Cleaning Of Main Landing Gear; Disassembly Of Main Gear Oleo - Piper Cheyenne IIIA Airplane Maintenance Manual

PIPER AIRCR AFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Main Gear and Doors (continued)
7. Cleaning of Main Landing Gear
(a) Clean all parts with a suitable cleaning solvent.
(b) If lock hook springs are corroded [refer to Inspection of Main Landing Gear, step (d)(1.)], clean
all corrosion and repaint the springs.
8. Repair of Main Landing Gear
Repair of the landing gear is limited to replacing bearings and bushings, smoothing out minor nicks
and scratches, repainting areas where paint has chipped or peeled, and replacement of parts.
9. Disassembly of Main Gear Oleo (referto 32-10-00 Figure 402)
The main gear oleo assembly is removed and disassembled from the gear oleo housing with the
gear removed or installed on the airplane as follows:
(a) Place airplane on jacks. (Refer to Jacking, 7-10-00.)
(b) Place a drip pan under main gear to catch spillage.
(c) Remove air and fluid from oleo. (Refer to Oleo Struts.)
(d) To remove piston tube assembly from oleo housing, remove upper and lower torque link
connecting bolt assembly and separate links. Note number and thickness of spacer washers
between two links.
(e) Compress piston tube, reach up along the tube, and release the retainer ring from the annular
slot at the bottom of oleo housing.
(f) Pull piston tube with component parts from housing cylinder.
(g) The fork tube components are removed by reaching in the tube and pushing out the upper
bearing retaining pins. Slide off the upper bearing, spacer, lower bearing with O-rings or
dynamic seal and wiper, washer, and retainer ring.
(h) To remove orifice tube from the oleo housing, cut safety wire and remove cap bolt and washer
from top of housing.
(i) The orifice plate is removed from the orifice tube by releasing the retainer ring holding the plate
in position.
10. Assembly of Main Gear Oleo (refer to 32-10-00 Figure 402)
(a) Ensure all parts are cleaned and inspected.
(b) To assemble and install the orifice tube, insert orifice plate into the bottom of the tube, with
countersunk side of the orifice hole exposed. Secure plate with retainer ring. Lubricate and
install O-ring on the upper end of the tube and insert tube up through the bottom oleo housing.
(c) The piston tube assembly is assembled to the oleo housing by installing tube components on
the tube. Slide the retainer ring, washer, lower bearing with inner and outer O-rings, spacer,
and upper bearing onto the tube. Align lockpin holes of the upper bearing and tube; install
retainer pins.
NOTE: Refer to parts catalog for correct part number when replacing O-rings and wiper strip.
EFFECTIVITY:
040-999
PAG
10/90
32-10-00
Jan 10/90