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Torsion Links
The torsion links prevent the inner shock strut from rotation in
the outer shock strut. This also permits movement up and down
of the inner shock strut in the outer shock strut.
The torsion links consist of two parts, an upper and lower link
connected in the center. The upper end of the upper link
connects to the outer shock strut. The lower end of connects to
the inner shock strut. A shimmy damper connects to the lower
link.
Shimmy Damper
The main gear shimmy damper decreases vibration between
the inner and outer cylinders during high speed taxi and heavy
brake use.
Axle Assembly
The main landing gear axle attaches to the bottom of the inner
cylinder. You can remove and replace the axle and brake
sleeve if they are damaged.
Jack Pad
A jack pad on the bottom of the shock strut lets you move the
inner cylinder up for wheel and tire replacement.
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MLG Doors
These are the three doors for each main landing gear:
* Outer door
* Center door
* Inner door.
The main landing gear doors cover the opening in the wing for
the shock strut when the main landing gear retracts.
MLG Wheel Well Seals (Not Shown)
There are no wheel well doors. The blade-type seals around the
openings in the bottom of the main landing gear wheel well (not
shown) make an aerodynamic seal around the outboard tire
when the main landing gear retracts.
The outboard surface of the outboard wheels operate as
aerodynamic covers for the main gear wheel when the main
landing gear retracts.
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The main landing gear shock struts are air-oil shock absorbers.
They have an inner cylinder that moves in an outer cylinder.
The seals provide an air-oil seal between the two cylinders.
Location
A static and a dynamic seal between the inner and outer
cylinders keep the mixture of nitrogen and hydraulic fluid in the
shock strut.
Physical Description
The seals are an elastomer type seal.
Functional Description
There are two spare static seals and two spare dynamic seals
in the shock strut. These let you remove and replace defective
seals without removal of the inner cylinder.
The upper bearing carrier (not shown) and the lower bearing
carrier hold the active and spare seals.
The excluder ring protects the spare seals from external
contamination and ozone damage.
The scraper ring protects the inner and outer strut components
from unwanted material.
The gland nut and retainer bolt hold the lower bearing carrier
in-place.
Training Information Point
Use plastic tools when you remove and install the shock strut
seals to prevent damage to the inner cylinder.
Measure the distance the gland nut extends below the outer
cylinder before and after you remove and install the gland nut. If
the distance is larger after installation than it was before, there
is an obstruction that prevents proper gland nut installation.
WARNING: DO NOT LOOSEN THE VALVE BODY UNLESS THE
SHOCK STRUT IS FULLY DEFLATED. AIR
PRESSURE CAN BLOW THE VALVE BODY OUT
AND CAN CAUSE INJURY TO PERSONS.
WARNING: THE CHARGING VALVE MUST STAY OPEN.
INTERNAL PRESSURE CAN BLOW OUT THE
GLAND NUT AND CAN CAUSE INJURY TO
PERSONS.
WARNING: WHEN AN AIRPLANE LOWERS RAPIDLY, IT CAN
CAUSE INJURY TO PERSONS AND DAMAGE TO
EQUIPMENT.
MAIN LANDING GEAR AND DOORS - SHOCK STRUT SEALS
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