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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
12. Main Gearbox Bearings
_____________________
A. All bearings located within the main gearbox are roller bearings. In locations where accessory driveshafts are supported, the outer races are flanged. The inner race of the idler gear bearing is clamped. Flanged bearings have double-shouldered inner races and single-shouldered outer races. Bearing cooling and lubrication is accomplished by oil mist.
13. Angle Gearbox (Fig. 1)
_____________
A. The angle gearbox is located between the inner and outer diameter walls of the intermediate case at the 6 o'clock position.
B. The angle gearbox housing is a cast aluminum housing that contains a bevel gear set which transmits the power from the radial driveshaft to the horizontal driveshaft. Lubrication of the bearings and gears is accomplished by oil splash and by pressure oil supplied through three jets directed at the bearings and splines.
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MAIN GEARBOX - INSPECTION/CHECK
_______________________________
1. General
_______
A. This procedure gives a task to examine the main gearbox for signs of oil leakage, cracks or corrosion.
B. The main gearbox is installed at the bottom rear casing of the high pressure compressor (HPC).
C. You can open each half of the thrust reverser to get access to the main gearbox.
TASK 72-61-01-206-001-N00
2. Main Gearbox Inspection (Fig. 601)
_______________________
A. Standard Tools and Equipment
(1)
Container - 5 gallon (20 liter) capacity, applicable to collect oil
B.
Consumable Materials
(1)
D00390 Oil - Engine
(2)
B00448 Solvent - 1, 1, 1 Trichloroethane, Inhibited, MIL-T-81533
(3)
G00834 Cloth - Cotton, Lint-free
C.
References
(1)
AMM 12-13-03/301, Engine - Servicing
(2)
AMM 71-00-00/501, Power Plant
(3)
AMM 71-00-02/401, Power Plant
(4)
AMM 71-11-04/201, Fan Cowl Panels
(5)
AMM 71-11-06/201, Core Cowl Panels
(6)
AMM 73-21-10/401, EEC Oil Temperature Thermocouple Probe
(7)
AMM 78-31-00/201, Thrust Reverser System
(8)
AMM 79-21-10/401, Magnetic Chip Detector
(9)
IPC 72-61-00 Fig. 10
D.
Access
(1)
Location Zone
412 Engine 1 - Main Gearbox
422 Engine 2 - Main Gearbox
432 Engine 3 - Main Gearbox
442 Engine 4 - Main Gearbox
(2)
Access Panel 415 and 416 Thrust Reverser Halves - Engine 1 425 and 426 Thrust Reverser Halves - Engine 2 435 and 436 Thrust Reverser Halves - Engine 3 445 and 446 Thrust Reverser Halves - Engine 4
E.
Procedure
(1)
Open the fan cowl panels (AMM 71-11-04/201).
S 016-011-N00
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE A
2 THERMOCOUPLE PROBE FOR THE EEC OIL TEMPERATURE
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