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CAUTION:  ON SEALED BEARINGS, DO NOT APPLY GREASE WITH A PRESSURE GREATER THAN 1000 PSI (6.9 MPA) AND AT A RATE GREATER THAN 8.5 FL OZ (0.25 LITER) PER MINUTE. WHEN USING A HAND-OPERATED GREASE GUN, DO NOT USE EXTENSION HANDLE TO GAIN MORE FORCE. SEALED BEARINGS MAY BE DAMAGED BY EXCESSIVE PRESSURE.
H.  A Alemite Midget Flush adapter No 314150, or equivalent, is recommended for flush type grease fittings. Lincoln/St. Louis Medium Pressure Control Valve, which limits pressure to less than 2500 psi, is recommended with an Alemite Type 1728B lubrication fitting.
I.  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.
(1)  If fitting "blow out" occurs
(a)  
Check lubrication path of joint for obstruction or foreign material.

(b)  
Install new fitting. (Ref 20-10-151 R/I)

J.  General Purpose Lubricants
(1)  
The preferred general-purpose grease is BMS 3-33. MIL-G-23827 and BMS 3-24 are alternate general purpose grease.

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 brand name grease, flush out old grease to minimize intermixing.

(2)  
MIL-G-21164 and MIL-G-23827 are referred to as general-purpose airplane lubricants. MIL-G-21164 is equivalent to MIL-G-23827 but it has 5% molybdenum disulfide added. This makes MIL-G-21164 black or very dark. The MIL-G-21164 grease can cause stains, which are difficult to remove. Each operator can make the decision of which grease to use. The data that follows can help you make your decision:

(a)  
MIL-G-23827 is usually better for: 1) Instrument bearings 2) Areas where a stain is not permitted and the area must look satisfactory. 3) When the friction of braking components could be decreased from the

molybdenum disulfide. 4) If the relation of torque-to-tension of threaded fasteners could be changed from the molybdenum disulfide.

(b)  
MIL-G-21164 is usually better for: 1) For heavy loads, especially for steel surfaces sliding on steel surfaces. 2) Bearings where remaining lubrication is necessary to prevent or delay bearing

failure if most of the grease is gone.

(c)  
BMS 3-33 is better than MIL-G-23827 and MIL-G-21164 for general routine lubrication.

 

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1)  In some cases where MIL-G-23827 or MIL-G-21164 is specified, BMS 3-33 can be substituted.
2)  While BMS 3-33 is the preferred grease, because it demonstrates improved wear, corrosion protection and low temperature torque properties, it is acceptable to use MIL-G-23827 grease where BMS 3-33 is specified.  Although MIL-G-23827 and BMS 3-33 can be intermixed, repeated intermixing is not recommended.  When switching between greases, the new grease shall be applied until it is seen at the grease exit points.
500 
May 01/03  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  12-20-0 Page 203/204 

MAIN LANDING GEAR LUBRICATION - MAINTENANCE PRACTICES

A38136
5A3  Main Landing Gear Lubrication 
May 01/03  Figure 201 (Sheet 1)  12-21-11 
Page 201 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

MAIN LANDING GEAR LUBRICATION - MAINTENANCE PRACTICES

A37492
Main Landing Gear Lubrication  524 
12-21-11  Figure 201 (Sheet 2)  May 01/03 
Page 202 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

500  Main Landing Gear Lubrication (Trunnion Pin & Trunnion Link) 
Feb 20/94  Figure 201A  12-21-11 
Page 203 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Main Landing Gear Lubrication (Bolt - Downlock)  500 
12-21-11  Figure 201B  Feb 20/94 
Page 204 
　
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