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_______ THOROUGHLY PRE-MIX THE LUBRIZOL WITH 10 PARTS OF SHOCK STRUT FLUID BEFORE YOU ADD THE FLUID INTO THE STRUT.
 (1)  
You must add a lubricant to the shock strut during the servicing. As an alternative, you can use a fluid which has an added lubricant. For usual servicing when small quantities of fluid are necessary, you can use fluid without lubricant to fill the shock strut.

 S 613-050

 (2)  
All of the fluids that are listed here are compatible. Use any of these fluids to top off the strut even if the strut was originally filled with one of the other fluids.

 S 613-051

 (3)  
Lubrizol 1395 and methyl oleate are heavy duty lubricants. They are added to the fluid to reduce the wear on the parts of the shock strut that move.

 S 613-052

 (4)  
Use BMS 3-32, Type I to fill the shock strut for the first time when new, or after overhaul. There is a corrosion inhibitor in the MIL-H-6083 fluid.

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MAINTENANCE MANUAL

Servicing of the Shock Strut for the Main Landing Gear
Figure 301

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757
MAINTENANCE MANUAL

13.0 15.0 17.0 19.0 21.0 23.0 25.0 27.0 29.0 31.0
X DIMENSION (INCHES)
NOTE: WHEN YOU COMPLETELY DEFLATE THE SHOCK OIL AND NITROGEN SERVICING: STRUT, YOU MUST FOLLOW THE INSTRUCTIONS TO DO THE OIL AND NITROGEN SERVICING. 1. OPEN THE NITROGEN VALVE AND DEFLATE THE SHOCK STRUT COMPLETELY. NITROGEN SERVICING ONLY:
2.  FILL THE SHOCK STRUT WITH MIL-H-5606
1.  WITH THE AIRPLANE WEIGHT ON THE MAIN FLUID THRU THE OIL CHARGING VALVE. FILL
LANDING GEAR, MEASURE THE PRESSURE OF THE SHOCK STRUT UNTIL THE FLUID FLOWS
THE SHOCK STRUT WITH A PRESSURE GAGE. INTO THE DRAIN BUCKET AND IS FREE OF

BUBBLES. EACH TIME YOU COMPLETELY FILL
2.  ON THE SERVICING CURVE, FIND THE X THE SHOCK STRUT WITH OIL, ADD 32 FLUID
DIMENSION WHICH AGREES WITH THE OUNCES OF LUBRIZOL 1395.

CLOSE THE MEASURED PRESSURE.
OIL CHARGING VALVE.
3.  ADD OR RELEASE DRY NITROGEN UNTIL YOU
3.  WITH THE AIRPLANES WEIGHT ON THE MAIN
GET THE X DIMENSION IN THE CORRECT RANGE.
LANDING GEAR, INFLATE THE SHOCK STRUT

APPROXIMATELY 1 INCH. MEASURE THE PRESSURE PREFERRED;
OF THE SHOCK STRUT WITH A PRESSURE GAGE.
ON THE SERVICING CURVE, FIND THE X DIMENSIONUSE FULLY FORMULATED BMS 3-32 TYPE I (WITH WHICH AGREES WITH THE MEASURED PRESSURE. DOCORROSION INHIBITOR) OR TYPE II (WITHOUT THE SERVICING OF THE SHOCK STRUT WITHCORROSION INHIBITOR). BMS 3-32 TYPE I IS DRY NITROGEN.
USED TO FILL THE STRUT THE FIRST TIME AFTER
BEING OVERHAULED. REFILLS MAY BE DONE WITH
4. IMPORTANT: WHEN YOU DO THE INITIAL DRY NITROGEN BMS 3-32 TYPE II.
SERVICING OF THE SHOCK STRUT, INFLATE THE SHOCK
STRUT TO THE X DIMENSION PLUS 1.5 INCHES. CLOSE OPTIONAL;
THE NITROGEN CHARGING VALVE.
FOR BMS TYPE I - MIX MIL-H-6083 WITH 2.4%
5. AFTER THE AIRPLANE HAS MADE 5-10 LANDINGS, DO BY VOLUME OF LUBRIZOL 1395.
THE NITROGEN SERVICING FOR THE SHOCK STRUT
AGAIN. DO NOT DEFLATE THE STRUT.
FOR BMS TYPE II - MIX MIL-H-5606 WITH 2.4%
BY VOLUME OF LUBRIZOL 1395.
NOTE:  AVOID ADDING LUBRIZOL DIRECTLY INTO THE STRUT.
PRE-MIX THE LUBRIZOL WITH 10 PARTS OF STRUT
FLUID PRIOR TO FILLING SHOCK STRUT.

Servicing Chart for the Shock Strut of the Main Landing Gear
Figure 302

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757 MAINTENANCE MANUAL
 S 613-053
 (5)  
　
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