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* Shock strut
* Drag strut
* Lock link
* Gas and oil charging valves
* Torsion links
* Integral axle
* Tow fitting
* Jack pad
* NLG doors.
Shock Strut
The nose gear shock strut supports the nose of the airplane.
The shock strut consists of an outer and inner cylinder. The
shock strut also has two centering cams, one in the outer
cylinder and one in the inner cylinder. The center cams hold the
nose wheels in a straight line position for gear extension or
retraction.
When the shock strut retracts or extends, it rotates around two
trunnion bearing and pins at the top of the outer drag strut. Each
pin extends through a trunnion bearing and support in the nose
wheel well aft lower side wall structure. Trunnion bolts keep the
trunnion pins from backing out during landing gear operation.
The right trunnion pin also has a hydraulic swivel assembly
connected. This permits the use of rigid hydraulic lines.
The left trunnion pin is hollow. Two nose wheel steering cables
go through the pin and the left nose wheel aft lower side wall
structure for nose wheel steering control.
Training Information Point
Obey this caution when you operate the nose gear steering:
NOSE LANDING GEAR AND DOORS - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 32-20-00
Page 2
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-20-00-001
CAUTION: THE NOSE GEAR SHOCK STRUT MUST BE
COMPRESSED AT LEAST 2.1 INCHES BEFORE
YOU OPERATE THE NOSE WHEEL STEERING. IF
THE SHOCK STRUT IS NOT COMPRESSED, THE
CENTERING CAMS CAN BE DAMAGED.
Drag Strut
A drag strut holds the nose gear in the extended or retracted
position.
The drag strut consists of an upper and lower link, hinged in the
center. The drag strut folds about the hinge during landing gear
operation. The lower end of the lower drag strut connects to the
shock strut outer cylinder. The upper end of the upper drag strut
connects to the nose wheel well forward upper side wall
structure.
When the landing gear operates, the drag strut rotates around
two trunnion pins at the top of the upper drag strut. Each pin
extends through a trunnion bearing and support in the nose
wheel well forward upper side wall structure. Trunnion bolts
keep the trunnion pins from backing out during landing gear
operation.
Lock Mechanism
A lock mechanism moves to an over-center position to lock the
drag strut in the up and the down positions. The lock
mechanism also stabilizes the drag strut in the fore and aft
direction. The lock mechanism consists of two lock links, two
springs, and a lock actuator.
Lock actuator
The lock actuator moves the lock mechanism to the locked
position when the nose landing gear is up or down.
Nose Landing Gear Actuator
The nose landing gear actuator supplies the force to retract and
extend the nose landing gear.
Gas and Oil Charging Valves
The shock strut uses hydraulic fluid and compressed dry air or
nitrogen to control the shock strut action. The gas charging
valve lets you pressurize the shock strut. The oil charging valve
permits hydraulic servicing of the shock strut.
Torsion Links
The torsion links prevent the inner shock strut from rotation in
the outer shock strut except when a steering force is applied.
The torsion links also permit movement up and down of the
inner shock strut in the outer shock strut.
NOSE LANDING GEAR AND DOORS - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 32-20-00
Page 3
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-20-00-001
The torsion links consist of an upper and lower link connected at
the aft ends. The forward end of the upper link connects to a
steering collar on the outer shock strut. The forward end of the
lower link connects to the inner shock strut. Steering forces
applied to the upper torsion link by the steering system are
transmitted to the inner cylinder by the lower link.
You can disconnect the torsion links to let the nose landing gear
move more than the normal steering limits of 78 degrees.
Integral Axle
The main landing gear axle attaches to the bottom of the inner
cylinder. You can not remove the axle if it gets 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.
Tow Fitting
A tow fitting is between the nose landing gear tires.
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