Monday, February 27, 2012

Cessna 172R Shimmy Damper

NOSE LANDING GEAR SHIMMY DAMPER – SERVICING PROCEDURE
A. Service the shimmy damper every 100 hours.
B. Service the shimmy damper as follows:
(1) Remove the shimmy damper from the airplane.
(2) While you hold the damper in a vertical position with the fitting end pointed down, pull the fitting end of the damper shaft to its limit of travel.
(3) While you hold the damper in this position, fill the damper through the open end of the cylinder with hydraulic fluid.
(4) Push the shaft up slowly to seal off the filler hole.
(5) Clean the damper with solvent. Make sure that the shaft comes out through the filler hole until the damper is installed on the aircraft.
(6) Install the damper on the airplane.
C. Keep the shimmy damper clean.
(1) Clean the shimmy damper with a clean, lint-free cloth to prevent the collection of dust and grit.
(2) Make sure that the part of the damper piston shaft that you can see is always clean.
(3) Clean the machined surfaces of the shimmy damper.
(a) Use a clean, lint-free cloth soaked with hydraulic fluid to clean the machined surfaces.
(b) After the surfaces are clean, remove the remaining hydraulic fluid from them with a clean, lint-free cloth.
Shimmy Damper Servicing (On Airplanes with the Lord Shimmy Damper)
A. Lord Shimmy Dampers do not need special servicing. However, you must lubricate the nose wheel
shimmy damper pivots with general purpose oil MIL-L-7870.
B. Keep the shimmy damper clean.
(1) Clean the shimmy damper with a clean, lint-free cloth to prevent the collection of dust and grit.
(2) Make sure that the part of the damper piston shaft that you can see is always clean.
(3) Clean the machined surfaces of the shimmy damper with a clean, lint-free cloth to prevent the collection of dust and dust.
C. If necessary, exercise a shimmy damper before installation.
(1) If a shimmy damper has been in storage for a long period, make sure that it moves freely before you install
CAUTION: Make sure that you do not push or pull on the shaft of the shimmy damper after it has reached its limit in either the up or the down position. If you continue to push a fully
compressed, bottomed-out shaft, you can cause damage to the shimmy damper. If you
continue to pull on a fully extended shaft, you can cause damage to the shimmy damper.
(2) If the shimmy damper does not move freely, push and pull the shaft through complete cycles until it
does move freely. When the shimmy damper shaft has come to its limit of travel up and down as you push and pull, make sure that you do not continue to push or pull it beyond that limit of travel

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