Piper Aircraft Corporation Cherokee 140 PA-28-140, Service Manual

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PIPER CHEROKEE SERVICE MANUAL
01/31/08 VIIA - LANDING GEAR AND BRAKE SYSTEM
(PA-28R)
2H23
7A-22. ASSEMBLY OF MAIN GEAR OLEO. (Refer to Figure 7A-8.)
a. Ascertain that all parts are cleaned and inspected.
b. To install the piston tube plug (26), first lubricate the plug “O” ring (27) with hydraulic fluid (MIL-
PRF-5606) and install it on the plug. Lubricate the inside wall of the tube. Insert the plug into the
top of the tube (25) and push it to the fork end. Align the bolt holes of the fork, tube and plug, and
install bolt assembly.
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 (12) insert the orifice plate (13) into the bottom of
the tube and secure with snap ring (14).
e. To install the tube (12) in the oleo housing (11), insert the tube up through the housing. With the
end of the tube exposed through the top of the housing, install the “O” ring (9), retainer (8), washer
(7), and lock nut (6). Tighten lock nut only finger tight at this time.
f. Assemble the components of the piston tube (25) on the tube by placing, in order, the snap ring
(24), washer (23), lower bearing (20) with outer and inner “O” rings (19 and 21) and upper bearing
(18). Align the two .125 diameter holes and the lock pin holes with the corresponding holes in the
piston tube (25) and install pins (17) without force. The outer surface of the pins must not protrude
beyond the outer diameter of the bearing (18).
g. Lubricate the wall of the cylinder oleo housing (11) and tube (25), and carefully insert the tube
assembly into the housing, guiding the orifice tube (12) into the piston tube until the snap ring (24)
can be installed in the annular slot at the lower end of the housing. Install the wiper strip (22); slide
the washer (23) into position and secure the assembly with snap ring (24).
h. At the top of the housing, tighten the lock nut (6).
i. Ascertain that the bushings are installed in the upper and lower torque links (15 and 16) and then
install links. The torque link bolt assemblies (2, 3 and 4) should be lubricated and installed with the
flat of the bolt head hex adjacent to the milled stop of the wide end of the link. (Use the same
thickness of spacer washers between the two links as those removed to maintain correct wheel
alignment.) Tighten the bolts only tight enough to allow no side play in the links, yet be free enough
to rotate.
j. Connect the brake line and bleed the brakes per paragraph 7A-73.
k. Lubricate the gear assembly. (Refer to Lubrication Chart, Section II.)
l. Compress and extend the strut several times to ascertain that the strut will operate freely. 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 main gear alignment (refer to paragraph 7A-27) and gear operation.
o. Remove the airplane from jacks.