(2)
Shock Strut Fluids - General
(a)
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.
(b)
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.
(c)
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.
(d)
Use BMS 3-32, Type I or Type II at the operator's discretion, for subsequent refills or to top off the strut. These two types of fluid are compatible.
(e)
If the proper mixture is not available, You can use MIL-H-6083 or MIL-H-5606 fluid without additives to top off the strut. Try not to do this, however, because the additive that is already in the strut will become more diluted. This will make it less effective.
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(3)
(4)
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737-300/400/500MAINTENANCE MANUAL
(f)
It is not necessary to change the seals in the shock strut if you drained the strut and filled with one of the other fluids.
(g)
Use the premixed fluid, BMS 3-32 Types I and II, if it is possible. This is more convenient for the operator and will remove the possiblility of error that can occur when the operator mixes the fluids.
(h)
Qualified vendors and vendor codes for the shock strut fluids
are listed in AMM 20-30-21/201.Preferred (Pre-mixed) Shock Strut Fluids
(a)
BMS 3-32, Type I -This is MIL-H-6083 fluid pre-mixed with 1.5 percent by volume of Lubrizol 1395 and 1 percent by volume of mehtyl oleate.
(b)
BMS 3-32, Type II -This is MIL-H-5606 fluid pre-mixed with 1.5 percent by volume of Lubrizol 1395 and 1 percent by volume of mehtyl oleate.
Optional (Not Pre-mixed) Shock Strut Fluids
CAUTION: YOU MUST MIX SHOCK STRUT FLUIDS THAT ARE NOT PRE-MIXED
_______ BEFORE YOU FILL THE STRUT. IF YOU POUR UNDILUTED LUBRIZOL DIRECTLY INTO A STRUT IT CAN SETTLE TO THE BOTTOM AND NOT MIX CORRECTLY. UNDILUTED LUBRIZOL CAN ALSO CAUSE THE STRUT SEALS TO SWELL AND SOFTEN.
CAUTION: YOU MUST MIX 1 PART LUBRIZOL 1395 WITH 10 PARTS MIL-H-6083
_______ OR MIL-H-5606 TO DILUTE THE LUBRIZOL BEFORE YOU ADD IT TO THE STRUT. IF YOU DO NOT DILUTE LUBRIZOL BEFORE YOU ADD IT TO THE STRUT IT CAN CAUSE DAMAGE TO THE STRUT AND SEALS.
(a) MIL-H-6083 fluid plus 2.4 percent by volume of Lubrizol 1395 -This mixture can be made from any approved source for MIL-H-6083 and mixed with 2.4 percent by volume of Lubrizol 1395.
NOTE: Operators can choose to add 1.5 percent by volume of
____ Lubrizol 1395 and 1 percent by volume of methyl oleate instead of 2.4 percent by volume of Lubrizol 1395.
(b) MIL-H-5606 fluid plus 2.4 percent by volume of Lubrizol 1395 -This mixture can be made from any approved source for MIL-H-5606 and mixed with 2.4 percent by volume of Lubrizol 1395.
NOTE: Operators can choose to add 1.5 percent by volume of
____ Lubrizol 1395 and 1 percent by volume of methyl oleate instead of 2.4 percent by volume of Lubrizol 1395.
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737-300/400/500MAINTENANCE MANUAL
B. Prepare to Check the Hydraulic Fluid Level in the Shock Strut
S 483-032
WARNING: MAKE SURE THE GROUND LOCK PINS ARE INSTALLED ON ALL THE LANDING
_______ GEAR. WITHOUT THE GROUND LOCK PINS, THE LANDING COULD RETRACT AND CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
(1) If the groundlock pins are not installed on all the landing gear, do this task: Install the ground lock assemblies (AMM 32-00-01/201).
S 613-038
WARNING: CLEAR THE AREA BELOW THE WING BEFORE YOU DEFLATE THE SHOCK
_______ STRUT. IF YOU DEFLATE ONE SHOCK STRUT, THE WING TIP CAN MOVE DOWN AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
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