The problem of getting heavy lubricant into a difficult location was a
typical automotive issue trying to get 90w hypoid oil into the differential
gear housing in the rear axle. The solution was effectively a big syringe.
It was a cylinder about 2" in diameter, a plunger and a flex nozzle. Stick
the nozzle into the oil, suck it up into the cylinder and then squirt it
into the rear gear box. They used to be available in supply houses catering
to the automotive repair business. Today that job is done from a central
reservoir and drop down hose and trigger nozzle. Consider something on the
turkey baster principle, as and alternative.
Date: Tue, 20 Jul 2010 18:55:42 -0500
From: "K0DAN" <email@example.com>
Subject: [TowerTalk] TRI-EX LM470 GEARBOX
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 couple of problems/questions for the group...
A) The fill plug is very inaccessible (blocked by the bottom of the
The best I've come up with is a funnel with piece of plastic tubing and
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
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?
does the gearbox shaft attached to the drum shaft? It appears to be
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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