most probably cause of a gear crank handle to transmission body leak is
overfilling of the transmission. The transmission should be filled with
the specified gear lube just to the point of the base of the worm gear
of the crank picking up gear lube. A simple solution to finding an
overfilled transmission could be a turkey baster with a piece of vinyl
tubing on the end of it to extract the excess.
HERE is a link to a gear lube discussion for the motor and the transmission.
sometimes, the decades old 1940's technology nitrile rubber o-rings are
the cause which may have been in service since the airplane came from
Here is a solution posted by Beech Lister
O. for his leaking Gear Crank Handle:
safety wire remove three screws place rag under assembly to catch any dripping
oil tap on assembly to break it lose from gear box place small rag in hole where
handle came off--this keeps oil from draining out remove screw from handle slip
shaft out from other side remove O-ring (AN6227-9)
clean all parts and
inspect shaft for damage on end. Also, before removing the crank handle housing,
match mark one ear so that you put it back exactly in the same orientation as it
came off. This assumes that it has been correctly installed previously. Note the
slight cant upward of this handle
is a picture of the
for the O-ring
do NOT scar it getting the old O-ring out. After cleaning all
the parts, slip in a new O-ring, AN6227-9 or MS28775-111, using a small wooden dowel to help in
placement replace the washer and spring, lube shaft and slowly insert into housing.
3. Place shims on shaft while pushing in on shaft--place handle and insert screw
4. Place some RTV around housing face that fits to gear box
handle assembly onto gear box--making sure that it is pointed upwards--NOT down
(this is why you match marked it at the beginning).
5. Replace screws and safety wire all three -- note the slight upward angle of the handle
in the above photo on the left.
6. Test to make sure the handle engages the gear box properly then place cover back on
sure the handle is not caught under the cover.
7. You may want to consider leveling the aircraft to
insure that your oil level in the transmission is properly filled. Place a
cookie tray or rags under the handle area to catch any overfill that may be in
the transmission housing.
An easy fix to a dirty problem!
PS: Keep the below picture in mind
before engaging your Master Power Switch and ALWAYS check for proper stowage of
the crank handle and admonish passengers riding in the back of the importance of
NOT disturbing that crank handle.
A Velcro strap or bootie cover is an ideal solution!