CESSNA 172 SHIMMY DAMPER O-RING REPLACEMENT
Pull the forked end of the shaft through
the shimmy damper housing
until the hole is open on the opposite end.
Pour a small amount of 5606 hydraulic fluid in the hole (2 ounces.)
Push the shaft back through the housing until it stops.
Remove the snap ring on the end of
Now, hold the housing with the fork end down
and the shaft up.
Do this over a trash can, it's messy.
Hit the shaft with a plastic or brass hammer several times.
Keep the forked end of the shaft pushed
way into the housing when doing this
will damage the inner snap ring.
You are using the fluid inside to push
end cap (cap is under the snap) out of the housing.
This may take several hits, be careful
not to damage the shaft end.
Once the end cap is out, remove the inner
Slide the shaft and piston out of the housing.
Remove the o-ring in the end of the housing and replace with new o-ring.
Lay the shaft and piston on a
table and with a roll pin punch, remove
piston by removing the roll pin.
Slide the piston off the shaft.
Now slide the end cap off the
shaft and remove the o-ring in the end cap.
Install new o-ring in the end cap and a new o-ring on the outside of
the end cap.
Slide the end cap back on the shaft.
Slide the piston back on the shaft.
Install the roll pin.
Reinstall the shaft in the housing, reinstall inner snap ring.
Push end cap into the housing and install external snap ring.
Now pull fork end of shaft all the
of the housing and fill through the open
hole on the opposite end.
Be sure to exercise the shaft through the full
range of movement several
times to remove all air trapped inside.
Keep filling with fluid until
the housing is full and no air is felt
exercising the shaft through the range of travel.
Please check the scissor links for any movement.
If any movement is felt, shim the scissor links or the shimmy
damper will not last long.
Call 888-618-8133 to order Cessna 172 Shimmy
Damper Seal Kit
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