Piper COMANCHE PA-24-180 Service Manual page 194

PIPER COMANCHE SERVICE MANUAL
NOTE
The shimmy dampener is the collar to which the top of the scissor
and bushing assembly and the lower end of the steering shaft is
fastened. This collar is composed of two halves. It has a split friction
lining between the collar and gear casting and utilizes washers as
space adjustments between the halves of the collar.
CAUTION
Do not lubricate the collar and shoe assembly.
p.
Remove the airplane from jacks.
6-9. Disassembly of Nose Gear Oleo. (PA-24-180 and PA-24-250, Serial Nos. 24-215 and up; PA-24-260 and
PA-24-400.) (Refer to Figure 6-2.) 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.
a.
Place the airplane on jacks. (Refer to Jacking, Section II.)
b.
Place a drip pan under the nose gear to catch spillage.
c.
Remove air and fluid from the oleo strut. Depress the air valve core pin (8) until strut chamber
nressure has diminished, remove the filler plug (21) and with a small hose siphon as much hydraulic fluid from
the strut as possible.
d.
To remove the complete cylinder and fork assembly from the oleo housing (10), cut the safety wire
(6) at the top of the unit and remove the cap bolts (7) that attach the steering arm (28) and aligner guide bracket
(18) to the top of the oleo cylinder (33).
e.
Disconnect the shimmy dampener (13) by removing each cotter pin, nut, washer and bolt that
connects the dampener to the oleo cylinder and housing.
f.
Release and remove the snap ring (19) at the top of the housing(10) and pull the complete cyWder
(33) and fork assembly (17) from the bottom of the housing. The upper and lower housing bushings (20 2)
should remain pressed in the housing.
g.
To remove the piston tube (35) and fork (17) from the cylinder (33), first separate the upper and
lower torque links (4 and I) by removing the link connecting bolt assembly (3) and then separate the two links.
Note the upper and lower torque links and the number of spacer washers (2) between the two links.
h.
Compress the piston tube (35), reach up along the tube and release the snap ring (49) from the
annular slot at the bottom of the oleo housing.
i.
Pull the piston tube (35) with component parts from the cylinder.
j.
The piston tube components may be removed by reaching in the tube and pushing out the upper
bearing retainer pins (42). Slide from the tube, the upper bearing (43), lower bearing (44) with inner and outer
"O" rings (45 and 46), wiper strip (47), washer (48) and snap ring (49).
k.
To remove the orifice tube (34), remove the large locknut (22) and lock washer (24) from the top of
the cylinder. Pull the tube from the cylinder.
I.
The orifice plate (40) is removed from the bottom of the orifice tube by releasing the snap ring (4 1)
that holds the plate in position. Expand and remove the ring (39) (PA-24-400 only) from the lower end of the
tube.
LANDING GEAR AND BRAKE SYSTEM
REVISED: 4/10/81
112