Cleaning, Inspection, And Repainting Shimmy Damper; Assembly Of Shimmy Damper - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
3. Remove rod end from piston rod assembly and then remove snap ring from piston rod end of
cylinder body.
CAUTION
Do not use sudden Jerking motions when removing piston rod
assembly and cap from cylinder body.
4. Grasp piston rod firmly with hand and remove piston rod assembly and cap bearing from
cylinder body using gradual pressure outward. After removing rod assembly from cylinder body, slide end
cap off of rod.5. Remove cylinder body from vise and dispose of remaining fluid left in the unit.
6. Remove snap ring securing end cap and remove end cap.
7-13b CLEANING, INSPECTION, AND REPAINTING SHIMMY DAMPER
a. Gar Kenyon and Parker Hannifin
1. After removing O-rings and backup rings from piston rod assembly, and endcaps, degrease all
parts and dry thoroughly
2. Visually inspect cylinder body bore for nicks, scratches, or signs of excessive wear. Excessive
scratches In bore or deep scratches necessitates replacement. Any small nicks, scratches, or paint chips on
exterior of cylinder body can be blended using fine (#100 fine grit) sandpaper.
3. Thoroughly clean repaired surface of cylinder body exterior. Paint exposed areas with one
coat of primer, and one coat of white polyurethane enamel.
4. Visually inspect piston rod assembly for excessive nicks, scratches, or deformation. Excessive
wear to rod assembly necessitates replacement. Any light surface scratches may be removed using fine grit
sandpaper. Place piston rod assembly on flat surface and roll. Any piston rods deformed from excessive load-
ing should be replaced.
5. Inspect end cap for signs of excessive side loading. Result of extreme side loading to end cap
wi11 be elongation or deformation of 0.375 diameter through hole. In this event, replace end cap.
6. Inspect Clamp assembly for distortion from excessive loading conditions. Check welds on
clamp assembly for development of any cracks.
7. Check nut on clamp assembly to en sure locking feature is not damaged or destroyed. Replace
if locking feature is damaged or destroyed.
7-13c. ASSEMBLY OF SHIMMY DAMPER
a. Gar Kenyon and Parker Hannifin
1. Prior to placing O-ring on piston rod assembly, coat with Dow Corning Molykote 55M. After
coating, install O-ring on piston between the two single turn backup rings. A thin coating of Dow Corning
Molykote can also be applied to the piston rod.
2. Coat O-rings with Dow Corning Molykote 55M and install on end cap bearing. O-ring will
require a backup ring on the outboard side.
3. Slide end cap bearing over piston rod. Coat cylinder bore liberally with MIL-H-5606
hydraulic fluid.
4. Insert piston rod assembly into cylinder body being careful not to cut O-rings or backup rings
when installing. Secure end cap with snap ring.
5. Extend piston rod assembly to the fully extended position. Place unit, rod side down, in a
bench vise, or suitable holder, to aid in filling.
6. With unit secured, and rod assembly in extended position, pour 36 ml. or 1.1 to 1.2 oz. of
MIL-H-5606 hydraulic fluid into cylinder body.
7. After filling, coat O-ring with Dow Corning Molykote 55M and install on end cap. Place Stat-
o-seal on screw and install screw onto end cap, snugging gently.
8. Install end cap onto cylinder body and secure with snap ring.
Revised: 3/31/94
LANDING GEAR AND BRAKE SYSTEM
2E6