Piper PA-34-200T Seneca II, Service Manual

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PIPER SENECA II SERVICE MANUAL
VII - LANDING GEAR AND BRAKE SYSTEM 04/30/07
1J8
CAUTION: WHEN IT BECOMES NECESSARY TO RAISE OR LOWER EITHER THE NOSE
GEAR OR THE MAIN GEAR MANUALLY, THE FREE-FALL VALVE KNOB SHOULD
BE PULLED FULL OUT THUS PREVENTING THE BUILDUP OF UNNECESSARY
PRESSURE ON THE ACTUATING CYLINDERS AND CONNECTING HYDRAULIC
LINES. FAILURE TO COMPLY WITH THESE INSTRUCTIONS COULD RESULT IN
THE BUILDUP OF SUFFICIENT PRESSURE TO UNLOCK THE DOWNLOCK
MECHANISM ALLOWING THE GEAR TO COLLAPSE WHEN THE WING JACKS
ARE REMOVED.
7-4. LANDING GEAR SYSTEM.
7-5. NOSE LANDING GEAR OLEO.
7-6. INSPECTION.
a. Clean all parts using a suitable dry type cleaning solvent.
b. Inspect components of the landing gear as follows:
1. Bearings and bushings for excessive wear, corrosion, scratches and overall condition.
2. Retaining pins for wear.
3. Lock rings for cracks, nicks, burrs and overall condition.
4. Cylinder and piston strut for excessive wear, corrosion, scratches and nicks.
5. Orifice hole for obstruction.
6. Fork for misalignment,cracks or other damage.
7. Air valve for general condition.
7-7. DISASSEMBLY. (Refer to Figure 7-1.) The nose gear oleo assembly may be removed and disassembled
from the trunnion assembly with the gear removed from or installed in the airplane.
NOTE Prior to proceeding with instructions contained in this section, the airplane must be placed on
jacks. (Refer to Jacking, Section II.)
a. With the airplane mounted on jacks, place a drip pan under the nose gear to catch spillage.
b. Remove air and fluid from the oleo strut assembly. Depress the air valve core pin until strut pressure
is released. Remove the air valve body (15) and, using a thin hose, siphon as much hydraulic fluid
from the strut as possible.
c. To remove oleo cylinder (26), piston strut (30) and fork (39) from the trunnion assembly (23), cut
safety wire (2) and remove four bolts and washers (1) securing the tiller (20) to the top of the oleo
cylinder.
d. Disconnect nose gear centering spring assembly (11) by removing attaching hardware connecting
the spring assembly to the strut housing.
e. Remove oleo cylinder and fork assembly (39) from the trunnion assembly.The upper and lower
shoulder bushings (17 and 22) should remain pressed in the trunnion.
f. To remove the piston strut (30) and fork (39) from the oleo cylinder, first separate upper and lower
torque links (33) and remove snap ring (37) from the bottom of the oleo cylinder.
g. Pull the piston strut with components from the cylinder. Remove two pins (28) and slide
components from cylinder.