Main Gear Oleo Cleaning, Inspection And Repair; Main Gear Oleo Assembly - Piper PA-24 Comanche Service Manual

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PIPER COMANCHE SERVICE MANUAL
e. Compress the piston Nbc (8), reach up alOnt the Nbc and rele:uc the snap
riDf
(29) from the
annular slot
at
the bottom of the oleo housinc.
f. Pull the fllston Nbc with component puts from the
~lindct
hOusiDJ.
g. The piston tube componentS may be removed by reaching in the Nbe and pushinJ Out the upper
bearins retainer pins (23), Slide off the upper bcui.r11
(12),
lower bearin, (Z4) with
"0" tinas (25 alid 26),
wiper (27). washer (28) and snap riftl (29).
h. To remove the orifice tube (19) from the oleo bouu•. remove the locknut (12) and wuhcr (13)
from the
tO~
of the housinl. Draw the tube with back·up
riDa
(1.), "0"
Me
(15)
and
rinI
(16)
(PA-24-400
only) from the housing.
I.
The orifice plate (17) is removed &om the bottom of the orifice cubc (19) by releasing the snap
rin, (18) that holds the plate in position, Expand lnd remove the riq (16) from the lower eDdof the Nbe.
j. To remove the piston tube plug (21) with "0"
nn,
(20) located in the lower end of the piston
tube
(8), remove the bolt assembly (9) and insert a rod up throuF the hole
in
the body of the fork
(1),
pushing the plul out through the tOP of the rube,
6-29.
C1cuainl.
Inspection And R.epair Of MaiD Gar Olco.
a. Clean all parts with a suiuble
dry
tYpe
c1a.aiD1
solvent.
b. Inspect the landinl,ear oleo assembly component for tbc'foUowing,
1.
Scarinp and bushinp for excess wear, corrosion, scratches and overall damage,
2. Rcu.inina pins for
WClt
and damqc.
3. Lock rinp for cracks, burrs, etc,
4-.
Cylinder and orifice Nbc for corrosion. sc:ntches, nicks and excess wear.
5. Orifice plate for bole t'Csmcnon.
6. Fork. tubc for corrosion. scratches, nicks. dena and miJalipment.
7. Air valve Jencra1 cOlldinon.
c. Repair of the oleo is limited to smoothilll out minor scratehes. nicks and denu and replacement
of
parts.
d. Individual replacement of wiper strips may be accomplished per instructions Jiven in parqraph
640.
6-30. Auembly Of Main Gar Oleo. (Refer to Figure
6~.)
a.
Ascertain that all pans are cleaned and inspected.
b. To install the piston tube plul (21), fust lubricate the plug "0" rint CZO) with hydraulic
fl~id
(MIL-H-5606) and instal! it on the plug. Lubricate the inside wall of the piston tube (8). Insert the pl\&l,into
the tOp
ot
the tube and push it to the fork end.
AllIn
the bolt bola of the fork, tube and pllJl' and install
bolt
assembly (9).
(If
a new Nbe (8) is installed that
bas
not been cirilled. press the tube into the fork
ho~sing
until it bottoms. Using the fork bolt holes u a
pidc.
drill a pilot hole and ream to 0.250/0.252
thro~gh
each side of the tIIbe wall. Remove bum &om the inside of tbe rube and flush the tube with a
suitable solvent to remove all mccal particles.
c. If desired. cement a cork in the hole in the bottom of the fork body to prevent dirt from entering
between the fork and tube.
d. To assemble the compcneau of the orifice
tube (
19), insert the orifice plate ( 17) into the bottom
ot
the tube and secure with snap ring (18). Insull ring (16) (PA-24-1-OO only) on the lower end of the tube.
e. To install the orifice tube in the oleo housiftl (7). insert the Nbe up through the
ho~sing.
With the
end of the tube exposed through the top of the housinl. install the "0" ring (15), back-up ring (140), washer
(13), and locknut (12). TiJhten locknut only iinSCf tiJht at this nme.
LANDING GEAR AND BRAKE SYSTEM
ISSUED: 8/18172
1117