALE AND FEMALE SPLINES.
_______ THE GENERATOR CAN HIT THE TURBINE AND CAUSE DAMAGE TO THE AIRPLANE.
(f)
Connect the generator to the APU turbine splines.
(g)
Move the generator slotted holes to the turbine flange studs.
NOTE: Keep the holes and the studs aligned.
____
(h)
Turn the generator clockwise (viewed from the free end) until the stud shanks go into the slots in the generator mounting flange.
(i)
Make sure the torque of the nuts on the generator mounting stud is 160 to 190 pound-inches.
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