I'm doing maintenance on my 1980's vintage Tri-Ex LM470D which I've had up
at this QTH since about 1999.
It has the original a Hub City gearbox, which leaks oil. The gearbox has
never caused me trouble, but it seems like having oil in it is better than a
A couple of problems/questions for the group...
A) The fill plug is very inaccessible (blocked by the bottom of the motor).
The best I've come up with is a funnel with piece of plastic tubing and try
to drip oil into the gearbox. 80 weight or higher weight gear oil is just
too thick to run thru the curves in the plastic tubing. Even regular motor
oil doesn't make it, and the small opening of the fill plug makes it hard
for air to "burp" out of the housing. Result: lots of spilled oil and no way
to tell how much oil ever got into the housing! Any tricks on how fill the
B) Has anyone replaced the gearbox seals? Is there a way to replace the
gearbox seals without complete removal from the drum and mounting frame? How
does the gearbox shaft attached to the drum shaft? It appears to be welded,
but I doubt this is the case...there must be a key on the shaft, however
there are no obvious set screws, keys, or other means of coupling. Looks
like complete removal could be a big job with collateral damage.
I can send some photos if my text doesn't make sense....anyone been down
this road before? Any ideas greatly appreciated!
Tnx es 73
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