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 NOTE: You can lightly hit the rotor shaft with a soft face hammer
____ while you pull on the impeller to make it easy to remove.
 S 937-004
 (4) Make marks on the impellers so you can install them the same way ú they were when you removed them.
 S 167-021
 (5)  Clean the impellers 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.
 ú (a) Soak the impellers in the detergent solution or solvent until
 ú the contamination loosens.
 ú 1) Use the solvent if the detergent solution does not
 ú completely clean the impellers.

 (b)  
Remove the contamination with a stiff-bristle brush or a wood spatula.

 (c)  
Flush the impellers fully with clean water if you used the detergent.

 (d)  
Dry the impellers with the lint-free wipers or dry compressed air.

 S 417-006
 (6)  Install the keys and the impellers on the motor shaft.
 NOTE: Use the marks on the impellers to install it.
____
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-58-47
 ALL  ú ú 04.1 Page 703 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 217-010
 (7)  Make sure the key is correctly engaged in each of the two impellers.
 S 437-007
 CAUTION:_______USE NEW NUTS TO INSTALL THE IMPELLER. IF YOU DO NOT USE NEW NUTS THE IMPELLER CAN BECOME LOOSE DURING OPERATION AND CAUSE DAMAGE TO EQUIPMENT.
 (8)  Install the washers and the new self locking nuts. S 437-008
 (9)  Tighten the nuts to 80-100 pound-inches above the run-on torque. NOTE: The minimum back-off torque is 60 pound-inches.____
 S 427-009
 (10) Install the blower (Ref 21-58-12/401).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-58-47
 ú  ALL  ú
 ú ú  ú 02.101 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 704Nov 15/92 

A
737-300/400/500MAINTENANCE MANUAL
 EQUIPMENT COOLING BLOWER CHECK VALVES - REMOVAL/INSTALLATION
____________________________________________________________
 1.  General_______
 A.  This procedure has two tasks. The first task gives instructions for the removal of the check valves for the equipment cooling blowers. The second task gives instructions for the installation of the check valves.
 B.  There are two check valves. One check valve is downstream of the main blower for the equipment cooling system. The second check valve is downstream of the alternate blower for the equipment cooling system. The check valves and the blowers are adjacent to each other.
 C.  The removal and the installation of each check valve is the same.
 TASK 21-58-51-004-001
 2.  Equipment Cooling Blower Check Valve Removal (Fig. 401)____________________________________________
 A.  References
 (1) 21-58-12/401, Equiment Cooling Blower
 B.  Access
 (1)  Location Zone
 205 Electronic Compartment

 C.  Procedure
 S 014-004
 (1)
Remove the equipment cooling blower (Ref 21-58-12/401).

 S 034-007

 (2)
Loosen the clamps.

 S 024-008

 (3)
Remove the check valve.

 TASK 21-58-51-404-002
 3.  Equipment Cooling Blower Check Valve Installation (Fig. 401)_________________________________________________
 A.  References
 (1) 21-58-12/401, Equipment Cooling Blower
 B.  Access
 (1)  Location Zone
 205 Electronic Compartment

 C.  Procedure
 S 424-003
 (1)
Put the check valve in its position in the flexible duct.

 (2)
Tighten the clamp nuts to 15 to 20 pound-inches.

 (3)
Install the equipment cooling blower (Ref 21-58-12/401).
　
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