Nose Gear Oleo Disassembly; Nose Gear Oleo Cleaning, Inspection And Repair - Piper PA-44-180 SEMINOLE Maintenance Manual

NOSE GEAR.
NOSE GEAR OLEO.
DISASSEMBLY OF NOSE GEAR OLEO. (Refer to Figure 32-5.)
The nose gear oleo assembly may be removed and disassembled from the gear oleo housing with the gear
removed from or installed on the airplane.
1. Place the airplane on jacks. (Refer to Chapter 7.)
2. Place a drip pan under the nose gear to catch spillage.
3. Remove air and fluid from the oleo strut. Depress the air valve core pin until strut chamber pressure has
diminished, remove the filler plug and with a small hose siphon as much hydraulic fluid from the strut as
possible.
4. To remove the complete cylinder and fork assembly from the oleo housing, cut safety wire at the top of the
unit and remove cap bolts that attach steering arm and aligner guide bracket to the top of the oleo cylinder.
5. Disconnect the shimmy dampener by removing each cotter pin, nut, washer and bolt that connects the
dampner to the oleo cylinder and housing.
6. Release and remove the snap ring and washer(s), if installed, at the top of the housing, and pull the complete
cylinder and fork assembly from the bottom of the housing. The upper and lower housing bushings should
remain pressed in the housing.
7. To remove the piston tube and fork from the cylinder, first separate the upper and lower torque links by
removing the link connecting bolt assembly and then separate the two links. Note spacer washer between
the two links.
8. 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.
9. Pull the piston tube with components parts from the cylinder.
10. The piston tube components may be removed by reaching in the tube and pushing out the upper bearing
retainer pins. Slide from the tube, the upper bearing, lower bearing with outer and inner "O" rings, wiper
strip, washer and snap ring.
11. To remove the orifice tube, remove the large lock nut and lock washer from the top of the cylinder. Pull the
tube from the cylinder.
12. The orifice plate is removed from the bottom of the orifice tube by releasing the snap ring that holds the
parts in position.
13. To remove the piston tube plug with"O" ring, located in the lower end of the tube, remove the bolt assembly
and insert a rod up through the hole in the body of the fork. Push the plug out through the top of the tube.
CLEANING, INSPECTION AND REPAIR OF NOSE GEAR OLEO.
1. Clean all parts with a suitable dry type cleaning solvent.
2. Inspect the landing gear oleo assembly component for the following:
A. Bearings and bushings for excess wear, corrosion, scratches and overall damage.
B. Retaining pins for wear and damage.
C. Lock rings for cracks, burrs, etc.
D. Cylinder and orifice tube for corrosion, scratches, nicks and excess wear.
E. Upper and lower cylinder bushings loose or turning in cylinder.
F. Orifice plate for hole restriction.
G. Fork tube for corrosion, scratches, nicks, dents and misalignment.
H. Air valve general condition.
3. Repair of the oleo is limited to smoothing out minor scratches, nicks and dents and replacement of parts.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
2G14
3 2 - 2 1 - 0 2
Page 32-22
Revised: May 15, 1989