Cleaning, Inspection And Repair Of Main Gear Oleo; Assembly Of Main Gear Oleo - Piper ARROW III Service Manual

7-21. CLEANING, INSPECTION AND REPAIR OF MAIN GEAR OLEO.

a. Clean all parts with a suitable dry type cleaning solvent.
b. Inspect the landing gear oleo assembly component for the following:
1. Bearings and bushings for excess wear, corrosion, scratches and overall damage.
2. Retaining pins for wear and damage.
3. Lock rings for cracks, burrs, etc.
4. Cylinder and orifice tube for corrosion, scratches, nicks and excess wear.
5. Orifice plate for hole restriction.
6. Fork tube for corrosion, scratches, nicks, dents and misalignment.
7. Air valve general condition.
c. Repair of the oleo is limited to smoothing out minor scratches, nicks and dents and replacement of
parts.
7-22. ASSEMBLY OF MAIN GEAR OLEO. (Refer to Figure 7-9.)
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-H-
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
locknut (6). Tighten locknut 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 locknut (6), torque nut 300 min. to 500 max. inch pounds.
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 7-73.
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 7-27) and gear operation.
o. Remove the airplane from jacks.
Revised: 2/13/89
* CHEROKEE ARROW III SERVICE MANUAL
LANDING GEAR AND BRAKE SYSTEM
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