4. There are two methods used to fill the strut chamber. These are as follows:
a. Method I.
(1) Remove valve core from filler plug at top of strut housing. Allow plug to remain installed.
(2) Attach one end of clear plastic hose to valve stem of filler plug and submerge other end in a
container of hydraulic fluid. Check that end of hose on valve stem is tight and fluid container
is approximately equal in height to top of strut housing.
(3) Fully compress and extend strut, drawing fluid from fluid container and expelling air from
strut chamber.
(4) When air bubbles cease to flow through hose, compress strut fully and remove hose from
valve stem.
(5) With strut compressed, remove filler plug to determine that fluid level is visible up to bottom
of filler plug hole.
(6) Install core in filler plug and apply thread lubricant (Parker #6PB) to threads of filler plug.
Install plug in top of strut housing. Tighten plug to a torque of 350 to 400 inch-pounds.
b. Method II.
(1) Remove filler plug from top of strut housing.
(2) Raise strut piston until fully compressed.
(3) Pour fluid from a clean container through filler opening until it reaches bottom of filler plug
hole.
(4) Install filler plug finger tight. Extend and compress strut two or three time to remove any air
that may be trapped in housing.
(5) Remove filler plug. Raise strut to full compression and fill with fluid if needed.
(6) Apply thread lubricant (Parker #6PB) to threads of filler plug. Reinstall filler plug and tighten
to a torque of 350 to 400 inch-pounds.
5. With airplane raised, compress and extend gear strut several times to ensure that strut moves freely.
—NOTE—
The weight of gear fork and wheel should extend strut.
6. Clean off overflow of fluid. Inflate strut as described in Inflating Oleo Struts.
7. Check that fluid is not leaking from around strut piston at bottom of housing.
FILLING MAIN GEAR OLEO STRUT
Fill main gear oleo strut with MIL-H-5606 fluid as follows:
1. Raise airplane on jacks until landing gear torque link assembly has almost reached its full travel.
(Refer to chapter 7.)
2. Place a pan under gear to catch spillage.
3. Remove cap on top of wing if not previously accomplished to gain access to top of strut housing.
Remove cap from air valve and depress valve core to relieve air from strut housing chamber.
12 - 22 - 00
Page - 12 - 08
Reissued: August 1, 1986
1D4
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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