PIPER AIRCRAFT, INC.
PA-28-161, WARRIOR III
MAINTENANCE MANUAL
PAGE 7
Nov 30/06
1I3
12-10-00
(5) Fill the main gear housing by one or two methods which are as follows:
(a) Method I:
1 Remove valve core from filler plug at top of strut housing. Do not remove plug.
2
Attach one end of a clear plastic hose to valve stem of filler plug and submerge the
other end in a container of hydraulic fluid.
3
Fully compress and extend strut (10 +2, -0 inches of strut tube exposed) to draw fluid
into the strut. By watching fluid pass through plastic hose, determine when the strut
is full and no air is present. Strut must be extended to the full ten (10) inches to allow
fluid to enter bottom chamber of strut housing.
4 When air bubbles cease to flow through hose, compress strut fully and remove hose
from valve stem.
5 With strut fully compressed, remove filler plug to determine that fluid level is visible
up to bottom of filler plug hole.
6 Install core in filler plug. Apply an appropriate thread lubricant to threads of filler plug
and install plug in the top of strut housing. Torque plug to 350 450 inch-pounds.
(b) Method II:
1 Remove the filler plug from the top of the strut housing.
2 Raise the strut to full compression.
3
Pour fluid from a clean container through the filler opening until it is visible at the top
of the strut chamber. If housing has been completely emptied or nearly so, allow
enough time for fluid to drain through the orifice from upper chamber into middle
chamber.
4
Lower gear until wheel touches the ground (10 +2, -0 inches strut exposure). Fully
compress and extend strut three or four times to remove any trapped air, and for fluid
to enter bottom chamber of housing.
5 Raise strut to full compression and fill with fluid to bottom of filler plug.
6 Apply an appropriate thread lubricant to filler plug threads. Install filler plug and
tighten to a torque of 350 - 400 inch-pounds.
(6) Replace torque link bolt. Tighten bolt only enough to allow no side play in the connection.
(7) With airplane raised, retract and extend gear strut several times to ascertain that the strut
actuates freely. The weight of gear fork and wheel should extend strut.
(8) Clean off overflow of fluid and inflate strut as described in Inflating Oleo Struts.
(9) Check that fluid is not leaking around the strut piston at the bottom of the housing.
D. Inflating Oleo Struts
NOTE: If possible use nitrogen to inflate oleo struts instead of air. Nitrogen will reduce the chance of
rust forming inside the strut.
Make certain that oleo strut has sufficient fluid and that torque link is properly connected. Attach a strut
pump to air valve and inflate oleo strut to proper visible piston extension, or a pressure of 150 + 15 psi.
When using pressure method pistons must be fully extended by raising aircraft off ground. (See 7-10-00.)
When using the extension method, the aircraft should be fully serviced with fuel and engine oil and
resting on its landing gear. Inflate strut until correct inches of piston is exposed. Rock aircraft several
times to ascertain that gear settles back to the correct strut position. If a strut pump is not available,
raise aircraft and use line pressure from a high pressure air system. Lower aircraft and, while
rocking it, bring strut down to proper extension by releasing air from valve.
Check for valve core leakage before capping valve.
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