12-21-00
ALL ú
ú 03 Page 1
ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(3) Lubrication equipment, such as grease guns, brushes and oil cans must be clean and free of everything but the lubricant involved during use.
NOTE: Some incompatibility may exist between MIL-G-23827 and
____ MIL-G-21164 greases that are thickened with clay and those thickened with lithium soap. Therefore, intermixing of brand name greases that employ different thickening systems should be avoided. Whenever changing a brand name grease, flush out old grease to minimize intermixing. It is acceptable to use BMS 3-33 where MIL-PRF-23827 grease is specified. However, repeated intermixing of the two is not recomended. When switching between greases, the new grease should be applied until it is observed to exude from the grease exits.
(4)
Lubrication blocks are used to locate the component or unit to be lubricated. Each block is divided into two sections, one section calls out the method of application, the other section calls out the type of lubricant.
(5)
Lubrication of sealed ball and roller bearings having lubrication provisions requires care to prevent seal blow-out during lubrication. A restrictor type adapter used on the grease gun will aid in preventing seal blow-out by limiting the rate of grease flow. A Alemite Midget flush adapter No. 314150, or equivalent, is recommended for flush type grease fittings. The flow of grease should be discontinued at the first evidence of seal deformation or grease seeping from the bearing.
(6)
Lubrication pressures from 100-200 psi should normally be sufficient for joint to accept grease. However, higher pressures may be required in some cases. Lubrication pressures in excess of 2500 psi may cause lubrication fitting to come loose (blow out) from joint.
(a) If fitting "blow out" occurs: 1) Check lubrication path of joint for obstruction or
foreign material. 2) Install new fitting (AMM 20-11-27/401).
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12-21-00
ALL ú ú 01 Page 2 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
LANDING GEAR - SERVICING
________________________
1. General_______
A. This procedure has three tasks:
(1)
The lubrication of the nose landing gear and doors.
(2)
The lubrication of the body landing gear, doors, and uplock mechanism. This task includes the application of corrosion inhibiting compound and a check for fillet seal damage on specified body landing gear bushings.
(3)
The lubrication of the wing landing gear, doors, and uplock mechanism. This task includes the application of corrosion inhibiting compound and a check for fillet seal damage on specified wing landing gear bushings.
B. This procedure shows all of the locations to lubricate for each landing gear and for each set of landing gear doors. This procedure also shows where you can lubricate the uplocks for each of the main landing gear.
C. This procedure shows all locations where a painted witness line can appear. Specified locations with a witness line will need the application of corrosion inhibiting compound. Specified locations without a witness line need a check for bushing fillet seal damage.
D. Grease fittings are ZERK fittings in this procedure. A grease gun is necessary to lubricate the ZERK fittings. To get to some ZERK fittings it will be necessary to use a flexible tube on the grease gun. On some ZERK fittings, a 90 degree fitting is necessary. You can use a ZERK grease gun to lubricate an ALEMITE grease fitting.
TASK 12-21-01-603-001
2. Lubricate the Nose Landing Gear and Doors (Fig. 301 through 305)_________________________________________
A. Standard Tools and Equipment
(1)
ZERK gun (grease gun)
(2)
Flush gun (grease gun)
(3)
Oil Spray Can
(4)
Oil Squirt Can
B. Consumable Materials
(1) D00633 Grease - BMS 3-33 (preferred)
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