Nose Gear Oleo Assembly - Piper PA-24 Comanche Service Manual

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PIPER
COMANCHE SERVICE MANUAL
c. Repair of the housing is limited to smoothing out minor scratches. nicks and dents and replacement
of parts.
d. Individual replacement of the wiper strip may be accomplished per instructions given in paragraph
6·40.
6~8.
Assembly or Nose Gear Oleo. (PA-24-180 and PA-24·250. Serial Nos. 24-1 to 24-214 inclusive.) (Refer to
Figure 6-1.)
a. Ascertain that parts are cleaned and inspected.
b. To install the piston tube plug (32), first lubricate the tube plug and
"0"
ring (33) with hydraulic
fluid
(M
IL-H-5606), and install the
"0"
ring on the plug. Lubricate the inside wall of the piston tube (12). insert
the plug into the top of the tube and push it to the fork end. Align the bolt holes ofthe fork (18). tube and plug.
and install bolt (CT) (16) with washers and nut. (If a new tube (12) is to
be
installed that has not been drilled.
press the tube into the fork piston housing( 18) until it bottoms. Using the bolt holes in the fork body as a guide.
drill a pilot hole and ream to 0.250 0.252 through each side of the tube wall. Remove burrs from the inside of
the tube and flush the tube with a suitable solvent to remove all metal
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 components of the orifice tube (21), insert the orifice plate (22) into the bottom of
the tube and secure with snap ring (23). Lubricate and install"O" ring (20) and back-up washer (19) on the
upper end of the tube.
e. I
nsert
the orifice tube (21) in the oleo housing (3). Wjth the end ofthe tube exposed through the top
of the housing. install washer (2) and locknut (l). Tighten locknut only finger tight at this time.
f. Assemble the components of the piston tube (
12)
on the tube by placing. in order. the snap ring (31).
washer (30). lower bearing (27). with inner and outer
"0"
rings (34 and 28), spacer (26) and upper bearing(25).
Align the lock pin hole of the upper bearing with the pin holes in the piston tube and install pins (24).
g. Lubricate the inner wall of the housing (3) and tube ( 12). Carefully insert the tube assem bly into the
housing. guiding the orifice tube (21) into the piston tube until the snap ring (31) can be installed in the annular
slot at the lower end of the housing.
h. At the top of the housing. tighten the orifice
tube
locknut (I).
I.
At the bottom of the housing, install wiper strip (29). slide washer (30) into position and secure
assembly with snap ring (31).
j.
Ascertain that the bushings are installed in the upper and lower torque links (13 and 15) and then
install the links.
NOTE
Ascertain that the torque links are properly installed to insure
complete travel of the piston tube and fork assembly within the oleo
housing.
The torque link bolt assemblies should be lubricated and installed with the flat ofthe bolt head hex adjacent to
the milled stop of the wide end of the link. (Use the same thickness of spacer washer between the two links as
that removed to maintain correct wheel alignment.) Tighten the bolts only light enough to allow no side play in
the links. yet be free enough to rotate. Safety nuts with cotter pins.
k.
Lubricate the gear assembly. (Refer to lubrication Chart. Section
11.)
I. Compress and extend the strut several times to ascertain that the strut will operate freely and torque
links do not restrict travel in the compressed position. The weight of the gear wheel and fork should allow the
strut to extend.
m. Service the oleo strut with fluid and air. (Refer to Oleo Struts. Section II.)
n. Check the nose gear alignment (refer to paragraph 6-16) and gear operation.
o. Adjust the shimmy dampener collar by means of its washers to give a good firm fit.
If
the collar is too
tight. the result will be hard steering and. if too loose. nose wheel shimmy will be present. It may be necessary.
at times.
to
try several combinations or thicknesses of washers to get the proper result.
LANDING GEAR AND BRAKE
SYSTEM
REVISED: 4/10/81
111