(13)
 If you drained the oil, Do this task:  "Test No. 3 - Ground Test -Idle power" (AMM 71-00-00/501).

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 MAIN GEARBOX - CLEANING/PAINTING
________________________________
 1.  General
_______
 A.  This procedure provides methods for cleaning shaft seal face(s) to remove carbon deposits when gearbox carbon seal(s) are replaced.
 TASK 72-61-01-107-005-N00
 2.  Main Gearbox Shaft Seal Face Cleaning
_____________________________________
 A.  Equipment
 (1)  
Lapping Tool for Hydraulic Pump Shaft - PWA 27357, Pratt & Whitney Aircraft, East Hartford, Connecticut

 (2)  
Lapping Tool for Fuel Pump Shaft - PWA 27357

 (3)  
Lapping Tool for Starter Shaft - PWA 27443

 (4)  
Lapping Tool for Deoiler Shaft - PWA 27444

 (5)  
Lapping Tool for VSCF Shaft - PWA 101858

 (6)  
Lapping Tool for IDGS Shaft - PWA 102096

 B.  
Consumable Materials

 (1)  
B00821 Gel - Alkaline

 (2)  
C00832 Compound - P05-006 Lapping

 (3)  
E00017 Scraper - Plastic

 (4)  
G00842 Cloth - Unsized Cheese cloth P05-038

 C.  
References

 (1)  
AMM 71-11-04/201, Fan Cowl Panels

 (2)  
AMM 71-11-06/201, Core Cowl Panels

 (3)  
AMM 78-31-00/201, Thrust Reverser

 D.  
Access

 (1)  
Location Zones
 410 Left Power Plant Nacelle
 420 Right Power Plant Nacelle

 E.  
Prepare for the main gearbox inspection.

 (1)  
Open the fan cowl panels (AMM 71-11-04/201).

 S 017-001-N00
 S 867-002-N00
 WARNING: DO THE DEACTIVATION PROCEDURE TO PREVENT THE OPERATION OF THE
_______ THRUST REVERSER. THE ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  
Do the thrust reverser deactivation procedure for ground maintenance (AMM 78-31-00/201).

 (3)  
Open the core cowl panels (AMM 71-11-06/201).

 S 017-003-N00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 S 017-004-N00
 WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO OPEN THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THESE INSTRUCTIONS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (4)  
Open the thrust reversers (AMM 78-31-00/201).

 F.  
Preferred Cleaning Procedure

 S 187-012-N00
 CAUTION: PREVENT LAPPING COMPOUND AND/OR ALKALINE GEL FROM FALLING INTO
_______ THE GEARBOX AND ENTERING THE OIL SYSTEM. OIL CONTAMINATION MAY OCCUR AND BEARINGS MAY BE DAMAGED.
 (1)  
Pack the area around the gearshaft with clean unsized cheese cloth (P05-038) to prevent any lapping compound to fall into the gearbox. Make sure that the gearbox seal is fully exposed.

 S 127-007-N00

 (2)  
Using the appropriate lapping tool, scrape off any carbon deposits from the gearshaft seal face at the point of interface with the carbon seal.

 NOTE: Remove the starter coupling prior to use of the lapping tool
____
 PWA 27443.

 (a)  Use the lapping tool with a standard 0.375 inch (9.525 mm) square drive "T" handle, or equivalent. 1) Use lapping compound (P05-006) to lap the gearshaft with
 the tool by hand with axial pressure applied to obtain the desired effect. 2) Clean and recharge the lapping tool with fresh lapping compound as necessary.
 3)  For heavy carbon buildups, prior to final lapping, it is necessary to resurface the tool by lapping it on the appropriate flat plate to restore the tool face wavyness to within 0.0003 inch (0.0076 mm) and surface finish of 10 microinches (0.25 micrometers).
　
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