Disassembly Of Nose Gear Oleo - Piper Cheyenne IIIA Airplane Maintenance Manual

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Nose Gear and Doors (continued)
10. Disassembly of Nose Gear Oleo (refer to 32-20-00 Figure 402)
The nose gear oleo assembly is removed and disassembled from the gear oleo housing with the
gear removed from or installed on the airplane.
(a) Place the airplane on jacks. (Refer to 7-10-00.)
(b) Place a drip pan under the nose gear to catch spillage.
(c) Remove air and fluid from the oleo. (Refer to Oleo Struts, 12-10-00.)
(d) To remove complete cylinder and fork assembly from the oleo housing, cut the safety wire and
remove cap bolts attaching the steering arm and aligner guide bracket to the top of the oleo
cylinder.
(e) Disconnect the shimmy dampener by removing the bolt assembly connecting the dampener to
the cylinder.
(f) Release and remove the retainer ring at the top of the housing. Pull the complete cylinder
assembly from the bottom of the housing. The upper and lower housing bushings must remain
pressed in the housing.
(g) To remove the piston tube assembly from the cylinder, separate upper and lower torque links
by removing the connecting bolt with washer, nut, and cotter pin. Note the spacer washer
between the two links.
(h) Compress the piston tube, reach up along the tube and release the snap ring from the annular
slot at the bottom of the oleo housing.
(i) Pull piston tube with component parts from cylinder.
(j) The piston tube components are removed by reaching in the tube and pushing out the upper
bearing retaining pins. Slide off the tube, the upper bearing, spacer, lower bearing with outer
and inner O-rings, wiper strip, washer, and retainer ring.
(k) To remove the orifice tube, remove the large bolt of the orifice tube and lock plate from top of
the cylinder. Pull the tube from the cylinder.
(I) The orifice place is removed from the bottom of the orifice tube by releasing the retainer ring
holding the plate in position.
NOTE: Do not remove the piston tube plug or O-ring of the piston tube from the fork.
11. Assembly of Nose Gear Oleo (refer to 32-20-00 Figure 402)
(a) Ensure parts are clean and inspected.
(b) To assemble orifice tube, insert orifice plate into the bottom of tube with countersunk side of the
orifice hole exposed. Secure the plate with the retainer ring. Lubricate and install the O-ring on
the upper end of tube.
(c) Insert tube up through bottom of cylinder. With the tube exposed through the top of the
cylinder, install orifice tube bolt finger tight.
(d) The piston tube assembly is assembled by installing the tube components on the tube. Slide
the retainer ring, washer, lower bearing with outer and inner seals, spacer, and upper bearing
onto tube. Align bearing retainer pin holes of the upper bearing and piston tube; install pins.
NOTE: Refer to parts catalog for correct part number when replacing O-rings and wiper strip.
(e) Lubricate inner wall of cylinder and carefully insert the piston tube assembly into the bottom of
the cylinder, allowing the orifice tube to guide itself into the piston tube, until the retainer ring
can be installed in the annular slot, at the end of the cylinder. Install the wiper strip and slide
the washer into position securing the assembly with the retainer ring.
EFFECTIVITY:
040-999
Jan 10/90
32 2000